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Interrupt List, part 11 of 18
Copyright (c) 1989-1999,2000 Ralf Brown
--------D-26---------------------------------
INT 26 - DOS 1+ - ABSOLUTE DISK WRITE (except partitions > 32M)
AL = drive number (00h = A:, 01h = B:, etc)
CX = number of sectors to write (not FFFFh)
DX = starting logical sector number (0000h - highest sector on drive)
DS:BX -> data to write
Return: CF clear if successful
CF set on error
AH = status (see #02547)
AL = error code (same as passed to INT 24 in DI)
AX = 0207h if more than 64K sectors on drive -- use new-style call
may destroy all other registers except segment registers
Notes: original flags are left on stack, and must be popped by caller
this call bypasses the DOS filesystem, though DOS 5+ invalidates any
disk buffers referencing sectors which are written with this call
examination of CPWIN386.CPL indicates that if this call fails with
error 0408h on an old-style (<32M) call, one should retry the
call with the high bit of the drive number in AL set
Novell DOS 7 decides whether the old-style or new-style (>32M) version
of INT 26 must be used solely on the basis of the partition's size,
thus forcing use of the new-style call even for data in the first
32M of the partition
Windows98 will display an error message and deliberately hang the
system on attempted write to any hard disk if neither bit 7 of the
Extended Drive Info byte nor bit 6 of "DOS_FLAG" (List-of-Lists+60h)
is set
Although all registers except segment registers may be destroyed
some software depends on some of the registers being preserved.
For example some Flash disk drivers requires that DX is not trashed.
DR-DOS 7.03 takes care of this.
BUGS: DOS 3.1 through 3.3 set the word at ES:[BP+1Eh] to FFFFh if AL is an
invalid drive number
DR DOS 3.41 will return with a jump instead of RETF, leaving the
wrong number of bytes on the stack; use the huge-partition version
(INT 26/CX=FFFFh) for all partition sizes under DR DOS 3.41
DR DOS 6.0 original releases 05/1991 & 08/1991 reported wrong error
codes for "drive not ready" and "write protect". This was fixed
with the DR DOS BDOS patch "PAT321" (1992/02/19, XDIR /C: 947Bh)
and later "full" rebuilds (see INT21/AX=4452h for details).
SeeAlso: INT 13/AH=03h,INT 25,INT 26/CX=FFFFh,INT 21/AX=7305h,INT 21/AH=91h"PTS"
--------D-26----CXFFFF-----------------------
INT 26 - DOS 3.31+ - ABSOLUTE DISK WRITE (32M-2047M hard-disk partition)
CX = FFFFh
AL = drive number (0=A, 1=B, etc)
DS:BX -> disk write packet (see #02552)
Return: CF clear if successful
CF set on error
AH = status (see #02547)
AL = error code (same as passed to INT 24 in DI)
may destroy all other registers except segment registers
Notes: partition is potentially >32M (and requires this form of the call) if
bit 1 of the device attribute word in the device driver is set
original flags are left on stack, and must be removed by caller
this call bypasses the DOS filesystem, though DOS 5+ invalidates any
disk buffers referencing sectors which are written with this call
for FAT32 drives (which may be up to 2TB in size), use INT 21/AX=7305h
Windows98 will display an error message and deliberately hang the
system on attempted write to any hard disk if neither bit 7 of the
Extended Drive Info byte nor bit 6 of "DOS_FLAG" (List-of-Lists+60h)
is set
SeeAlso: INT 13/AH=03h,INT 25/CX=FFFFh,INT 26,INT 21/AX=7305h
Format of disk write packet:
Offset Size Description (Table 02552)
00h DWORD sector number
04h WORD number of sectors to read
06h DWORD transfer address
SeeAlso: #02548
--------G-26---------------------------------
INT 26 - COMTROL HOSTESS i/ISA DEBUGGER - ENTER/EXIT EXTENDED ADDRESSING MODE
???
Return: ???
SeeAlso: INT 23"COMTROL",INT 27"COMTROL"
--------D-27---------------------------------
INT 27 - DOS 1+ - TERMINATE AND STAY RESIDENT
DX = number of bytes to keep resident (max FFF0h)
CS = segment of PSP
Return: never
Notes: this is an obsolete call
INT 22, INT 23, and INT 24 are restored from the PSP
does not close any open files
the minimum number of bytes which will remain resident is 110h for
DOS 2.x and 60h for DOS 3.0+; there is no minimum for DOS 1.x, which
implements this service in COMMAND.COM rather than the DOS kernel
SeeAlso: INT 21/AH=31h
--------G-27---------------------------------
INT 27 - COMTROL HOSTESS i/ISA DEBUGGER - INVOKE REMOTE TURBO DEBUGGER KERNEL
???
Return: ???
Desc: invoke a copy of the remote Turbo Debugger kernel on the Hostess i
controller
SeeAlso: INT 20"COMTROL",INT 26"COMTROL"
--------D-28---------------------------------
INT 28 C - DOS 2+ - DOS IDLE INTERRUPT
SS:SP = top of MS-DOS stack for I/O functions
Return: all registers preserved
Desc: This interrupt is invoked each time one of the DOS character input
functions loops while waiting for input. Since a DOS call is in
progress even though DOS is actually idle during such input waits,
hooking this function is necessary to allow a TSR to perform DOS
calls while the foreground program is waiting for user input. The
INT 28h handler may invoke any INT 21h function except functions
00h through 0Ch.
Notes: under DOS 2.x, the critical error flag (the byte immediately after the
InDOS flag) must be set in order to call DOS functions 50h/51h from
the INT 28h handler without destroying the DOS stacks.
calls to INT 21/AH=3Fh,40h from within an INT 28 handler may not use a
handle which refers to CON
at the time of the call, the InDOS flag (see INT 21/AH=34h) is normally
set to 01h; if larger, DOS is truly busy and should not be reentered
the default handler is an IRET instruction
supported in OS/2 compatibility box
the _MS-DOS_Programmer's_Reference_ for DOS 5.0 incorrectly documents
this interrupt as superseded
the performance of NetWare Lite servers (and probably other peer-to-
peer networks) can be dramatically improved by calling INT 28
frequently from an application's idle loop
SeeAlso: INT 21/AH=34h,INT 2A/AH=84h,INT 2F/AX=1680h
--------U-289999-----------------------------
INT 28 u - PCXDUMP v9.00+ - INSTALLATION CHECK
AX = 9999h
Return: AX = AAAAh if installed
CX = version number * 100 (example: 03A2h = 930 = v9.30)
DL = interrupt used by the dump function (see #02553)
(00h if call not available)
BX = CS of PCXDUMP's INT 28 handler (undocumented)
ES = segment of PCXDUMP's memory block (v9.30, undocumented)
Program: PCXDUMP is a shareware screen grabber saving in PCX format
Notes: if DL<>00h a dump can be requested by calling INT DL as shown
below (the user can choose the interrupt number at installation
time); if DL=00h the dump function can be called only by hotkeys
(this is the default)
(Table 02553)
Call PCXDUMP screen-dump function with:
INT xx
AX = 1234h
BX = dump type
0000h Color dump
0001h Immediate color dump
0002h Black/White dump
0003h Immediate B/W dump
0004h Inverted B/W dump
0005h Gray scaled dump
0006h Inverted gray scaled dump
0007h Text screen dump to text file
0008h Text screen dump to ansi file
Return: nothing
Notes: if BX=0001h, 0003h, 0007h or 0008h the whole screen will be
dumped; the other valid values will draw a selection frame
on the screen except in text modes (text modes allow only
full screen dumps)
this function doesn't perform the dump, it only requests it;
the dump will be performed after a few milliseconds if it's
safe to do so, thus the author recommends putting a 60 ms delay
after this call
--------D-29---------------------------------
INT 29 C - DOS 2+ - FAST CONSOLE OUTPUT
AL = character to display
Return: nothing
BX may be destroyed by some versions of DOS 3.3
Notes: automatically called when writing to a device with bit 4 of its device
driver header set (see also INT 21/AH=52h)
COMMAND.COM v3.2 and v3.3 compare the INT 29 vector against the INT 20
vector and assume that ANSI.SYS is installed if the segment is larger
the default handler under DOS 2.x and 3.x simply calls INT 10/AH=0Eh
the default handler under DESQview 2.2 understands the <Esc>[2J
screen-clearing sequence, calls INT 10/AH=0Eh for all others
SeeAlso: INT 21/AH=52h,INT 2F/AX=0802h,INT 79"AVATAR.SYS"
--------U-29E60DCL0E-------------------------
INT 29 - ShowGFX - INSTALLATION CHECK
AX = E60Dh
CL = 0Eh
DX = C0DEh
Return: DX = DEC0h
Program: ShowGFX is a PCBoard graphics driver by Solar Designer
--------N-2A00-------------------------------
INT 2A - NETWORK - INSTALLATION CHECK
AH = 00h
Return: AH <> 00h if installed
CF set if NetWare v2.15 NetBIOS emulator installed
Note: supported by PC LAN Program, LAN Manager, LANtastic, NetWare, 10NET,
etc.
SeeAlso: INT 5C"NetBIOS"
--------N-2A0000-----------------------------
INT 2A - AT&T Starlan Extended NetBIOS (var length names) - INSTALLATION CHECK
AX = 0000h
Return: AH = DDh
SeeAlso: INT 5B"Extended NetBIOS"
--------N-2A01-------------------------------
INT 2A - NETWORK (Microsoft,LANtastic) - EXECUTE NETBIOS REQUEST,NO ERROR RETRY
AH = 01h
ES:BX -> NCB (see #03249 at INT 5C"NetBIOS")
Return: AL = NetBIOS error code
AH = status
00h no error
01h error occurred
SeeAlso: AH=04h,AX=0500h,INT 5B"Extended NetBIOS",INT 5C"NetBIOS"
--------N-2A02-------------------------------
INT 2A - NETWORK (Microsoft) - SET NET PRINTER MODE
AH = 02h
???
Return: ???
--------N-2A0300-----------------------------
INT 2A - NETWORK - CHECK DIRECT I/O
AX = 0300h
DS:SI -> ASCIZ device name (may be full path or only drive specifier--
must include the colon)
Return: CF clear if direct physical addressing (INT 13,INT 25) permissible
CF set if access via files only
Notes: do not use direct disk accesses if this function returns CF set or the
device is redirected (INT 21/AX=5F02h)
use AH=00h to determine whether the network is installed; if not,
direct physical access is allowed
may take some time to execute, so programs which need to check
frequently should save the result of the first call
this function is called by the DOS kernel on INT 25 and INT 26
supported by PC LAN Program, LAN Manage, LANtastic, NetWare, 10NET,
etc.
SeeAlso: INT 13/AH=02h,INT 13/AH=03h,INT 25,INT 26,INT 21/AX=5F02h
--------N-2A04-------------------------------
INT 2A - NETWORK - EXECUTE NetBIOS REQUEST
AH = 04h
AL = error retry
00h automatically retry request on errors 09h, 12h, and 21h
(see #03248 at INT 5C"NetBIOS")
01h no retry
02h ???
ES:BX -> Network Control Block (see #03249 at INT 5C"NetBIOS")
Return: AX = 0000h if successful
AH = 01h on error
AL = error code
Notes: invokes either INT 5B or INT 5C as appropriate
supported by PC LAN Program, LANtastic, LAN Manager, NetWare, 10NET,
etc.
NetWare 2.15 NetBIOS emulator returns CF clear if successful, CF set
on error
PC LAN Program defines any non-zero return value in AH as an error
indicator for subfunction 00h, and any non-zero return value in AX
as an error indicator for subfunction 01h
SeeAlso: AH=00h,AH=01h,AX=0500h,INT 5B"Extended NetBIOS",INT 5C"NetBIOS"
--------N-2A0500-----------------------------
INT 2A - NETWORK - GET NETWORK RESOURCE AVAILABILITY
AX = 0500h
Return: AX reserved
BX = number of network names available
CX = number of network control blocks available
DX = number of network sessions available
Notes: supported by PC LAN Program, LAN Manager, LANtastic, NetWare, 10NET,
etc.
the application should call this function before using any network
resources, and maintain its own count to avoid exceeding the
network's resource limits
SeeAlso: AH=00h,AH=01h,AH=04h,INT 5C"NetBIOS"
--------N-2A06-------------------------------
INT 2A - NETBIOS, LANtastic - NETWORK PRINT-STREAM CONTROL
AH = 06h
AL = function
01h set concatenation mode
all printer output put in one job until return to DOS prompt
02h set truncation mode (default)
printer open/close or BIOS/DOS output switch starts new job
03h flush printer output and start new print job
Return: CF set on error
AX = error code
CF clear if successful
Notes: subfunction 03h is equivalent to Ctrl/Alt/keypad-*
supported by PC LAN Program, LANtastic, NetWare, 10NET, etc.
LANtastic v4.x no longer supports this call
this function sets the printer mode for all redirected printers
SeeAlso: INT 21/AX=5D08h,INT 21/AX=5D09h,INT 2F/AX=1125h
--------N-2A07-------------------------------
INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
AH = 07h
???
Return: ???
Program: PC Network is an early networking package which was renamed the
IBM PC Local Area Network Program (PC LAN Program) as of v1.10
SeeAlso: AH=86h
--------N-2A2001-----------------------------
INT 2A - MS Networks or NETBIOS - ???
AX = 2001h
???
Return: ???
Note: intercepted by DESQview 2.x
--------N-2A2002-----------------------------
INT 2A - NETWORK - ???
AX = 2002h
???
Return: ???
Note: called by MS-DOS 3.30-6.00 APPEND
--------N-2A2003-----------------------------
INT 2A - NETWORK - ???
AX = 2003h
???
Return: ???
Note: called by MS-DOS 3.30-6.00 APPEND
--------N-2A4147DX0000-----------------------
INT 2A U - NetSoft DOS-NET v1.20+ - INSTALLATION CHECK
AX = 4147h ('AG')
DX = 0000h
Return: DX = 4147h if installed
DS:SI -> configuration data (see #02554)
Program: DOS-NET is a shareware networking package by Albert Graham
Note: this call is supported by CLIENT.COM, SERVER.COM, ROUTER.COM, and
NETDOS.COM
SeeAlso: INT 65/DX=4147h,INT 65/DX=4741h
Format of DOS-NET v1.20 configuration data area:
Offset Size Description (Table 02554)
00h BYTE ???
01h BYTE interrupt number used by DOS-NET APIs
02h WORD function number to place in AX for above interrupt
04h BYTE minor version as two BCD digits (e.g. 20h for v1.20)
05h BYTE major version number (01h for v1.20)
06h 2 BYTEs ???
08h WORD ??? (used by ARCNET.COM)
bit 15: ??? (set by MACTEST.COM)
0Ah WORD ??? (used by NDIS.COM and ODI.COM)
0Ch 22 BYTEs ???
24h DWORD -> ??? function (set by PROTECT.COM)
28h 12 BYTEs ???
34h DWORD -> ??? function (set by FASTVIEW.COM)
38h DWORD -> ??? function (set by FASTVIEW.COM)
58h DWORD -> ??? (offsets 04h and 1Ah from value are used by NETFILES)
???
7Ch WORD ???
7Eh WORD ??? (may be high half of a DWORD at 7Ch)
???
A8h DWORD -> ??? (used by SM.COM)
???
114h WORD ???
116h WORD ??? (may be high half of a DWORD at 114h)
???
1BDh BYTE ??? flags
bit 0: ???
bit 6: ???
???
1E1h BYTE ???
???
208h WORD ??? (used by SM.COM, MACTEST)
282h WORD ???
284h 2 BYTEs ???
286h WORD ??? flags
bit 0: ???
???
31Eh WORD ???
320h WORD ??? (used by NDIS.COM and ODI.COM)
322h 8 BYTEs ???
32Ah WORD ??? (used by NDIS.COM and ODI.COM)
???
33Eh 4 BYTEs ??? (used by ODI.COM)
342h N BYTEs ??? (used by NDIS.COM)
???
3CFh BYTE ??? flags
bit 2: ???
3D2h BYTE installed-component flags
bit 0: PROTECT installed
bit 1: NETCACHE installed
bit 3: SM.COM installed
bit 7: NETDEBUG installed
3D3h BYTE installed-component flags
bit 0: NETFILES installed
bit 6: FASTVIEW installed
???
3FFh BYTE ??? (used by NDIS.COM)
400h BYTE ???
401h BYTE ??? (used by SM.COM)
402h BYTE ??? (used by SM.COM)
???
448h BYTE ???
449h BYTE ??? (used by MACTEST)
44Ah BYTE ??? (used by PROTECT)
44Bh BYTE ???
44Ch BYTE ???
44Dh BYTE ??? (used by SM.COM)
44Eh BYTE ??? (used by SM.COM, MACTEST)
???
--------N-2A7802-----------------------------
INT 2A - NETWORK - PC LAN PROG v1.31+ - GET LOGGED ON USER NAME
AX = 7802h
ES:DI -> 8-byte buffer to be filled
Return: AL = 00h if no user logged on to Extended Services
AL <> 00h if user logged on to Extended Services
buffer at ES:DI filled with name, padded to 8 chars with blanks.
--------D-2A80-------------------------------
INT 2A CU - NETWORK - BEGIN DOS CRITICAL SECTION
AH = 80h
AL = critical section number (00h-0Fh) (see #02555)
Notes: normally hooked to avoid interrupting a critical section, rather than
called
the handler should ensure that none of the critical sections are
reentered, usually by suspending a task which attempts to reenter
an active critical section
the DOS kernel does not invoke critical sections 01h and 02h unless it
is patched. DOS 3.1+ contains a zero-terminated list of words
beginning at offset -11 from the Swappable Data Area
(see #01687 at INT 21/AX=5D06h); each word contains the offset within
the DOS data segment of a byte which must be changed from C3h (RET)
to 50h (PUSH AX) under DOS 3.x or from 00h to a nonzero value under
DOS 4.0+ to enable use of critical sections. For DOS 4.0+, all
words in this list point at the byte at offset 0D0Ch.
MS Windows patches the DOS kernel's calls to INT 2A/AH=80h-81h into
far calls to its own handler, and does not reflect the calls back
to INT 2A unless SYSTEM.INI contains ReflectDOSInt2A=1 or
ModifyDOSInt2A=0 in the [386Enh] section
Novell NETX does not issue INT 2A/AH=80h and INT 2A/AH=81h calls when
it intercepts INT 21 calls and processes them itself
SeeAlso: AH=81h,AH=82h,AX=8700h,INT 21/AX=5D06h,INT 21/AX=5D0Bh
(Table 02555)
Values for DOS critical section number:
01h DOS kernel, SHARE.EXE, DOSMGR
apparently for maintaining the integrity of DOS/SHARE/NET
data structures
02h DOS kernel, DOSMGR
ensures that no multitasking occurs while DOS is calling an
installable device driver
05h network redirector
06h DOS 4.x only IFSFUNC
08h ASSIGN.COM
0Ah MSCDEX, CORELCDX
0Fh IBM PC LAN server (while intercepting INT 10/AH=06h,07h,0Eh)
--------D-2A81-------------------------------
INT 2A CU - NETWORK - END DOS CRITICAL SECTION
AH = 81h
AL = critical section number (00h-0Fh) (see #02555)
Notes: normally hooked rather than called
the handler should reawaken any tasks which were suspended due to an
attempt to enter the specified critical section
MS Windows patches the DOS kernel's calls to INT 2A/AH=80h-81h into
far calls to its own handler, and does not reflect the calls back
to INT 2A unless SYSTEM.INI contains ReflectDOSInt2A=1 or
ModifyDOSInt2A=0 in the [386Enh] section
SeeAlso: AH=80h,AH=82h,AX=8700h
--------D-2A82-------------------------------
INT 2A CU - NETWORK - END DOS CRITICAL SECTIONS 0 THROUGH 7
AH = 82h
Notes: called by the INT 21h function dispatcher for function 0 and functions
greater than 0Ch except 59h, and on process termination
the handler should reawaken any tasks which were suspended due to an
attempt to enter one of the critical sections 0 through 7
SeeAlso: AH=81h
--------N-2A84-------------------------------
INT 2A CU - NETWORK - KEYBOARD BUSY LOOP
AH = 84h
Notes: similar to DOS's INT 28h, called from inside the DOS keyboard input
loop (i.e. INT 21/AH=07h or INT 21/AH=08h) to allow the network
software to process requests
Novell DOS 7+ calls this function with AX=8400h from inside of
the keyboard input loop.
SeeAlso: INT 28
--------N-2A86-------------------------------
INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
AH = 86h
???
Return: ???
SeeAlso: AH=07h,AH=C4h
--------P-2A8700-----------------------------
INT 2A CU - PRINT - BEGIN BACKGROUND PRINTING
AX = 8700h
CF clear
Return: CF clear if OK to print in background now
CF set if background printing not allowed at this time
Desc: used to inform interested programs that PRINT is about to start its
background processing, and allow those programs to postpone the
processing if necessary
Notes: when PRINT gains control and wants to begin printing, it calls this
function. If CF is clear on return, PRINT begins its background
processing, and calls AX=8701h when it is done. If CF is set on
return, PRINT will relinquish control immediately, and will not
call AX=8701h
PCVENUS (an early network shell by IBM and CMU) hooks this call to
prevent background printing while its own code is active
SeeAlso: AH=80h,AH=81h,AX=8701h
--------P-2A8701-----------------------------
INT 2A CU - PRINT - END BACKGROUND PRINTING
AX = 8701h
Desc: used to inform interested programs that PRINT has completed its
background processing
Note: called by PRINT after it has performed some background printing; not
called if AX=8700h returned with CF set.
SeeAlso: AX=8700h
--------N-2A89-------------------------------
INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
AH = 89h
AL = ??? (ASSIGN uses 08h)
???
Return: ???
--------I-2A90-------------------------------
INT 2A U - IBM PC 3270 EMULATION PROGRAM - ???
AH = 90h
???
Return: ???
Note: the LANtastic redirector and SERVER.EXE use this function with AL=01h,
03h-07h,0Ch-11h
--------N-2AC2-------------------------------
INT 2A U - Network - ???
AH = C2h
AL = subfunction
07h ???
08h ???
BX = 0001h
???
Return: ???
Note: this function is called by the DOS 3.30-6.00 APPEND
--------N-2AC4-------------------------------
INT 2A U - PC Network v1.00 - RECEIVER.COM - ???
AH = C4h
AL = subfunction
07h ???
08h ???
BX = ???
???
Return: ???
SeeAlso: AH=86h
--------N-2AD800-----------------------------
INT 2A U - Novell NetWare Lite - SERVER - DOS CRITICAL SECTION DISABLE
AX = D800h
Return: nothing
Desc: sets ??? flag, and sets ??? to initial value
Note: called by CLIENT for communication between client and server
SeeAlso: AX=D801h,AX=D850h
--------N-2AD801-----------------------------
INT 2A U - Novell NetWare Lite - SERVER - DOS CRITICAL SECTION ENABLE
AX = D801h
Return: nothing
Desc: clears the ??? flag set by AX=D800h
Note: called by CLIENT for communication between client and server
SeeAlso: AX=D800h,AX=D850h
--------N-2AD850-----------------------------
INT 2A U - Novell NetWare Lite - CLIENT - START SERVER CRITICAL SECTION
AX = D850h
Return: nothing
Desc: increments an internal byte-sized counter
Note: this function is intercepted by DV/X 1.10 PEERSERV.DVR and the
Advanced NetWare 4.0 DOS Requester
SeeAlso: AX=D851h
--------N-2AD851-----------------------------
INT 2A U - Novell NetWare Lite - CLIENT - END SERVER CRITICAL SECTION
AX = D851h
Return: nothing
Desc: resets an internal byte-sized counter to zero
Note: this function is intercepted by DV/X 1.10 PEERSERV.DVR and the
Advanced NetWare 4.0 DOS Requester
SeeAlso: AX=D850h
--------N-2AD852-----------------------------
INT 2A U - Novell NetWare - DOS Requester v1.03 - SERVER LOADED
AX = D852h
Return: ???
Note: calls the NetWare Lite SERVER installation check, and sets ??? pointer
SeeAlso: AX=D853h,INT 2F/AX=D880h
--------N-2AD853-----------------------------
INT 2A U - Novell NetWare - DOS Requester v1.03 - SERVER UNLOADED
AX = D853h
Return: ???
Note: clears the pointer set by AX=D852h
SeeAlso: AX=D852h
--------N-2AE0-------------------------------
INT 2A U - PC Network 1.00 - ???
AH = E0h
AL = subfunction??? (01h,02h, maybe others)
???
Return: ???
Note: called by PCNet 1.00 NET.COM, a shell program from which others are run
--------N-2AFF90-----------------------------
INT 2A - PC/TCP PREDIR.EXE - ???
AX = FF90h
Return: AX = ???
Note: PREDIR.EXE is the network printer redirector included as part of the
PC/TCP system by FTP Software, Inc.
--------N-2AFF91-----------------------------
INT 2A - PC/TCP PREDIR.EXE - ???
AX = FF91h
BX = ???
Return: AX = status???
--------N-2AFF92-----------------------------
INT 2A - PC/TCP PREDIR.EXE - INSTALLATION CHECK
AX = FF92h
Return: AX = 0000h if installed
BX = redirected printer port (FFFFh if no printers redirected)
CX = version (CH = major, CL = minor)
Note: PREDIR.EXE is the network printer redirector included as part of the
PC/TCP system by FTP Software, Inc.
--------N-2AFF93-----------------------------
INT 2A - PC/TCP PREDIR.EXE - ???
AX = FF93h
Return: AX = ???
--------N-2AFF94-----------------------------
INT 2A - PC/TCP PREDIR.EXE - ???
AX = FF94h
BX = ???
CX = ???
DX = ???
Return: AX = ???
Note: PREDIR.EXE is the network printer redirector included as part of the
PC/TCP system by FTP Software, Inc.
--------N-2AFF95-----------------------------
INT 2A - PC/TCP PREDIR.EXE - GET CONFIGURATION STRINGS
AX = FF95h
CX = what to get
0000h ??? (returned pointer to "C:\COMMAND.COM")
0001h spooling program
0002h ???
0003h spool file name
0004h swap file name
Return: AX = status
0000h successful
BX:DX -> ASCIZ configuration string
--------N-2AFF96-----------------------------
INT 2A - PC/TCP PREDIR.EXE - SET PRINT JOB TERMINATION CONFIGURATION
AX = FF96h
CX = what to set
0000h ???
0001h print-on-hotkey state
0002h print-on-exit state
0003h print job timeout in clock ticks
0004h print-on-EOF state
BX = new value (0000h disabled, 0001h enabled except for timeout)
Return: AX = ???
SeeAlso: AX=FF97h
Note: PREDIR.EXE is the network printer redirector included as part of the
PC/TCP system by FTP Software, Inc.
--------N-2AFF97-----------------------------
INT 2A - PC/TCP PREDIR.EXE - GET PRINT JOB TERMINATION CONFIGURATION
AX = FF97h
CX = what to get
0000h ???
0001h print-on-hotkey state
0002h print-on-exit state
0003h print job timeout in clock ticks
0004h print-on-EOF state
Return: AX = status
0000h successful
BX = old value (0000h disabled, 0001 enabled except for timeout)
SeeAlso: AX=FF96h
--------D-2B---------------------------------
INT 2B - DOS 2+ - RESERVED
Note: this vector is not used in MS-DOS versions <= 6.22, and points at an
IRET instruction
--------D-2B---------------------------------
INT 2B - IBM ROM-DOS v4.0 - ???
AH = function
00h ??? (modifies data in IBMBIO.COM)
01h internal operations
02h ???
AL = index (00h-0Ch)
Return: AX = ??? or (CMOS 2Dh and CMOS 2Eh)
03h get ??? data
Return: AX = (CMOS 2Dh and CMOS 2Eh)
BX = FFFFh
other does nothing
Note: function 03h is called by ROMSHELL.COM; if BX != 0, then the ES:DI from
INT 2F/AX=1982h points at valid data
SeeAlso: INT 2F/AX=1982h
--------D-2C---------------------------------
INT 2C - DOS 2+ - RESERVED
Note: this vector is not used in DOS versions <= 6.00, and points at an IRET
--------O-2C---------------------------------
INT 2C - STARLITE architecture - KERNEL API
Note: STARLITE is an architecture by General Software for a series of MS-DOS
compatible operating systems (OEM DOS, NETWORK DOS, and SMP DOS) to
be released in 1991. The interrupt number is subject to change
before the actual release.
--------m-2C---------------------------------
INT 2C R - Cloaking - CALL PROTECTED-MODE PASSALONG CHAIN
Notes: when this interrupt is invoked in V86 mode, RM386 will invoke the first
in a chain of protected-mode handlers, and will only pass execution
to the V86-mode INT 2C handler if none of the handlers in the
passalong chain handle the call instead. This is the method by which
the real-mode stub of a cloaked application communicates with the
protected-mode portion.
the cloaking host calls the passalong chain with EAX=58494E33h ('WIN3')
when MS Windows starts up and with EAX=334E4958h ('3NIW') when
Windows shuts down; between these two broadcasts, the additional
Windows-only Cloaking services are available
this function was first introduced with RM386 (RAM-MAN/386) v6.00, the
memory manager included in Helix Software's Netroom
SeeAlso: INT 2C/AX=0009h,INT 2F/AX=4310h"Cloaking"
--------m-2C0000-----------------------------
INT 2C P - Cloaking - ALLOCATE GDT SELECTOR
AX = 0000h
EBX = base address
CL = access mode byte
CH = extended access mode byte (omit limit field)
EDX = segment limit
Return: CF clear if successful
AX = selector
CF set on error
AX = error code (see #02556)
Notes: this INT 2C interface is used by Netroom's DPMI.EXE v3.00
to access extended memory, set the base address to the desired
physical address plus 400000h (4M)
this function was first introduced with RM386 (RAM-MAN/386) v6.00, the
memory manager included in Helix Software's Netroom
SeeAlso: AX=0001h,AX=0002h,AX=0003h,AX=0004h,AX=0005h,INT 31/AH=57h,#00501
(Table 02556)
Values for Cloaking error code:
0001h no more selectors
0002h not a GDT ring 0 selector
0003h invalid selector (out of range, not user selector)
0004h selector not allocated
--------m-2C0001-----------------------------
INT 2C P - Cloaking - FREE GDT SELECTOR
AX = 0001h
SI = selector
Return: CF clear if successful
CF set on error
AX = error code (see #02556)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0000h,INT 2F/AX=4310h"Cloaking"
--------m-2C0002-----------------------------
INT 2C P - Cloaking - SET SEGMENT BASE ADDRESS
AX = 0002h
SI = selector
EBX = new physical base addres
Return: CF clear if successful
CF set on error
AX = error code (see #02556)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0000h,AX=0003h,AX=0004h,INT 31/AX=0007h,#00501
--------m-2C0003-----------------------------
INT 2C P - Cloaking - SET SEGMENT LIMIT
AX = 0003h
SI = selector
EBX = new limit
Return: CF clear if successful
CF set on error
AX = error code (see #02556)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0000h,AX=0002h,AX=0004h,INT 31/AX=0008h
--------m-2C0004-----------------------------
INT 2C P - Cloaking - SET SEGMENT ACCESS MODE
AX = 0004h
SI = selector
CL = new access mode byte (see #00502)
Return: CF clear if successful
CF set on error
AX = error code (see #02556)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0000h,AX=0002h,AX=0003h,AX=0005h,INT 31/AX=0009h
--------m-2C0005-----------------------------
INT 2C P - Cloaking - SET SEGMENT EXTENDED ACCESS MODE
AX = 0005h
SI = selector
CL = new extended access mode byte (limit field ignored) (see #02557)
Return: CF clear if successful
CF set on error
AX = error code (see #02556)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0000h,AX=0002h,AX=0003h,AX=0004h,INT 31/AX=0009h
Bitfields for extended access mode byte:
Bit(s) Description (Table 02557)
7 4K granularity instead of byte granularity
6 32-bit code segment
5 reserved (0)
4 segment available to system
SeeAlso: #00505
--------m-2C0006-----------------------------
INT 2C P - Cloaking - GET PROTECTED-MODE INTERRUPT VECTOR
AX = 0006h
CL = vector (00h-7Fh)
Return: CF clear
DX:EBX -> current interrupt handler
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0007h,INT 31/AX=0204h
--------m-2C0007-----------------------------
INT 2C P - Cloaking - SET PROTECTED-MODE INTERRUPT VECTOR
AX = 0007h
CL = vector (00h-7Fh)
DX:EBX -> interrupt handler
Return: CF clear
Notes: this function was first introduced with RM386 (RAM-MAN/386) v6.00
the IDT entry's type remains unchanged
SeeAlso: AX=0006h,INT 31/AX=0205h
--------m-2C0008-----------------------------
INT 2C P - Cloaking - GET PASSALONG ADDRESS
AX = 0008h
Return: CF clear
DX:EBX = current passalong address
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0009h,AX=002Ch,INT 2F/AX=4310h"Cloaking"
--------m-2C0009-----------------------------
INT 2C P - Cloaking - SET PASSALONG ADDRESS
AX = 0009h
DX:EBX = new value for passalong address (see #02558)
Return: CF clear
Notes: when an INT 2C instruction is executed in V86 mode, the Cloaking host
calls the passalong address. The handler should check whether the
upcall is of interest to it, and if not it should jump to the old
passalong address (retrieved with AX=0008h before the handler was
installed). The final handler should return with CF clear to cause
the interrupt to be reflected back to V86 mode if none of the
passalong handlers is triggered
this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0008h,AX=002Dh,INT 2C"PASSALONG CHAIN"
(Table 02558)
Values Cloaking passalong address is called with:
EAX = CS:IP of byte following INT 2C instruction invoking passalong
SS:EBX -> caller registers (see #02559)
CF clear
others undefined
Return: CF clear: pass along to V86-mode INT 2C handler
CF set: return immediately to V86 mode
Format of Cloaking caller registers:
Offset Size Description (Table 02559)
00h DWORD EDI
04h DWORD ESI
08h DWORD EBP
0Ch DWORD reserved (ESP from PUSHAD instruction)
10h DWORD EBX
14h DWORD EDX
18h DWORD ECX
1Ch DWORD EAX
20h DWORD error code
24h DWORD EIP
28h WORD CS
2Ah WORD padding
2Ch DWORD EFLAGS
30h DWORD ESP
34h WORD SS
36h WORD padding
--remainder not available if protected-mode ring3 trap---
38h WORD ES
3Ah WORD padding
3Ch WORD DS
3Eh WORD padding
40h WORD FS
42h WORD padding
44h WORD GS
46h WORD padding
--------m-2C000A-----------------------------
INT 2C P - Cloaking - GET BASE ADDRESS OF GDT SELECTOR
AX = 000Ah
SI = selector
Return: CF clear if successful
EBX = segment base address
CF set on error
AX = error code (see #02556)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00, the
memory manager included in Helix Software's Netroom
SeeAlso: AX=0000h,AX=0002h,AX=000Bh
--------m-2C000B-----------------------------
INT 2C P - Cloaking - GET SELECTOR LIMIT
AX = 000Bh
SI = selector
Return: CF clear if successful
EBX = segment base address
CF set on error
AX = error code (see #02556)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=000Ah,INT 2F/AX=4310h"Cloaking"
--------m-2C---------------------------------
INT 2C P - RM386 v6.00 - CLOAKING - RESERVED FOR CLOAKED BIOS USE UNDER WINDOWS
AX = function (000Ch-001Fh)
--------m-2C000F-----------------------------
INT 2C P - Cloaking v1.01 - "Simulate_Shell_Event"
AX = 000Fh
ECX = event code (see #02560)
DX = subfunction for event
EDX high word = boost value (see #02561)
SI:EDI -> completion procedure
Return: CF clear if successful (event scheduled)
CF set on error
Note: this function is only available while MS Windows is running
SeeAlso: AX=0011h,AX=0012h,INT 2F/AX=1605h,INT 2F/AX=4310h"Cloaking"
(Table 02560)
Values for Cloaking shell event code:
0414h Hot key event
subevent 0000h: Alt-Space
subevent 0001h: Alt-Enter
subevent 0002h: Dir-VM
0415h Switch context
subevent 0000h for DOS VM context, nonzero for System VM context
0416h Clipboard event
0417h Termination event
subevent 0000h for normal termination, nonzero for error
0418h Display message
subevent 0000h for normal message, nonzero for system model ASAP
0419h Crash
041Ah Paste complete
subevent 0000h: normal
subevent 0001h: cancelled by user
subevent 0002h: cancelled
041Bh Contention event
041Ch Screen switch
subevent 0000h: forward
subevent 0001h: back
041Dh Filesystem change
041Eh Check Focus
041Fh Panic
Bitfields for boost value:
Bit(s) Description (Table 02561)
0 boost system VM until focus changes
1 boost system VM on Switcher screen
2 boost system VM until response
3 boost system VM during clipboard activity
4 boost system VM during print screen
5 boost system VM during update
--------m-2C0011-----------------------------
INT 2C P - Cloaking v1.01 - "Switch_VMs_and_Call_back"
AX = 0011h
EBX = handle of VM to be made active
SI:EDI -> 32-bit FAR completion procedure
Return: CF clear if successful (scheduled)
CF set on error
Notes: this function is only available while MS Windows is running
the completion procedure is called with CF clear if the specified
VM has been made active, or with CF set on error
SeeAlso: AX=000Fh,AX=0012h
--------m-2C0012-----------------------------
INT 2C P - Cloaking v1.01 - "Query_Current_VM"
AX = 0012h
Return: CF clear
EBX = handle of active VM
ESI = handle of system VM
ECX = VM status flags (see #02562)
EDX = shell flags (see #02563)
Note: this function is only available while MS Windows is running in enhanced
mode
SeeAlso: AX=000Fh,AX=0011h,AX=0013h
Bitfields for VM status flags:
Bit(s) Description (Table 02562)
0 in exclusive mode
1 runs in background
2 being created
3 suspended
4 not executable
5 executing in protected mode
6 contains PM application
7 32-bit PM application
8 called from VxD
9 high priority background
10 blocked on semaphore
11 awakening
12 has pageable V86
13 has locked V86
14 is scheduled
15 idle
16 closing
Bitfields for shell flags:
Bit(s) Description (Table 02563)
2 windowed
5 Alt-Tab reserved
6 Alt-Esc reserved
7 Alt-Space reserved
8 Alt-PrtSc reserved
9 Alt-Enter reserved
10 Alt-PrtSc reserved
11 PrtSc reserved
12 polling enabled
13 no HMA
14 has shortcut key
15 locked EMS handles
16 locked XMS handles
17 fast paste enabled
18 locked V86 memory
30 close-on-exit enabled
--------m-2C0013-----------------------------
INT 2C P - Cloaking v1.01 - "Issue_System_Modal_Message"
AX = 0013h
EDX = message box flags (see #02564)
DS:ECX -> ASCIZ message text
DS:EDI -> ASCIZ caption
Return: CF clear
EAX = response code
Note: this function is only available while MS Windows is running in enhanced
mode
SeeAlso: AX=000Fh,AX=0012h
Bitfields for message box flags:
Bit(s) Description (Table 02564)
3-0 response codes (see #02565)
7-4 icon codes
1 = Warning hand
2 = exclamation mark
4 = asterisk
9-8 default response (0 = first button, 1 = second, 2 = third)
12 message is system model
15 don't change focus
29 hang with interrupts enabled
30 do not window
31 execute ASAP
(Table 02565)
Values for response codes:
00h OK
01h OK, Cancel
02h Abort, Retry, Ignore
03h Yes, No, Cancel
04h Yes, No
05h Retry, Cancel
--------m-2C001D-----------------------------
INT 2C P - Cloaking v1.01 - GET INT 2C API HANDLER ENTRY POINT
AX = 001Dh
Return: CF clear
DX:EBX = selector:offset of Cloaking host INT 2C handler
Desc: get the Cloaking host's entry point to bypass any other programs
which may have hooked INT 2C in protected mode
Note: the returned entry point must be called with a simulated INT, i.e.
a PUSHD must precede the far call to the handler
SeeAlso: INT 2F/AX=4310h"Cloaking"
--------m-2C001E-----------------------------
INT 2C P - Cloaking v1.01 - CLEAR CRITICAL SECTION
AX = 001Eh
Return: CF clear
Desc: allow MS Windows to switch to another VM after having prevented it
by invoking a critical section
SeeAlso: AX=001Fh,INT 15/AX=101Ch,INT 2F/AX=1682h
--------m-2C001F-----------------------------
INT 2C P - Cloaking v1.01 - SET CRITICAL SECTION
AX = 001Fh
Return: CF clear
Desc: prevent MS Windows from switching to another VM
SeeAlso: AX=001Eh,INT 15/AX=101Bh,INT 2F/AX=1681h
--------m-2C0020-----------------------------
INT 2C P - Cloaking - GET SIZE OF PROTECTED-MODE STATE
AX = 0020h
Return: EAX = number of bytes required for storing state
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0021h,AX=0022h
--------m-2C0021-----------------------------
INT 2C P - Cloaking - SAVE PROTECTED-MODE STATE
AX = 0021h
ES:EDI -> buffer for protected-mode state
Return: CF clear
buffer filled
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0020h,AX=0022h
--------m-2C0022-----------------------------
INT 2C P - Cloaking - RESTORE PROTECTED-MODE STATE
AX = 0022h
DS:ESI -> buffer containing previously-saved protected-mode state
Return: CF clear if successful
state restored
CF set on error (invalid buffer contents)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0020h,AX=0021h
--------m-2C0023-----------------------------
INT 2C P - Cloaking - ISSUE PROTECTED-MODE XMS CALL
AX = 0023h
Notes: not currently implemented--NOP in RM386 v6.00
this function was first introduced with RM386 (RAM-MAN/386) v6.00
--------m-2C0024-----------------------------
INT 2C P - Cloaking - SET V86-MODE STACK
AX = 0024h
DX:EBX = new value for V86-mode SS:ESP
Return: nothing
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
--------m-2C0025-----------------------------
INT 2C P - Cloaking - CALL V86-MODE PROCEDURE
AX = 0025h
DS:EBX -> client register structure (see #02559)
Return: CF clear if successful
client register structure updated
CF set if no more nested procedure call space available
Notes: this call uses the V86-mode stack supplied in the client structure, and
calls the routine specified by CS:IP in the client structure
this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0026h,AX=0027h,INT 31/AX=0301h
--------m-2C0026-----------------------------
INT 2C P - Cloaking - CALL V86-MODE INTERRUPT HANDLER
AX = 0026h
DS:EBX -> client register structure (see #02559)
CX = interrupt number
Return: CF clear if successful
client register structure updated
CF set if no more nested procedure call space available
Notes: this call uses the V86-mode stack supplied in the client structure
this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0025h,AX=0027h,INT 31/AX=0300h
--------m-2C0027-----------------------------
INT 2C P - Cloaking - CHAIN TO V86-MODE INTERRUPT HANDLER
AX = 0027h
DS:EBX -> client register structure (see #02559)
Return: CF clear if successful
client register structure updated
CF set if no more nested procedure call space available
Notes: this call uses the V86-mode stack supplied in the client structure,
and jumps to the address specified by CS:IP in the client structure
this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0025h,AX=0026h
--------m-2C0028-----------------------------
INT 2C P - Cloaking - GET ESP0 FROM TSS
AX = 0028h
Return: CF clear
EAX = TSS's ESP0
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00, the
memory manager included in Helix Software's Netroom
--------m-2C0029-----------------------------
INT 2C P - Cloaking - SET SECONDARY STACK
AX = 0029h
DX:EBX = new value for SS:ESP of ring 3 secondary stack
Return: CF clear
Desc: inform RM386 of the ring 3 interrupt stack location
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
--------m-2C002A-----------------------------
INT 2C P - Cloaking - SET 8259 IRQ BASE VECTORS
AX = 002Ah
BL = base vector of master interrupt controller
CL = base vector of slave interrupt controller
Notes: this call merely informs RM386 that the caller has changed the
interrupt mappings
this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: INT 67/AX=DE0Bh
--------m-2C002BCH81-------------------------
INT 2C P - Cloaking - PROTECTED-MODE VIRTUAL DMA SERVICES
AX = 002Bh
CH = 81h
CL = subfunction (02h-0Ch)
other registers as appropriate for subfunction
Return: varies by function
CF set on error
Notes: these functions are equivalent to the INT 4B/AX=81xxh subfunctions
with the same numbers
this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: INT 4B/AX=8102h,INT 4B/AX=810Ch
--------m-2C002C-----------------------------
INT 2C P - Cloaking - GET PORT-TRAPPING PASSALONG
AX = 002Ch
Return: CF clear
DX:EBX = current I/O trapping passalong address
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0008h,AX=002Dh
--------m-2C002D-----------------------------
INT 2C P - Cloaking - SET PORT-TRAPPING PASSALONG
AX = 002Dh
DX:EBX = new I/O trapping passalong address (see #02566)
Return: CF clear
Notes: RM386 calls the passalong address whenever an access to a monitored
I/O port is attempted; the handler should check whether it is a port
that it is interested in, and if not call the previous passalong
address (which was retrieved with AX=002Ch before installing the
new handler)
this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=0009h,AX=002Ch,INT 67/AX=5DEAh
(Table 02566)
Values Cloaking port-trapping passalong address is called with:
EAX = CS:IP of faulting instruction (unless executing in protected-mode
ring 3)
SS:EBX -> caller register structure (see #02559)
check EFLAGS V86-mode bit for type
CX = first two bytes of I/O instruction which was trapped
DX = port to which I/O is being performed
CF clear
Return: CF clear if RM386 should perform I/O operation
CF set if I/O should be skipped
Note: RM386 skips the trapped I/O instruction, so the passalong handler
should not modify the client CS:EIP
--------m-2C002E-----------------------------
INT 2C P - Cloaking - TRAP I/O PORT
AX = 002Eh
DX = port number to trap
Return: CF clear if successful
CF set on error (port out of range or reserved)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=002Fh,AX=0030h
--------m-2C002F-----------------------------
INT 2C PU - Cloaking - UNTRAP I/O PORT
AX = 002Fh
DX = port number for which to cancel trapping
Return: CF clear if successful
CF set on error (port out of range or reserved)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=002Eh,AX=0030h
--------m-2C0030-----------------------------
INT 2C PU - Cloaking - GET TRAPPING STATE OF SPECIFIED PORT
AX = 0030h
DX = port number
Return: CF clear if successful
BX = current state (0000h not trapped, 0001h trapped)
CF set on error (port out of range or reserved)
Note: this function was first introduced with RM386 (RAM-MAN/386) v6.00
SeeAlso: AX=002Eh,AX=002Fh
--------m-2C0031-----------------------------
INT 2C PU - RM386 v6.00 - BUG
AX = 0031h
Program: RM386 (RAM-MAN/386) is the memory manager included in Helix
Software's Netroom
Note: due to a fencepost error, RM386 v6.00 will branch unpredictably if
invoked with this function
--------m-2C0031-----------------------------
INT 2C P - Cloaking v1.01 - ALLOCATE V86 CALLBACK
AX = 0031h
DX:EBX = CS:EIP of protected-mode routine to be invoked by callback
Return: CF clear if successful
EBX = CS:IP of V86-mode callback handler
CF set on error
SeeAlso: AX=0032h
--------m-2C0032-----------------------------
INT 2C P - Cloaking v1.01 - FREE V86 CALLBACK
AX = 0032h
EBX = CS:IP of V86-mode callback handler
Return: CF clear if successful
CF set on error
AX = error code
0005h invalid callback address
0006h callback already free
SeeAlso: AX=0032h
--------m-2C0033-----------------------------
INT 2C P - Cloaking v1.01 - REGISTER CLOAKING CLIENT
AX = 0033h
DS:EDX -> client registration structure (see #02567)
Return: CF clear if successful
CF set on error (linked list corrupt)
SeeAlso: AX=0034h,#02778 at INT 2F/AX=4310h"Cloaking"
Format of client registration structure:
Offset Size Description (Table 02567)
00h PWORD link to next structure
06h PWORD link to previous structure
0Ch 2 BYTEs client version (major, minor)
0Eh 20 BYTEs client name
22h DWORD physical address of client start
26h DWORD client's total size in bytes
Note: the link area should not be modified once the structure has been
used for the registration call
--------m-2C0034-----------------------------
INT 2C P - Cloaking v1.01 - UNREGISTER CLOAKING CLIENT
AX = 0034h
DS:EDX -> client registration structure (see #02567)
Return: CF clear if successful
CF set on error (linked list corrupt)
Note: the client must unregister before freeing the XMS block containing
its registration structure(s)
SeeAlso: AX=0033h,#02778 at INT 2F/AX=4310h"Cloaking"
--------D-2D---------------------------------
INT 2D - DOS 2+ - RESERVED
Note: this vector is not used in DOS versions <= 6.00, and points at an IRET
BUG: RM386 v6.00-6.02 (as distributed with Helix's Netroom v3.x) contains
a stack bug in its protected-mode INT 2D handler which causes a crash
when INT 2D is invoked from V86 mode
--------t-2D---------------------------------
INT 2D - ALTERNATE MULTIPLEX INTERRUPT SPECIFICATION (AMIS) [v3.6]
AH = multiplex number
AL = function
00h installation check
01h get private entry point
02h uninstall
03h request popup
04h determine chained interrupts
05h get hotkey list
06h get device-driver information
07h-0Fh reserved for future enhancements
Return: AL = 00h (not implemented)
other application-dependent
other registers vary by function (also see individual entries below)
Return: varies by function
Notes: programs should not use fixed multiplex numbers; rather, a program
should scan all multiplex numbers from 00h to FFh, remembering the
first unused multiplex in case the program is not yet installed.
For multiplex numbers which are in use, the program should compare
the first 16 bytes of the signature string to determine whether it
is already installed on that multiplex number. If not previously
installed, it should use the first free multiplex number.
functions other than 00h are not valid unless a program is installed
on the selected multiplex number
to be considered fully compliant with version 3.6 of the specification,
programs must implement at least functions 00h, 02h (no resident
uninstall code required), and 04h (return value 04h). TSRs that
provide hotkeys with which the user can activate them must also
implement function 05h. TSRs which provide DOS device drivers must
also implement function 06h. The absolute minimum fully-compliant
implementation has an overhead of 64 bytes (80 bytes with function
05h) plus 22 bytes per hooked interrupt (for the interrupt sharing
protocol header and hook list entry).
the signature string and description may be used by memory mappers
to display the installed programs
to be considered fully compliant, users of this specification must
adhere to the IBM interrupt sharing protocol (see #02568), which will
permit removal of TSRs in arbitrary order and interrupt handler
reordering. All TSRs following this specification should be
removable unless they are loaded from CONFIG.SYS, though they need
not keep the code for removing themselves resident; it is acceptable
for a separate program to perform the interrupt unhooking and
memory-freeing steps of removal.
A sample public-domain implementation including example TSRs and
utility programs may be found in a separate package distributed as
AMISLnnn.ZIP (AMISL092.ZIP as of this writing).
Please let me know if you choose to follow this proposal. The
signature and a list of the private API calls you use would be
appreciated, as well.
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h
SeeAlso: INT 2D/AL=05h,INT 2D/AL=06h,INT 2F"NOTES"
Format of interrupt sharing protocol interrupt handler entry point:
Offset Size Description (Table 02568)
00h 2 BYTEs short jump to actual start of interrupt handler, immediately
following this data block (EBh 10h)
02h DWORD address of next handler in chain
06h WORD signature 424Bh
08h BYTE EOI flag
00h software interrupt or secondary hardware interrupt handler
80h primary hardware interrupt handler (will issue EOI to
interrupt controller)
09h 2 BYTEs short jump to hardware reset routine
must point at a valid FAR procedure (may be just RETF)
0Bh 7 BYTEs reserved (0) by IBM for future expansion
Note: when chaining to the prior handler, the interrupt handler must perform
an indirect jump/call using the address at offset 02h in the
ISP header. This permits another AMIS TSR to hook itself into
the chain at a position other than as the first handler to receive
an interrupt.
SeeAlso: INT F1/AH=01h"Common ISDN API",INT F1/AH=06h"CAPI",#04068
--------t-2D--00-----------------------------
INT 2D - AMIS v3.0+ - INSTALLATION CHECK
AL = 00h
AH = multiplex number for program
Return: AL = 00h if free
AL = FFh if multiplex number in use
CX = binary version number (CH = major, CL = minor)
DX:DI -> signature string (see #02569) identifying the program
using the multiplex number
SeeAlso: INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h,INT 2D/AL=05h
SeeAlso: INT 2D/AL=06h
Index: installation check;Alternate Multiplex Interrupt Specification
Index: installation check;AMIS|installation check;FASTMOUS
Index: installation check;SPELLER|installation check;Monitor
Index: installation check;NOLPT|installation check;NOTE
Index: installation check;RBkeyswp|installation check;SWITCHAR
Index: installation check;VGABLANK|installation check;EATMEM
Index: installation check;RECALL|installation check;XPTR2
Format of AMIS signature string:
Offset Size Description (Table 02569)
00h 8 BYTEs blank-padded manufacturer's name (possibly abbreviated)
08h 8 BYTEs blank-padded product name
10h 64 BYTEs ASCIZ product description (optional, may be a single 00h)
Note: it is not necessary to reserve a full 64 bytes for the description,
just enough to store the actual ASCIZ string
SeeAlso: #02570
(Table 02570)
Values for AMIS signatures known to be in use:
'Byrial J' 'EKLAVO ' permits keyboard entry of Esperanto accented letters
'CoveSoft' 'Burnout+' shareware screen saver Burnout Plus
'Crynwr ' 'SPELLER ' TSR spelling-checker
'CPH1995 ' 'CDTSR ' resident CD-Audio player
'CPH1996 ' 'DSAPI '
'CSJewell' 'Modula3L' Curtis Jewell's Modula-3 compiler (non-TSR)
'Cubbi...' 'ASCII...' Example ASCII code view/enter TSR by Sergey Zubkov
'Cubbi...' 'ScrnGrab' Example screen grabber by Sergey Zubkov
'DAISYCHA' 'INDRIVER' Advanced Parallel Port daisy chain driver (vendor name
in product description field, if desired)
(see also INT 2D/AL=DCh)
'DTown SD' 'DTU ' DTown Software Development's DTown Utilities
(see also INT 2D/AL=20h)
'ECLIPSE ' 'PLUMP ' Eclipse Software's printer and plotter spooler
'GraySoft' 'GIPC ' GraySoft's Inter-Process Communications driver
'heathh ' 'Monitor '
'Helge O ' TSRs by Helge Olav Helgesen
'IVALM SK' 'lmkey ' Russian keyboard driver by Sergey Khabarov
'IVALM SK' 'lmrus ' Russian screen driver by Sergey Khabarov
'J. Berry' 'RATSR ' RemoteAccess Network Manager workstation module
'JWB ' 'RAMLIGHT' James Birdsall's on-screen RAMdisk activity indicator
'M Better' 'iHPFS ' Marcus Better's HPFS filesystem driver for DOS
'M. Paul ' 'FREEVER ' DOS version-faking TSR by Matthias Paul
'Nildram ' 'ST ' Screen Thief graphics screen grabber
'NoBrain ' 'FlatReal' Flat real mode monitor by Sergei Shtylyov
'NoBrain ' 'Grabber ' Frame grabber drivers by Sergei Shtylyov
'NoBrain ' 'SqrModes' TSR providing some non-standard video modes
by Sergei Shtylyov
'Pino Nav' 'ALTMENU ' activate any program's menu bar by pressing Alt key
'Pino Nav' 'Keybit ' Pino Navato's KEYBIT Lite Italian keyboard driver v4+
'PowrQuot' 'CAPRILOG'
'PowrQuot' 'CAPRITSR'
'PowrQuot' 'CAPRIWIN'
'R-Ware ' 'dLite ' run-time data decompression TSR
'Ralf B ' 'disaXXYY' RBdisabl -- disable key scancode XX w/ shift states YY
'Ralf B ' 'DUALVGA ' dual-VGA support, screen blanker, and DPMS driver
'Ralf B ' 'FASTMOUS' example TSR included with sample AMIS library code
'Ralf B ' 'NoBreak ' disable Ctrl-@, Ctrl-C, and Ctrl-Break keys
'Ralf B ' 'NOLPT n ' example TSR -- turn LPTn into bit-bucket
'Ralf B ' 'NOTE ' example TSR -- popup note-taker
'Ralf B ' 'RBclock ' RBclock -- on-screen real-time clock
'Ralf B ' 'RBclockE' RBclock -- on-screen elapsed-time clock
'Ralf B ' 'RBdvorak' Dvorak keyboard mapping w/ opt Esc/~, LCtrl/CapsLk swap
'Ralf B ' 'RBkcount' display count of keystrokes on screen
'Ralf B ' 'RBkeyswp' RBkeyswap v3.0+ -- swap Esc/~ and LCtrl/CapsLock keys
'Ralf B ' 'RBnoboot' disable Ctrl-Alt-Del key combination
'Ralf B ' 'ShftCaps' require Shift-CapsLock to turn on CapsLock
'Ralf B ' 'ShftNumL' require Shift-NumLock to turn off NumLock
'Ralf B ' 'SWITCHAR' example TSR -- add switchar() support removed from DOS5
'Ralf B ' 'VGABLANK' VGA-only screen blanker
'Ralf B ' 'WINTAME ' yield CPU when program in Win95 DOS box is idle
'Sally IS' 'Mdisk ' removeable, resizeable RAMdisk
'Sally IS' 'Scr2Tex ' screen dumper with output in (La)Tex format
'SRT ' 'STOPBOOT' reboot preventer by Steve Talbot
'Thaco ' 'NEST ' Eirik Pedersen's programmer's delimiter matcher
'TifaWARE' 'EATMEM ' George A. Theall's public domain memory restrictor for
testing programs (v1.1+)
'TifaWARE' 'RECALL ' public domain commandline editor and history (v1.2+)
'Todd ' 'XPTR2 ' PC-to-Transputer interface by Todd Radel
'WlkngOwl' 'NoiseSYS' NOISE.SYS random-number generator
SeeAlso: #02569
--------t-2D--01-----------------------------
INT 2D - AMIS v3.0+ - GET PRIVATE ENTRY POINT
AL = 01h
AH = multiplex number for program
Return: AL = 00h if all API calls via INT 2D
AL = FFh if entry point supported
DX:BX -> entry point for bypassing interrupt chain
Note: this function is not valid unless a program is installed on the
specified multiplex number; use INT 2D/AL=00h to check
SeeAlso: INT 2D/AL=00h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h,INT 2D/AL=05h
SeeAlso: INT 2D/AL=06h
Index: entry point;Alternate Multiplex Interrupt|entry point;AMIS
--------t-2D--02-----------------------------
INT 2D - AMIS v3.0+ - UNINSTALL
AL = 02h
AH = multiplex number for program
DX:BX = return address for successful uninstall (may be ignored by TSR)
Return: AL = status
00h not implemented (makes TSR non-compliant with specification)
01h unsuccessful
02h can not uninstall yet, will do so when able
03h safe to remove, but no resident uninstaller
(TSR still enabled)
BX = segment of memory block with resident code
04h safe to remove, but no resident uninstaller
(TSR now disabled)
BX = segment of memory block with resident code
05h not safe to remove now, try again later
06h disabled, but can not be removed from memory
because loaded from CONFIG.SYS
07h safe to remove, but no resident device-driver
uninstaller. Caller must unlink device
drivers from DOS device chain as well as
unhooking interrupts and freeing memory
BX = segment of memory block with resident code
FFh successful
return at DX:BX with AX destroyed if successful and TSR honors
specific return address
Note: this function is not valid unless a program is installed on the
specified multiplex number; use INT 2D/AL=00h to check
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=03h,INT 2D/AL=04h,INT 2D/AL=05h
SeeAlso: INT 2D/AL=06h
Index: uninstall;Alternate Multiplex Interrupt Specification|uninstall;AMIS
--------t-2D--03-----------------------------
INT 2D - AMIS v3.0+ - REQUEST POP-UP
AL = 03h
AH = multiplex number for program
Return: AL = status
00h not implemented or TSR is not a pop-up
01h can not pop up at this time, try again later
02h can not pop up yet, will do so when able
03h already popped up
04h unable to pop up, user intervention required
BX = standard reason code
0000h unknown failure
0001h interrupt chain passes through memory
which must be swapped out to pop up
0002h swap-in failed
CX = application's reason code if nonzero
FFh TSR popped up and was exited by user
BX = return value
0000h no return value
0001h TSR unloaded
0002h-00FFh reserved
0100h-FFFFh application-dependent
Note: this function is not valid unless a program is installed on the
specified multiplex number; use INT 2D/AL=00h to check
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=04h,INT 2D/AL=05h
SeeAlso: INT 2D/AL=06h
--------t-2D--04-----------------------------
INT 2D - AMIS v3.0+ - DETERMINE CHAINED INTERRUPTS
AL = 04h
AH = multiplex number for program
BL = interrupt number (except 2Dh)
Return: AL = status
00h not implemented (makes TSR non-compliant with specification)
01h (obsolete) unable to determine
02h (obsolete) interrupt hooked
03h (obsolete) interrupt hooked, address returned
DX:BX -> TSR's interrupt BL handler
04h list of hooked interrupts returned
DX:BX -> interrupt hook list (see #02571)
FFh interrupt not hooked
Notes: BL is ignored if the TSR returns AL=04h; in that case, the caller
needs to scan the return list rather than making additional calls
to this function. If the return is not 00h or 04h, then the caller
must cycle through the remaining interrupt numbers it wishes to
check.
return values 01h through 03h may not be used by AMIS v3.6-compliant
programs; they are included here solely for compatibility with
version 3.3, though they were probably never used in any
implementation
for return values 01h through 03h, since INT 2D is known to be hooked,
the resident code need not test for BL=2Dh (to minimize its size),
and the return value is therefore undefined in that case.
this function is not valid unless a program is installed on the
specified multiplex number; use INT 2D/AL=00h to check
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=05h
SeeAlso: INT 2D/AL=06h
Format of AMIS interrupt hook list [array]:
Offset Size Description (Table 02571)
00h BYTE interrupt number (last entry in array is 2Dh)
01h WORD offset within hook list's segment of the interrupt handler
this will point at the initial short jump of the interrupt
sharing protocol header (see #02568)
SeeAlso: #02572
--------t-2D--05-----------------------------
INT 2D - AMIS v3.5+ - GET HOTKEYS
AL = 05h
AH = multiplex number for program
Return: AL = status
00h not implemented
FFh supported
DX:BX -> hotkey list (see #02572)
Notes: this function is not valid unless a program is installed on the
specified multiplex number; use INT 2D/AL=00h to check
programs which provide hotkeys are required to provide this function
to be fully compliant with this specification
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h
SeeAlso: INT 2D/AL=06h
Format of AMIS hotkey list:
Offset Size Description (Table 02572)
00h BYTE type of hotkey checking (see #02573)
01h BYTE number of hotkeys (may be zero if TSR can disable hotkeys)
02h 6N BYTEs array of hotkey definitions
(one per hotkey, first should be primary hotkey)
Offset Size Description
00h BYTE hotkey scan code (00h/80h if shift states only)
hotkey triggers on release if bit 7 set
01h WORD required shift states (see #02574)
03h WORD disallowed shift states (see #02574)
05h BYTE hotkey flags (see #02575)
Notes: except for bit 7, the shift states correspond exactly to the return
values from INT 16/AH=12h. A set bit in the required states word
indicates that the corresponding shift state must be active when the
hotkey's scan code is received for the hotkey to be recognized; a
clear bit means that the corresponding state may be ignored. A set
bit in the disallowed shift states word indicates that the
corresponding shift state must be inactive.
for the disallowed-states word, if one of the "either" bits is set,
then both the corresponding left bit and right bit must be set
examples:
Ctrl-Alt-Del monitoring: 53h 000Ch 0003h 06h
Alt-key tap (DESQview): B8h 0000h 0007h 08h
Shf-Shf-N (NOTE.COM): 31h 0003h 000Ch 00h
Index: hotkeys;AMIS
SeeAlso: #00006
Bitfields for type of AMIS hotkey checking:
Bit(s) Description (Table 02573)
0 checks before chaining INT 09
1 checks after chaining INT 09
2 checks before chaining INT 15/AH=4Fh
3 checks after chaining INT 15/AH=4Fh
4 checks on INT 16/AH=00h,01h,02h
5 checks on INT 16/AH=10h,11h,12h
6 checks on INT 16/AH=20h,21h,22h
7 reserved (0)
SeeAlso: #02572
Bitfields for AMIS shift states:
Bit(s) Description (Table 02574)
0 right shift pressed
1 left shift pressed
2 either control key pressed
3 either Alt key pressed
4 ScrollLock active
5 NumLock active
6 CapsLock active
7 either shift key pressed
8 left control key pressed
9 left Alt key pressed
10 right control key pressed
11 right Alt key pressed
12 ScrollLock pressed
13 NumLock pressed
14 CapsLock pressed
15 SysReq key pressed
Notes: if bit 2 is set, either control key may be pressed for the hotkey; if
bits 8 and 10 are both set, then both control keys must be pressed.
Similarly for bits 3 and 9/11, as well as 7 and 0/1.
the SysReq key is often labeled SysRq
SeeAlso: #02572,#02575
Bitfields for AMIS hotkey flags:
Bit(s) Description (Table 02575)
0 hotkey chained before processing
1 hotkey chained after processing
2 others should pass through this hotkey so that it can be monitored
3 hotkey will not activate if other keys pressed/released before hotkey
press is completed
4 this key is remapped into some other key
5 this key is conditionally chained (sometimes passed on, sometimes
swallowed)
6-7 reserved (0)
SeeAlso: #02572,#02574
--------t-2D--06-----------------------------
INT 2D - AMIS v3.6 - GET DEVICE-DRIVER INFORMATION
AL = 06h
AH = multiplex number for program
Return: AL = number of device driver headers supplied by prog.
AH = device-driver flags (see #02576)
DX:BX -> first device driver header (see #01646)
Program: AMIS is the Alternate Multiplex Interrupt Specification promulgated
by Ralf Brown
Notes: if AL=00h, AH,BX,DX are meaningless and may be destroyed
this function is not valid unless a program is installed on the
specified multiplex number; use INT 2D/AL=00h to check
programs which provide device drivers are required to support this
function to be considered fully compliant with v3.6+ of the
specification
SeeAlso: INT 2D/AL=00h,INT 2D/AL=01h,INT 2D/AL=02h,INT 2D/AL=03h,INT 2D/AL=04h
SeeAlso: INT 2D/AL=05h
Bitfields for AMIS device-driver information flags:
Bit(s) Description (Table 02576)
0 program loaded from CONFIG.SYS, and thus can not be removed from memory
(leave clear if unable to determine)
1 device driver headers have not been linked into DOS device chain
2 reentrant device driver(s)
--------N-2D--10-----------------------------
INT 2D - RATSR 2.0+ - GET STATUS
AL = 10h
AH = AMIS multiplex number for RATSR
Return: AL = status
01h listening (no connection)
02h receiving \
03h sending > station being monitored
04h initializing receive /
AH = keyboard lock status (00h unlocked, 01h locked)
Program: RATSR is a utility by James Berry provided with
RemoteAccess/Professional, a commercial bulletin board system, that
allows remote control of a station over a network
SeeAlso: INT 2D"AMIS"
--------d-2D--10-----------------------------
INT 2D - dLite 1.0+ - GET PARAMETER BLOCK ADDRESS
AL = 10h
AH = AMIS multiplex number for dLite
Return: CF clear if successful
ES:BX -> parameter block (see #02577)
CF set on error
Program: dLite is a shareware TSR by Rainer Schuetze which transparently
expands compressed files when they are read
SeeAlso: AL=11h"dLite",AL=12h"dLite",INT 21/AX=FEDCh"PCMANAGE"
Format of dLite parameter block:
Offset Size Description (Table 02577)
00h BYTE TSR flags (see #02578)
01h WORD maximum number of programs needing original filesize
03h WORD current number of programs needing original filesize
05h WORD maximum number of files that can be handled by dLite (should
be the same as FILES= in CONFIG.SYS)
07h WORD offset (in the same segment as the parameter block) of the
table of programs needing the original filesize (8 bytes
each, without path or extension, uppercase, and zero \
terminated if shorter than 8 bytes)
Bitfields for dLite TSR flags:
Bit(s) Description (Table 02578)
0 deny FCB access
1 dLite sleeping rather than activated
2 always indicate original filesize when reading directory entries,
rather than only for specified programs
3-7 reserved
SeeAlso: #02577
--------V-2D--10-----------------------------
INT 2D - Burnout Plus v3.00 - GET STATE/CONTROL INFORMATION
AL = 10h
AH = AMIS multiplex number for Burnout Plus
Return: AL = 01h
BX = Burnout Plus status (see #02579)
CX = record of features loaded (see #02580)
ES:DI -> Burnout Plus control structure (see #02581)
Program: Burnout Plus is a DOS screen saver from Cove Software
SeeAlso: INT 14/AX=AA01h,INT 2D"AMIS"
Index: screen saver;Burnout Plus
Bitfields for Burnout Plus status:
Bit(s) Description (Table 02579)
0 screen is blanked
1 MS Windows is active (Burnout Plus deactivated)
2-15 reserved
Bitfields for Burnout Plus features loaded/features enabled:
Bit(s) Description (Table 02580)
0 mouse activity monitor
1 passkey support
2 password support
3 continuous clear
4 software blanking
5 video activity monitor
6 disk activity monitor
7 activating keystroke suppression
SeeAlso: #02581
Format of Burnout Plus control structure:
Offset Size Description (Table 02581)
00h BYTE size of structure in bytes
01h WORD Burnout Plus version
03h WORD screen blanking reset count in clock ticks
05h WORD current countdown value in clock ticks
07h BYTE type of timeout specification
08h BYTE instant-blank hotkey
09h WORD extended status information (see #02582)
the bits for password, passkey, and software blanking are
ignored and cannot be enabled or disabled externally
0Bh WORD features enabled (see #02580)
Note: all fields except the first two may be modified by external programs
to affect the operation of Burnout Plus
Index: hotkeys;Burnout Plus
Bitfields for extended Burnout Plus status information:
Bit(s) Description (Table 02582)
0 Burnout Plus disabled
1 force screen to blank on next clock tick
2 restore screen if currently blanked
3-15 reserved
Note: 1 and 2 are automatically cleared by Burnout Plus after blanking
or restoring the screen
SeeAlso: #02581
--------V-2D--10-----------------------------
INT 2D U - Screen Thief v1.00 - FREE HIGH MEMORY BUFFERS
AL = 10h
AH = AMIS multiplex number for Screen Thief
Return: nothing
Program: Screen Thief is a graphics screen grabber
Note: releases any code and data stored in EMS, DOS UMBs, or XMS UMBs, but
does not release the low-memory stub; this may be used to effect a
partial uninstall if INT 2D/AL=02h fails
SeeAlso: INT D8"Screen Thief"
--------i-2D--10-----------------------------
INT 2D U - RAMLIGHT v1.0 - GET MONITORING INFORMATION
AL = 10h
AH = AMIS multiplex number for RAMLIGHT
Return: ES:BX -> array of fake device driver headers used in monitoring
CX = number of drives being monitored???
--------U-2D--10-----------------------------
INT 2D - DTown Utilities v1.40+ - EXTENDED API INSTALLATION CHECK
AL = 10h
Return: AL = FFh
BL = extended API availability (00h no, 01h API is loaded)
SeeAlso: INT 2D/AL=11h"DTown",INT 2D/AL=20h,INT 2D/AL=50h
--------s-2D--10-----------------------------
INT 2D - CDTSR - GET INTERNAL VARIABLE TABLE
AL = 10h
AH = AMIS multiplex number for CDTSR
Return: CX:DX -> CDTSR internal variable structure (see #02583)
Program: CDTSR is a resident audio CD player by Colin Hill
SeeAlso: INT 2D/AL=11h"CDTSR",INT 2D/AL=12h"CDTSR",INT 2D/AL=13h"CDTSR"
Format of CDTSR internal variable structure:
Offset Size Description (Table 02583)
00h BYTE hotkey scan code (see #00006)
01h BYTE hotkey shift states
02h BYTE flag: repeat
03h BYTE flag: custom repeat
04h BYTE flag: background polling
05h DWORD (read-only) internal timing variable
09h DWORD current track play position, in frames
0Dh DWORD current disk play position, in frames
11h BYTE number of entries in track program
12h BYTE index into track program currently playing (FFh if not playing)
13h 100 BYTEs track program (each byte contains one track number)
77h BYTE saved cursor end scan line
78h BYTE saved cursor start scan line
79h BYTE currently playing track
7Ah BYTE CD driver media-change flag
7Bh WORD video base segment during last popup
7Dh WORD video page offset during last popup
7Fh BYTE currently-selected track
80h DWORD begin of custom repeat, in frames
84h DWORD end of custom repeat, in frames
88h WORD track program index of top list item
--------K-2D--10-----------------------------
INT 2D - KEYBIT Lite v5+ - GET POINTER TO STATUS BYTE
AL = 10h
AH = AMIS multiplex number for KEYBIT Lite
Return: DX:BX -> status byte (see #02584)
Program: KEYBIT Lite is an enhanced Italian keyboard driver by Pino Navato.
SeeAlso: INT 2D"AMIS"
Bitfields for KEYBIT Lite status byte:
Bit(s) Description (Table 02584)
7 KEYBIT Lite active
6 E-mail support active
5-0 reserved
Notes: E-mail support is one of the original features of KEYBIT Lite. It is
the automatic conversion of the 8-bits ASCII chars produced by some
keys available on Italian keyboards to couples of 7-bits chars.
Message editors should always enable e-mail support, they should also
restore its original status before exiting.
The user can change both status bits by hotkeys.
--------K-2D--10-----------------------------
INT 2D - ALTMENU - GET POINTER TO KEY CODE
AL = 10h
AH = AMIS multiplex number for signature 'Pino Nav' 'ALTMENU '
Return: DX:BX -> WORD key code to insert in keyboard buffer on Alt-key tap
Program: Pino Navato's freeware ALTMENU permits activating the menu bar of
any program by pressing the Alt key alone.
Notes: The value in the key code word will be returned in AX by a call to
INT 16/AH=00h after the Alt key is pressed by itself
ALTMENU may be disabled by setting the key code equal to 0000h
SeeAlso: INT 16/AH=00h,INT 2D"AMIS"
--------d-2D--11-----------------------------
INT 2D - dLite 1.0+ - CHECK FOR dPressed FILE AND GET ORIGINAL SIZE
AL = 11h
AH = AMIS multiplex number for dLite
BX = file handle
Return: CF clear if successful
DX:AX = size of uncompressed file
CF set on error (not dPressed file)
SeeAlso: AL=10h"dLite",AL=12h"dLite"
--------U-2D--11-----------------------------
INT 2D - DTown Utilities v1.40+ - UTILITY INSTALLATION CHECK
AL = 11h
BL = function
00h get number of installed utilities
Return: BL = number of utilities
01h get installed utilities
DX:DI -> buffer containing one byte for each utility
Return: DX:DI buffer filled with flags (0=no,1=yes) indicating
whether the corresponding utility is loaded
Return: AL = FFh if supported
Note: this function is only available if the extended API has been installed
in the resident portion
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h
--------s-2D--11-----------------------------
INT 2D - CDTSR - REPROGRAM CDTSR
AL = 11h
AH = AMIS multiplex number for CDTSR
Return: nothing
Program: CDTSR is a resident audio CD player by Colin Hill
Desc: reprograms CDTSR based on the values in the internal variable
structure (see #02583), which may have been changed by an application
SeeAlso: INT 2D/AL=10h"CDTSR",INT 2D/AL=12h"CDTSR",INT 2D/AL=13h"CDTSR"
--------d-2D--12-----------------------------
INT 2D - dLite 1.0+ - CHECK FOR dPressed FILE AND GET COMPRESSED SIZE
AL = 12h
AH = AMIS multiplex number for dLite
BX = file handle
Return: CF clear if successful
DX:AX = size of compressed file
CF set on error (not dPressed file)
SeeAlso: AL=10h"dLite",AL=11h"dLite"
--------s-2D--12-----------------------------
INT 2D - CDTSR - DISABLE POPUP
AL = 12h
AH = AMIS multiplex number for CDTSR
Return: nothing
SeeAlso: INT 2D/AL=10h"CDTSR",INT 2D/AL=11h"CDTSR",INT 2D/AL=13h"CDTSR"
--------U-2D--12-----------------------------
INT 2D - FREEVER - GET ORIGINAL DOS VERSION INFO
AL = 12h
AH = AMIS multiplex number for FREEVER
Return: AL = FFh if successful
BH = major DOS version
BL = minor DOS version
CH = DOS version flag
CL = OEM number
DH = major DR DOS version number (FFh if unknown)
DL = minor DR DOS version number (FFh if unknown)
Program: FREEVER is an AMIS-conformant freeware DOS version-faking TSR similar
to SETVER for any DOS-compatible OS, written by Matthias Paul
SeeAlso: INT 2D/AL=13h"FREEVER",INT 2D/AL=14h"FREEVER",INT 2D/AL=17h"FREEVER"
--------s-2D--13-----------------------------
INT 2D - CDTSR - ENABLE POPUP
AL = 13h
AH = AMIS multiplex number for CDTSR
Return: nothing
Program: CDTSR is a resident audio CD player by Colin Hill
SeeAlso: INT 2D/AL=10h"CDTSR",INT 2D/AL=11h"CDTSR",INT 2D/AL=12h"CDTSR"
--------U-2D--13-----------------------------
INT 2D - FREEVER - SET VERSION NUMBERS
AL = 13h
AH = AMIS multiplex number for FREEVER
BH = new major DOS version
BL = new minor DOS version
CH = new DOS version flag
CL = new DOS revision number
DH = new OEM number
SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=15h"FREEVER",INT 2D/AL=17h"FREEVER"
--------U-2D--14-----------------------------
INT 2D - FREEVER - ENABLE TSR
AL = 14h
AH = AMIS multiplex number for FREEVER
Return: AL = FFh if successful
SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=15h"FREEVER",INT 2D/AL=16h"FREEVER"
--------U-2D--15-----------------------------
INT 2D - FREEVER - DISABLE TSR
AL = 15h
AH = AMIS multiplex number for FREEVER
Return: AL = FFh if successful
SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=14h"FREEVER",INT 2D/AL=16h"FREEVER"
--------U-2D--16-----------------------------
INT 2D - FREEVER - GET TSR STATUS
AL = 16h
AH = AMIS multiplex number for FREEVER
Return: AL = FFh if successful
BL = status
01h resident and active
02h resident and inactive
SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=15h"FREEVER",INT 2D/AL=17h"FREEVER"
--------U-2D--17-----------------------------
INT 2D - FREEVER - GET TaskMAX STATUS AT INSTALLATION
AL = 17h
AH = AMIS multiplex number for FREEVER
Return: AL = FFh if successful
BL = status
00h if TaskMAX not loaded before SETDRVER
FFh if TaskMAX was loaded before SETDRVER
Program: FREEVER is an AMIS-conformant freeware DOS version-faking TSR similar
to SETVER for any DOS-compatible OS, written by Matthias Paul
SeeAlso: INT 2D/AL=12h"FREEVER",INT 2D/AL=14h"FREEVER",INT 2D/AL=16h"FREEVER"
--------U-2D--20-----------------------------
INT 2D - DTown Utilities v1.40+ - GET POP-UP HANDLER ADDRESS
AL = 20h
Return: AL = FFh if available
DX:DI -> DTU popup-handler
Program: DTown Utilities is a freeware programmer's utility TSR by Jeroen van
Disseldorp
Note: this function is only available if the extended API has been installed
in the resident portion
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=21h,INT 2D/AL=50h,INT 2D/AL=51h
SeeAlso: INT 03"DTown"
--------U-2D--21-----------------------------
INT 2D - DTown Utilities v1.40+ - POP UP
AL = 21h
BL = which utility to bring up
00h active utility
01h help screen
0Ah ASCII table
0Bh memory view
0Ch CPU status
0Dh calculator
0Eh miscellaneous
0Fh file viewer
10h disassembler
Return: AL = status
00h already active
FFh popped up successfully
BX = 0000h
Note: this function is only available if the extended API has been installed
in the resident portion
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h,INT 2D/AL=50h
--------U-2D--50-----------------------------
INT 2D - DTown Utilities v1.40+ - MEMORY VIEW SET ADDRESS
AL = 50h
CX:DX = new address for start of memory view utility's display
Note: this function is only available if the extended API has been installed
in the resident portion
Return: AL = FFh if supported
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h,INT 2D/AL=21h,INT 2D/AL=51h
--------U-2D--51-----------------------------
INT 2D - DTown Utilities v1.40+ - MEMORY VIEW SET REFERENCE
AL = 51h
BL = reference ("bookmark") number
CX:DX = new address for reference
Return: AL = status
00h invalid index
FFh reference set
Note: this function is only available if the extended API has been installed
in the resident portion
Program: DTown Utilities is a shareware programmer's utility TSR by Jeroen van
Disseldorp
SeeAlso: INT 2D/AL=10h"DTown",INT 2D/AL=20h,INT 2D/AL=50h
--------b-2D--DC-----------------------------
INT 2D C - DAISY.SYS - BROADCAST: CHAIN RESCANNED
AL = DCh
AH = AMIS multiplex number for signature 'DAISYCHA' 'INDRIVER'
DL = LPT Port Rescanned
Program: DAISY.SYS is a daisy chain manager for parallel port peripherals
conforming to the IEEE 1284.3 Committee's daisy chain specification.
Desc: This Broadcast is sent whenever daisy chain IDs are reassigned to
warn parallel port device drivers that their daisy chain ID may
have been changed.
Note: This function is a callout from DAISY.SYS, NOT a call into DAISY.SYS
SeeAlso: INT 17/AX=0200h"Enhanced Parallel Port",#00633,#02570
--------l-2E---------------------------------
INT 2E U - DOS 2+ - PASS COMMAND TO COMMAND INTERPRETER FOR EXECUTION
DS:SI -> commandline to execute (see #02585)
Return: all registers except CS:IP destroyed
AX = status (4DOS v4.0)
0000h successful
FFFFh error before processing command (not enough memory, etc)
other error number returned by command
Notes: this call allows execution of arbitrary commands (including COMMAND.COM
internal commands) without loading another copy of COMMAND.COM
if COMMAND.COM is the user's command interpreter, the primary copy
executes the command; this allows the master environment to be
modified by issuing a "SET" command, but changes in the master
environment will not become effective until all programs descended
from the primary COMMAND.COM terminate
since COMMAND.COM processes the string as if typed from the keyboard,
the transient portion needs to be present, and the calling program
must ensure that sufficient memory to load the transient portion can
be allocated by DOS if necessary
results are unpredictable if invoked by a program run from a batch file
because this call is not reentrant and COMMAND.COM uses the same
internal variables when processing a batch file
hooked but ignored by 4DOS v3.0 COMMAND.COM replacement unless SHELL2E
has been loaded
the MS-DOS 5 Programmer's Reference calls this "Reload Transient"
Format of DOS commandline:
Offset Size Description (Table 02585)
00h BYTE length of command string, not counting trailing CR
01h var command string
N BYTE 0Dh (CR)
--------O-2E---------------------------------
INT 2E UP - Windows NT - NATIVE API
EAX = function number (see #02586)
EDX = address of parameter block
Return: ???
(Table 02586)
Values for Windows NT NTOS function number:
000h AcceptConnectPort (24 bytes of parameters)
001h AccessCheck (32 bytes of parameters)
002h AccessCheckAndAuditAlarm (44 bytes of parameters)
003h AddAtom (8 bytes of parameters)
004h AdjustGroupsToken (24 bytes of parameters)
005h AdjustPrivilegesToken (24 bytes of parameters)
006h AlertResumeThread (8 bytes of parameters)
007h AlertThread (4 bytes of parameters)
008h AllocateLocallyUniqueId (4 bytes of parameters)
009h AllocateUuids (12 bytes of parameters)
00Ah AllocateVirtualMemory (24 bytes of parameters)
00Bh CallbackReturn (12 bytes of parameters)
00Ch CancelIoFile (8 bytes of parameters)
00Dh CancelTimer (8 bytes of parameters)
00Eh ClearEvent (4 bytes of parameters)
00Fh Close (4 bytes of parameters)
010h CloseObjectAuditAlarm (12 bytes of parameters)
011h CompleteConnectPort (4 bytes of parameters)
012h ConnectPort (32 bytes of parameters)
013h Continue (8 bytes of parameters)
014h CreateDirectoryObject (12 bytes of parameters)
015h CreateEvent (20 bytes of parameters)
016h CreateEventPair (12 bytes of parameters)
017h CreateFile (44 bytes of parameters)
018h CreateIoCompletion (16 bytes of parameters)
019h CreateKey (28 bytes of parameters)
01Ah CreateMailslotFile (32 bytes of parameters)
01Bh CreateMutant (16 bytes of parameters)
01Ch CreateNamedPipeFile (56 bytes of parameters)
01Dh CreatePagingFile (16 bytes of parameters)
01Eh CreatePort (20 bytes of parameters)
01Fh CreateProcess (32 bytes of parameters)
020h CreateProfile (36 bytes of parameters)
021h CreateSection (28 bytes of parameters)
022h CreateSemaphore (20 bytes of parameters)
023h CreateSymbolicLinkObject (16 bytes of parameters)
024h CreateThread (32 bytes of parameters)
025h CreateTimer (16 bytes of parameters)
026h CreateToken (52 bytes of parameters)
027h DelayExecution (8 bytes of parameters)
028h DeleteAtom (4 bytes of parameters)
029h DeleteFile (4 bytes of parameters)
02Ah DeleteKey (4 bytes of parameters)
02Bh DeleteObjectAuditAlarm (12 bytes of parameters)
02Ch DeleteValueKey (8 bytes of parameters)
02Dh DeviceIoControlFile (40 bytes of parameters)
02Eh DisplayString (4 bytes of parameters)
02Fh DuplicateObject (28 bytes of parameters)
030h DuplicateToken (24 bytes of parameters)
031h EnumerateKey (24 bytes of parameters)
032h EnumerateValueKey (24 bytes of parameters)
033h ExtendSection (8 bytes of parameters)
034h FindAtom (8 bytes of parameters)
035h FlushBuffersFile (8 bytes of parameters)
036h FlushInstructionCache (12 bytes of parameters)
037h FlushKey (4 bytes of parameters)
038h FlushVirtualMemory (16 bytes of parameters)
039h FlushWriteBuffer (no parameters)
03Ah FreeVirtualMemory (16 bytes of parameters)
03Bh FsControlFile (40 bytes of parameters)
03Ch GetContextThread (8 bytes of parameters)
03Dh GetPlugPlayEvent (16 bytes of parameters)
03Eh GetTickCount (no parameters)
03Fh ImpersonateClientOfPort (8 bytes of parameters)
040h ImpersonateThread (12 bytes of parameters)
041h InitializeRegistry (4 bytes of parameters)
042h ListenPort (8 bytes of parameters)
043h LoadDriver (4 bytes of parameters)
044h LoadKey (8 bytes of parameters)
045h LoadKey2 (12 bytes of parameters)
046h LockFile (40 bytes of parameters)
047h LockVirtualMemory (16 bytes of parameters)
048h MakeTemporaryObject (4 bytes of parameters)
049h MapViewOfSection (40 bytes of parameters)
04Ah NotifyChangeDirectoryFile (36 bytes of parameters)
04Bh NotifyChangeKey (40 bytes of parameters)
04Ch OpenDirectoryObject (12 bytes of parameters)
04Dh OpenEvent (12 bytes of parameters)
04Eh OpenEventPair (12 bytes of parameters)
04Fh OpenFile (24 bytes of parameters)
050h OpenIoCompletion (12 bytes of parameters)
051h OpenKey (12 bytes of parameters)
052h OpenMutant (12 bytes of parameters)
053h OpenObjectAuditAlarm (48 bytes of parameters)
054h OpenProcess (16 bytes of parameters)
055h OpenProcessToken (12 bytes of parameters)
056h OpenSection (12 bytes of parameters)
057h OpenSemaphore (12 bytes of parameters)
058h OpenSymbolicLinkObject (12 bytes of parameters)
059h OpenThread (16 bytes of parameters)
05Ah OpenThreadToken (16 bytes of parameters)
05Bh OpenTimer (12 bytes of parameters)
05Ch PlugPlayControl (16 bytes of parameters)
05Dh PrivilegeCheck (12 bytes of parameters)
05Eh PrivilegedServiceAuditAlarm (20 bytes of parameters)
05Fh PrivilegeObjectAuditAlarm (24 bytes of parameters)
060h ProtectVirtualMemory (20 bytes of parameters)
061h PulseEvent (8 bytes of parameters)
062h QueryInformationAtom (20 bytes of parameters)
063h QueryAttributesFile (8 bytes of parameters)
064h QueryDefaultLocale (8 bytes of parameters)
065h QueryDirectoryFile (44 bytes of parameters)
066h QueryDirectoryObject (28 bytes of parameters)
067h QueryEaFile (36 bytes of parameters)
068h QueryEvent (20 bytes of parameters)
069h QueryFullAttributesFile (8 bytes of parameters)
06Ah QueryInformationFile (20 bytes of parameters)
06Bh QueryIoCompletion (20 bytes of parameters)
06Ch QueryInformationPort (20 bytes of parameters)
06Dh QueryInformationProcess (20 bytes of parameters)
06Eh QueryInformationThread (20 bytes of parameters)
06Fh QueryInformationToken (20 bytes of parameters)
070h QueryIntervalProfile (8 bytes of parameters)
071h QueryKey (20 bytes of parameters)
072h QueryMultipleValueKey (24 bytes of parameters)
073h QueryMutant (20 bytes of parameters)
074h QueryObject (20 bytes of parameters)
075h QueryOleDirectoryFile (44 bytes of parameters)
076h QueryPerformanceCounter (8 bytes of parameters)
077h QuerySection (20 bytes of parameters)
078h QuerySecurityObject (20 bytes of parameters)
079h QuerySemaphore (20 bytes of parameters)
07Ah QuerySymbolicLinkObject (12 bytes of parameters)
07Bh QuerySystemEnvironmentValue (16 bytes of parameters)
07Ch QuerySystemInformation (16 bytes of parameters)
07Dh QuerySystemTime (4 bytes of parameters)
07Eh QueryTimer (20 bytes of parameters)
07Fh QueryTimerResolution (12 bytes of parameters)
080h QueryValueKey (24 bytes of parameters)
081h QueryVirtualMemory (24 bytes of parameters)
082h QueryVolumeInformationFile (20 bytes of parameters)
083h QueueApcThread (20 bytes of parameters)
084h RaiseException (12 bytes of parameters)
085h RaiseHardError (24 bytes of parameters)
086h ReadFile (36 bytes of parameters)
087h ReadFileScatter (36 bytes of parameters)
088h ReadRequestData (24 bytes of parameters)
089h ReadVirtualMemory (20 bytes of parameters)
08Ah RegisterThreadTerminatePort (4 bytes of parameters)
08Bh ReleaseMutant (8 bytes of parameters)
08Ch ReleaseSemaphore (12 bytes of parameters)
08Dh RemoveIoCompletion (20 bytes of parameters)
08Eh ReplaceKey (12 bytes of parameters)
08Fh ReplyPort (8 bytes of parameters)
090h ReplyWaitReceivePort (16 bytes of parameters)
091h ReplyWaitReplyPort (8 bytes of parameters)
092h RequestPort (8 bytes of parameters)
093h RequestWaitReplyPort (12 bytes of parameters)
094h ResetEvent (8 bytes of parameters)
095h RestoreKey (12 bytes of parameters)
096h ResumeThread (8 bytes of parameters)
097h SaveKey (8 bytes of parameters)
098h SetIoCompletion (20 bytes of parameters)
099h SetContextThread (8 bytes of parameters)
09Ah SetDefaultHardErrorPort (4 bytes of parameters)
09Bh SetDefaultLocale (8 bytes of parameters)
09Ch SetEaFile (16 bytes of parameters)
09Dh SetEvent (8 bytes of parameters)
09Eh SetHighEventPair (4 bytes of parameters)
09Fh SetHighWaitLowEventPair (4 bytes of parameters)
0A0h ??? (??? bytes of parameters)
0A1h SetInformationFile (20 bytes of parameters)
0A2h SetInformationKey (16 bytes of parameters)
0A3h SetInformationObject (16 bytes of parameters)
0A4h SetInformationProcess (16 bytes of parameters)
0A5h SetInformationThread (16 bytes of parameters)
0A6h SetInformationToken (16 bytes of parameters)
0A7h SetIntervalProfile (8 bytes of parameters)
0A8h SetLdtEntries (24 bytes of parameters)
0A9h SetLowEventPair (4 bytes of parameters)
0AAh SetLowWaitHighEventPair (4 bytes of parameters)
0ABh ??? (??? bytes of parameters)
0ACh SetSecurityObject (12 bytes of parameters)
0ADh SetSystemEnvironmentValue (8 bytes of parameters)
0AEh SetSystemInformation (12 bytes of parameters)
0AFh SetSystemPowerState (12 bytes of parameters)
0B0h SetSystemTime (8 bytes of parameters)
0B1h SetTimer (28 bytes of parameters)
0B2h SetTimerResolution (12 bytes of parameters)
0B3h SetValueKey (24 bytes of parameters)
0B4h SetVolumeInformationFile (20 bytes of parameters)
0B5h ShutdownSystem (4 bytes of parameters)
0B6h SignalAndWaitForSingleObject (16 bytes of parameters)
0B7h StartProfile (4 bytes of parameters)
0B8h StopProfile (4 bytes of parameters)
0B9h SuspendThread (8 bytes of parameters)
0BAh SystemDebugControl (24 bytes of parameters)
0BBh TerminateProcess (8 bytes of parameters)
0BCh TerminateThread (8 bytes of parameters)
0BDh TestAlert (no parameters)
0BEh UnloadDriver (4 bytes of parameters)
0BFh UnloadKey (4 bytes of parameters)
0C0h UnlockFile (20 bytes of parameters)
0C1h UnlockVirtualMemory (16 bytes of parameters)
0C2h UnmapViewOfSection (8 bytes of parameters)
0C3h VdmControl (8 bytes of parameters)
0C4h WaitForMultipleObjects (20 bytes of parameters)
0C5h WaitForSingleObject (12 bytes of parameters)
0C6h WaitHighEventPair (4 bytes of parameters)
0C7h WaitLowEventPair (4 bytes of parameters)
0C8h WriteFile (36 bytes of parameters)
0C9h WriteFileGather (36 bytes of parameters)
0CAh WriteRequestData (24 bytes of parameters)
0CBh WriteVirtualMemory (20 bytes of parameters)
0CCh W32Call (20 bytes of parameters)
0CDh CreateChannel (8 bytes of parameters)
0CEh ListenChannel (8 bytes of parameters)
0CFh OpenChannel (8 bytes of parameters)
0D0h ReplyWaitSendChannel (12 bytes of parameters)
0D1h SendWaitReplyChannel (16 bytes of parameters)
0D2h SetContextChannel (4 bytes of parameters)
0D3h YieldExecution (no parameters)
--------l-2E----BXE22E-----------------------
INT 2E - 4DOS v2.x-3.03 SHELL2E.COM - UNINSTALL
BX = E22Eh
DS:SI -> zero byte
Return: if successful, SHELL2E terminates itself with INT 21/AH=4Ch
----------2F---------------------------------
INT 2F - Multiplex - NOTES
AH = identifier of program which is to handle the interrupt
00h-3Fh reserved for IBM (for DOS)
40h-7Fh reserved for Microsoft (for DOS)
80h-B7h reserved for IBM
B8h-BFh reserved for networks
C0h-FFh reserved for applications
AL is the function code
This is a general mechanism for verifying the presence of a TSR and
communicating with it. When searching for a free identifier code for AH
using the installation check (AL=00h), the calling program should set
BX/CX/DX to 0000h and must not depend on any registers other than CS:IP
and SS:SP to be valid on return, since numerous programs now use additional
registers on input and/or output for the installation check.
Notes: Since the multiplex chain is growing so long, and beginning to
experience multiplex number collisions, I have proposed an alternate
multiplex interrupt on INT 2D. If you decide to use the alternate
multiplex, please let me know.
DOS and some other programs return values in the flags register, so
any TSR which chains by calling the previous handler rather than
jumping to it should ensure that the returned flags are preserved
and passed back to the original caller
SeeAlso: INT 2D"ALTERNATE MULTIPLEX"
--------t-2F---------------------------------
INT 2F - BMB Compuscience Canada Utilities Interface - INSTALLATION CHECK
AH = xx (dynamically assigned based upon a search for a multiplex
number which doesn't answer installed)
AL = 00h installation check
ES:DI = EBEBh:BEBEh
Return: AL = 00h not installed
01h not installed, not OK to install
FFh installed; if ES:DI was EBEBh:BEBEh on entry, ES:DI will point
to a string of the form 'MMMMPPPPPPPPvNNNN' where MMMM is a
short form of the manufacturer's name, PPPPPPPP is a product
name and NNNN is the product's version number
--------t-2F---------------------------------
INT 2F - Ross Wentworth's Turbo Pascal POPUP LIBRARY
AH = programmer-selected multiplex number
AL = function
00h installation check
Return: AL = FFh if installed
01h get TSR interrupt vectors
Return: DX:AX -> vector table (see #02587)
02h get TSR code segment
Return: AX = code segment for all interrupt handlers
03h call user exit routine and release TSR's memory
04h get signature string
Return: DX:AX -> counted string containing signature
05h get TSR's INT 2F handler
Return: DX:AX -> INT 2F handler
06h enable/disable TSR
BL = new state (00h disabled, 01h enabled)
07h activate TSR (popup if not disabled)
08h get hotkeys
BL = which hotkey (00h = hotkey 1, 01h = hotkey 2)
Return: AX = hotkey (AH = keyflags, AL = scancode)
09h set hotkey
BL = which hotkey (00h = hotkey 1, 01h = hotkey 2)
CX = new hotkey (CH = keyflags, CL = scancode)
0Ah-1Fh reserved
Index: installation check;Ross Wentworth POPUP library
Index: hotkeys;Ross Wentworth POPUP library
Format of POPUP vector table entry:
Offset Size Description (Table 02587)
00h BYTE vector number (00h = end of table)
01h DWORD original vector
05h WORD offset of interrupt handler in TSR's code segment
--------t-2F---------------------------------
INT 2F - CiriSOFT Spanish University of Valladolid TSR's Interface
AH = xx (dynamically assigned based upon a search for a multiplex
number from C0h to FFh which doesn't answer installed)
AL = 00h installation check
ES:DI = 1492h:1992h
Return: AL = 00h not installed
01h not installed, not OK to install
FFh installed; and if ES:DI was 1492h:1992h on entry, ES:DI will
point to author_name_ver table (see #02588)
AH = FFh
Note: this interface permits advanced communication with TSRs: it is possible
to make a generic uninstall utility, advanced TSR relocator programs
in order to fit fragmented memory areas, etc.
See also: INT 2D"AMIS",INT 2F"Compuscience"
Index: installation check;CiriSOFT TSR interface
Index: uninstall;CiriSOFT TSR interface
Format of CiriSOFT author_name_ver table:
Offset Size Description (Table 02588)
-16 WORD segment of the start of the resident TSR code (CS in programs
with PSP, XMS upper memory segment if installed as UMB...)
-14 WORD offset of the start of the resident TSR code (frequently 100h
in *.COM programs and 0 in upper memory TSR's).
-12 WORD memory used by TSR (in paragraphs). Knowing the memory area
used by TSR is possible to determine if hooked vectors are
still pointing it (and if it is safe to uninstall).
-10 BYTE characteristics byte (see #02589)
-9 BYTE number of multiplex entry used (redefinition available). Note
that the TSR must use THIS variable in it's INT 2Fh handler.
-8 WORD offset to vector_area table (see #02590)
-6 WORD offset to extra_area table (see #02591,#02589 [bit 7])
-4 4 BYTEs signature string "*##*"
00h var "AUTHOR:PROGRAM_NAME:VERSION",0 (variable length, this area
is used in order to determine if the TSR is already resident
and it's version code; the ':' char is used as delimiter)
Bitfields for CiriSOFT characteristics byte:
Bit(s) Description (Table 02589)
0-2 type
000 normal program (with PSP)
001 upper XMS memory block (needed HIMEM.SYS function to free memory
when uninstalling)
010 device driver (*.SYS)
011 device driver in EXE format
1xx others (reserved)
3-6 reserved
7 set if extra_table defined and supported (see #02591)
SeeAlso: #02588
Format of CiriSOFT vector_area table:
Offset Size Description (Table 02590)
-1 BYTE number of vectors intercepted by TSR
00h BYTE first vector number
01h DWORD first vector pointer before installing the TSR
05h BYTE second vector number
06h DWORD second vector pointer before installing the TSR
0Ah ... (and so on)
Note: the TSR must use these variables to invoke the previous interrupt
handler routines
SeeAlso: #02588
Format of extra_area table (needed only to improve relocation feature):
Offset Size Description (Table 02591)
00h WORD offset to external_ctrl table (see #02592)
0000h if not supported
02h WORD reserved for future use (0)
SeeAlso: #02588
Format of CiriSOFT external_ctrl table:
Offset Size Description (Table 02592)
00h BYTE bit 0: TSR is relocatable (no absolute segment references)
01h WORD offset to a variable which can activate/inhibit the TSR
---And if bit 0 in offset 00h is off:
03h DWORD pointer to ASCIZ pathname for executable file which supports
/SR parameter (silent installation & inhibit)
07h DWORD pointer to first variable to initialize on the copy reloaded
from the previous TSR still resident
0Bh DWORD pointer to last variable (all variables packed in one block)
--------c-2F00-------------------------------
INT 2F U - DOS 2.x only PRINT.COM - SUBMIT FILE FOR PRINTING
AH = 00h
DS:DX -> opened FCB (see #01345 at INT 21/AX=0Fh)
Return: AH = number of files currently in print queue
AL = status
00h file successfully added
01h queue is full
ES:BX -> print queue (10 FCBs; first byte of FFh indicates unused)
ES:DX -> currently-printing FCB (if DX=FFFFh, none printing)
Notes: DOS 2.x PRINT.COM does not chain to previous INT 2F handler
values in AH other than 00h or 01h cause PRINT to return the number of
files in the queue in AH
SeeAlso: AH=01h"PRINT",AX=0102h
--------P-2F00-------------------------------
INT 2F U - PSPRINT - PRINT JOB CONTROL
AH = 00h
???
Return: ???
--------c-2F0080-----------------------------
INT 2F - DOS 3.1+ PRINT - GIVE PRINT A TIME SLICE
AX = 0080h
Return: after PRINT executes
Notes: PRINT returns AL=01h if AH=00h but AL is not 80h on entry
this function is not supported by the Novell DOS 7 PRINT.COM
--------N-2F00D8-----------------------------
INT 2F - Personal NetWare - VLM - ???
AX = 00D8h
???
Return: ???
Note: hooked by one of the .VLMs loaded by VLM.EXE v1.10, but apparently a
NOP
--------c-2F01-------------------------------
INT 2F U - DOS 2.x only PRINT.COM - REMOVE FILE FROM PRINT QUEUE
AH = 01h
DS:DX -> FCB (see #01345 at INT 21/AH=0Fh) for file to be canceled
Return: AH = number of files currently in print queue
AL = 00h (successful)
ES:BX -> print queue (10 FCBs; first byte of FFh indicates unused)
ES:DX -> currently-printing FCB (if DX=FFFFh, none printing)
Notes: DOS 2.x PRINT.COM does not chain to previous INT 2F handler
values in AH other than 00h or 01h cause PRINT to return the number of
files in the queue in AH
SeeAlso: AH=00h"PRINT.COM",AX=0103h
--------c-2F0100-----------------------------
INT 2F - DOS 3.0+ PRINT - INSTALLATION CHECK
AX = 0100h
Return: AL = status
00h not installed
01h not installed, but not OK to install
FFh installed
AH = 00h (Novell DOS 7)
SeeAlso: AX=0101h
--------c-2F0100SI20D6-----------------------
INT 2F U - PrintCache 3.1 PRINT.COM - INSTALLATION CHECK
AX = 0100h
SI = 20D6h
DI = 8761h
Return: AX = 00FFh if installed
DI = 0001h if PrintCache's PRINT.COM installed and magic values match
SI = resident code segment
Program: PrintCache PRINT.COM is a DOS PRINT replacement included in
LaserTools' PrintCache memory/disk-based print spooler package
Note: if either of SI or DI differ from the indicated magic values, only AX
will be modified on return, for compatibility with DOS PRINT
SeeAlso: AX=0101h/SI=20D6h,AX=C000h"PCACHE"
--------c-2F0101-----------------------------
INT 2F - DOS 3.0+ PRINT - SUBMIT FILE FOR PRINTING
AX = 0101h
DS:DX -> submit packet (see #02593)
Return: CF clear if successful
AL = status
01h added to queue
9Eh now printing
CF set on error
AX = error code (see #02594,#01680 at INT 21/AH=59h/BX=0000h)
SeeAlso: AX=0102h
Format of PRINT submit packet:
Offset Size Description (Table 02593)
00h BYTE level (must be 00h)
01h DWORD pointer to ASCIZ filename (no wildcards)
(Table 02594)
Values for PRINT error code:
0001h invalid function
0002h file not found
0003h path not found
0004h out of file handles
0005h access denied
0008h print queue full
0009h spooler busy
000Ch name too long
000Fh invalid drive
--------c-2F0101SI20D6-----------------------
INT 2F U - PrintCache v3.1 PRINT.COM - SUBMIT FILE FOR PRINTING
AX = 0101h
SI = 20D6h
DI = 8761h
DS:DX -> submit packet (see #02593)
CL = print options
bit 4: use default options
Return: CF clear if successful
AL = status
01h added to queue
9Eh now printing
CF set on error
AX = error code (see #02594)
Program: PrintCache PRINT.COM is a DOS PRINT replacement included in
LaserTools' PrintCache memory/disk-based print spooler package
Note: if either SI or DI differs from the indicated magic values on entry,
PrintCache will use the default print options for the file for
compatibility with DOS PRINT
SeeAlso: AX=0100h/SI=20D6h,AX=0101h,AH=00h"PRINT",AX=0107h"PrintCache"
--------c-2F0102-----------------------------
INT 2F - DOS 3.0+ PRINT - REMOVE FILE FROM PRINT QUEUE
AX = 0102h
DS:DX -> ASCIZ filename (wildcards allowed)
Return: CF clear if successful
CF set on error
AX = error code (see #02594)
SeeAlso: AX=0101h,AX=0103h,AH=01h"PRINT"
--------c-2F0103-----------------------------
INT 2F - DOS 3.0+ PRINT - CANCEL ALL FILES IN PRINT QUEUE
AX = 0103h
Return: CF clear if successful
CF set on error
AX = error code (see #02594)
SeeAlso: AX=0102h
--------c-2F0104-----------------------------
INT 2F - DOS 3.0+ PRINT - FREEZE PRINT QUEUE TO READ JOB STATUS
AX = 0104h
Return: CF clear if successful
DX = error count since status last read
DS:SI -> print queue
CF set on error
AX = error code (see #02594)
Desc: get the list of print jobs, temporarily suspending PRINT's activities
to avoid changing the list while it is being examined
Notes: the print queue is an array of 64-byte ASCIZ filenames terminated by
an empty filename; the first name is the file currently being printed
printing is stopped until AX=0105h is called to prevent the queue
from changing while the filenames are being read
SeeAlso: AX=0101h,AX=0105h
--------c-2F0105-----------------------------
INT 2F - DOS 3.0+ PRINT - RESTART PRINT QUEUE AFTER STATUS READ
AX = 0105h
Return: CF clear if successful
CF set on error
AX = error code (see #02594)
Desc: restart PRINT's activities once an application finishes examining the
print queue
SeeAlso: AX=0104h
--------c-2F0106-----------------------------
INT 2F - DOS 3.3+ PRINT - GET PRINTER DEVICE
AX = 0106h
Return: CF set if files in print queue
AX = error code 0008h (queue full)
DS:SI -> device driver header (see #01646)
CF clear if print queue empty
AX = 0000h
Desc: determine which device, if any, PRINT is currently using for output
Notes: undocumented prior to the release of MS-DOS 5.0
this function can be used to allow a program to avoid printing to the
printer on which PRINT is currently performing output
SeeAlso: AX=0104h
--------c-2F0107-----------------------------
INT 2F U - PrintCache v3.1 PRINT.COM - SET TRAILING FORM FEEDS
AX = 0107h
CL bit 0: output form feed between print jobs
Return: AL destroyed
SeeAlso: AX=0100h/SI=20D6h,AX=0101h/SI=20D6h
--------N-2F0200-----------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - INSTALLATION CHECK
AX = 0200h
Return: AL = FFh if installed
Desc: determine whether the PC LAN Program redirector is installed
SeeAlso: AX=0201h,AX=0203h
--------N-2F0201-----------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 0201h
Return: nothing???
Notes: this function is called by the DOS 3.3+ PRINT.COM
AX=0202h appears to be the opposite function
these functions are supposedly used to signal opening and closing of
printers
SeeAlso: AX=0202h
--------N-2F0202-----------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 0202h
???
Return: nothing???
Notes: this function is called by the DOS 3.3+ PRINT.COM
these functions are supposedly used to signal opening and closing of
printers
SeeAlso: AX=0201h
--------N-2F0203-----------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 0203h
Return: nothing???
Notes: this function is called by the DOS 3.3+ PRINT.COM
AX=0204h appears to be the opposite function
these functions are supposedly used to signal opening and closing of
printers
SeeAlso: AX=0200h,AX=0204h
--------N-2F0204-----------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 0204h
???
Return: nothing???
Notes: this function is called by the DOS 3.3+ PRINT.COM
AX=0203h appears to be the opposite function
these functions are supposedly used to signal opening and closing of
printers
SeeAlso: AX=0200h,AX=0203h
--------N-2F---------------------------------
INT 2F U - PC LAN PROGRAM REDIR/REDIRIFS internal - ???
AX = 02xxh
???
Return: ???
--------l-2F0500-----------------------------
INT 2F U - DOS 3.0+ CRITICAL ERROR HANDLER - INSTALLATION CHECK
AX = 0500h
Return: AL = status
00h not installed, OK to install
01h not installed, can't install
FFh installed
BX destroyed (MSCDEX v2.21-2.25)
CF clear (MSCDEX v2.21-2.25)
Desc: determine whether a critical error message override is installed
Note: this set of functions allows a user program to partially or completely
override the default critical error handler's message in COMMAND.COM
SeeAlso: AH=05h,INT 24
--------l-2F05-------------------------------
INT 2F CU - DOS 3.0+ CRITICAL ERROR HANDLER - EXPAND ERROR INTO STRING
AH = 05h
---DOS 3.x---
AL = extended error code (not zero)
---DOS 4.0+ ---
AL = error type
01h DOS extended error code
02h parameter error
BX = error code
Return: CF clear if successful
ES:DI -> ASCIZ error message (read-only)
AL = completion state
00h message requires completion with device name, drive, etc.
01h message is complete as returned
CF set if error code can't be converted to string
AX,DI,ES destroyed
other flags corrupted
Notes: called at start of COMMAND.COM's default critical error handler if
installed by a user program, allowing partial or complete overriding
of the default error messages
subfunction 02h is called by many DOS 4 external programs
DR DOS's COMMAND.COM appends additional info ("0 files copied") to the
returned string
SeeAlso: AX=0500h,AX=122Eh,INT 24
--------U-2F0600-----------------------------
INT 2F - DOS 3.0+ ASSIGN - INSTALLATION CHECK
AX = 0600h
Return: AL = status
00h not installed
01h not installed, but not OK to install
FFh installed
Notes: ASSIGN is not a TSR in DR DOS 5.0; it is internally replaced by SUBST
(see INT 21/AH=52h)
undocumented prior to the release of DOS 5.0
SeeAlso: AX=0601h,INT 21/AH=52h
--------U-2F0601-----------------------------
INT 2F U - DOS 3.0+ ASSIGN - GET DRIVE ASSIGNMENT TABLE
AX = 0601h
Return: ES = segment of ASSIGN work area and assignment table
Note: the 26 bytes starting at ES:0103h specify which drive each of A: to Z:
is mapped to. Initially set to 01h 02h 03h....
SeeAlso: AX=0600h,AX=AF14h"WinDOS"
--------D-2F0800-----------------------------
INT 2F U - DRIVER.SYS support - INSTALLATION CHECK
AX = 0800h
Return: AL = status
00h not installed, OK to install
01h not installed, not OK to install
FFh installed
Desc: determine whether the internal support code used by DRIVER.SYS is
present; it is always present in DOS 3.2+
Note: supported by DR DOS 5.0 and Novell DOS 7
--------D-2F0801-----------------------------
INT 2F U - DRIVER.SYS support - ADD NEW BLOCK DEVICE
AX = 0801h
DS:DI -> drive data table (see #02601,#02602,#02603)
Return: AX,BX,SI,ES destroyed
Notes: moves down internal list of drive data tables, copying and modifying
the drive description flags word for tables referencing same physical
drive
the data table is appended to the chain of tables
supported by DR DOS 5.0 and Novell DOS 7
SeeAlso: AX=0803h
--------D-2F0802-----------------------------
INT 2F U - DRIVER.SYS support - EXECUTE DEVICE DRIVER REQUEST
AX = 0802h
ES:BX -> device driver request header (see #02597)
Return: request header updated as per requested operation
STACK: WORD original flags from INT call (left by RETF in device
driver, at least in DOS 5.0-6.22)
Notes: supported by DR DOS 5.0
DOS 3.2 executes this function on any AL value from 02h through F7h;
DOS 4.0+ executes this function on AL=02h and AL=04h-F7h
the command codes (see #02595) and structures described below apply
to all drivers which support the appropriate commands; this call is
just one of a number of ways in which a device driver request may
be invoked
supported by Novell DOS 7
SeeAlso: AX=0800h,AX=0801h,AX=0803h,AX=1510h,INT 21/AH=52h,INT 21/AH=99h
SeeAlso: INT 21/AH=9Ah
(Table 02595)
Values for device driver command code:
00h (0) INIT
01h (1) MEDIA CHECK (block devices)
02h (2) BUILD BPB (block devices)
03h (3) IOCTL INPUT
04h (4) INPUT
05h (5) NONDESTRUCTIVE INPUT, NO WAIT (character devices)
06h (6) INPUT STATUS (character devices)
07h (7) INPUT FLUSH (character devices)
08h (8) OUTPUT
09h (9) OUTPUT WITH VERIFY
0Ah (10) OUTPUT STATUS (character devices)
0Bh (11) OUTPUT FLUSH (character devices)
0Ch (12) IOCTL OUTPUT
0Dh (13) (DOS 3.0+) DEVICE OPEN
0Eh (14) (DOS 3.0+) DEVICE CLOSE
0Fh (15) (DOS 3.0+) REMOVABLE MEDIA (block devices)
10h (16) (DOS 3.0+) OUTPUT UNTIL BUSY (character devices)
11h (17) (European MS-DOS 4.0) STOP OUTPUT (console screen drivers only)
12h (18) (European MS-DOS 4.0) RESTART OUTPUT (console screen drivers only)
13h (19) (DOS 3.2+) GENERIC IOCTL
14h (20) (DOS 4.0, KKCFUNC) DEVICE RESTORE (character device)
15h (21) (European MS-DOS 4.0) RESET UNCERTAIN MEDIA FLAG
16h (22) (DOS 4.0) unknown???
17h (23) (DOS 3.2+) GET LOGICAL DEVICE
18h (24) (DOS 3.2+) SET LOGICAL DEVICE
19h (25) (DOS 5.0+) CHECK GENERIC IOCTL SUPPORT
80h (128)(CD-ROM,DRFAT32) READ LONG
81h (129)(CD-ROM) reserved
82h (130)(CD-ROM,DRFAT32) READ LONG PREFETCH
83h (131)(CD-ROM,DRFAT32) SEEK
84h (132)(CD-ROM) PLAY AUDIO
85h (133)(CD-ROM) STOP AUDIO
86h (134)(CD-ROM,DRFAT32) WRITE LONG
87h (135)(CD-ROM,DRFAT32) WRITE LONG VERIFY
88h (136)(CD-ROM) RESUME AUDIO
Bitfields for device request status:
Bit(s) Description (Table 02596)
15 error
14-11 reserved
10 ??? set by DOS kernel on entry to some driver calls
9 busy
8 done (may be clear on return under European MS-DOS 4.0)
7-0 error code if bit 15 set (see #02598)
Format of device driver request header:
Offset Size Description (Table 02597)
00h BYTE length of request header
01h BYTE subunit within device driver
02h BYTE command code (see #02595)
03h WORD status (filled in by device driver) (see #02596)
---DOS---
05h 4 BYTEs reserved (unused in DOS 2.x and 3.x)
09h DWORD (European MS-DOS 4.0 only) pointer to next request header in
device's request queue
(other versions) reserved (unused in DOS 2.x and 3.x)
---STARLITE architecture---
05h DWORD pointer to next request header
09h 4 BYTEs reserved
---command code 00h---
0Dh BYTE (ret) number of units
0Eh DWORD (call) pointer to DOS device helper function (see #02599)
(European MS-DOS 4.0 only)
(call) pointer past end of memory available to driver (DOS 5+)
(ret) address of first free byte following driver
12h DWORD (call) pointer to commandline arguments
(ret) pointer to BPB array (block drivers) or
0000h:0000h (character drivers)
16h BYTE (DOS 3.0+) drive number for first unit of block driver (0=A)
---European MS-DOS 4.0---
17h DWORD pointer to function to save registers on stack
---DOS 5+ ---
17h WORD (ret) error-message flag
0001h MS-DOS should display error msg on init failure
---command code 01h---
0Dh BYTE media descriptor
0Eh BYTE (ret) media status
00h don't know
01h media has not changed
FFh media has been changed
0Fh DWORD (ret, DOS 3.0+) pointer to previous volume ID if the
OPEN/CLOSE/RM bit in device header is set and disk changed
Note: some drives (or controllers???) forget the change line
status if another drive is accessed afterwards. The
DOS IO.SYS layer takes care of this by not relying
on the reported change line status when the change
line is not active and a different drive is accessed,
instead it reports "don't know" to the DOS kernel.
---command code 02h---
0Dh BYTE media descriptor
0Eh DWORD transfer address
-> scratch sector if NON-IBM FORMAT bit in device header set
-> first FAT sector otherwise
12h DWORD pointer to BPB (set by driver) (see #01663 at INT 21/AH=53h)
---command codes 03h,0Ch---
(see also INT 21/AX=4402h"DOS 2+",INT 21/AX=4403h"DOS")
0Dh BYTE media descriptor (block devices only)
0Eh DWORD transfer address
12h WORD (call) number of bytes to read/write
(ret) actual number of bytes read or written
---command codes 04h,08h,09h (except Compaq DOS 3.31, DR DOS 6)---
0Dh BYTE media descriptor (block devices only)
0Eh DWORD transfer address
12h WORD byte count (character devices) or sector count (block devices)
14h WORD starting sector number (block devices only)
16h DWORD (DOS 3.0+) pointer to volume ID if error 0Fh returned
1Ah DWORD (DOS 4.0+) 32-bit starting sector number (block devices with
device attribute word bit 1 set only) if starting sector
number above is FFFFh (see INT 21/AH=52h)
---command codes 04h,08h,09h (Compaq DOS 3.31, DR DOS 6)---
0Dh BYTE media descriptor (block devices only)
0Eh DWORD transfer address
12h WORD byte count (character devices) or sector count (block devices)
14h DWORD 32-bit starting sector number (block devices only)
Note: to reliably determine which variant of the request block for
functions 04h,08h,09h has been passed to the driver, check
the length field as well as the word at offset 14h. If the
length is 1Eh and 14h=FFFFh, use the DWORD at 1Ah as the
starting sector number; if the length is 18h, use the DWORD
at 14h; otherwise, use the WORD at 14h.
---command code 05h---
0Dh BYTE byte read from device if BUSY bit clear on return
---command codes 06h,07h,0Ah,0Bh,0Dh,0Eh,0Fh---
no further fields
---command code 10h---
0Dh BYTE unused
0Eh DWORD transfer address
12h WORD (call) number of bytes to write
(ret) actual number of bytes written
---command codes 11h,12h---
0Dh BYTE reserved
---command code 14h---
no further fields
Note: This is at least true for KKCFUNC.SYS' "device restore".
KKCFUNC.SYS checks that INT 2Fh in the IVT still points
to KKCFUNC's own INT 2Fh entry point. In this case it
restores the original INT 2Fh vector, as recorded at device
init, into the IVT.
SeeAlso: INT 2F/AH=4Dh
---command code 15h---
no further fields
---command codes 13h,19h---
0Dh BYTE category code
00h-7Fh reserved for Microsoft
00h unknown
01h COMn: (serial) (DOS 3.3+)
02h reserved for terminal control
03h CON (DOS 3.3+)
04h reserved for keyboard control
05h LPTn:
07h mouse (European MS-DOS 4.0)
08h disk
48h FAT32 disk control (MS-DOS 7.10+)
80h-FFh reserved for OEM/user-defined
9Eh (STARLITE) Media Access Control driver
EDh (DR PalmDOS) login security
SeeAlso: #01558
0Eh BYTE function code
00h (STARLITE) MAC Bind request
0Fh WORD copy of DS at time of IOCTL call (apparently unused in DOS 3.3)
SI contents (European MS-DOS 4.0)
11h WORD offset of device driver header (see #01646)
DI contents (European MS-DOS 4.0)
13h DWORD pointer to parameter block from INT 21/AX=440Ch or AX=440Dh
---command codes 80h,82h---
0Dh BYTE addressing mode
00h HSG (default)
01h Phillips/Sony Red Book
0Eh DWORD transfer address (ignored for command 82h)
12h WORD number of sectors to read
(if 0 for command 82h, request is an advisory seek)
14h DWORD starting sector number
logical sector number in HSG mode
frame/second/minute/unused in Red Book mode
(HSG sector = minute * 4500 + second * 75 + frame - 150)
18h BYTE data read mode
00h cooked (2048 bytes per frame)
01h raw (2352 bytes per frame, including EDC/ECC)
19h BYTE interleave size (number of sectors stored consecutively)
1Ah BYTE interleave skip factor
(number of sectors between consecutive portions)
---command code 83h---
0Dh BYTE addressing mode
00h HSG (default)
01h Phillips/Sony Red Book
0Eh DWORD transfer address (ignored)
12h WORD number of sectors to read (ignored)
14h DWORD starting sector number (see also above)
---command code 84h---
0Dh BYTE addressing mode
00h HSG (default)
01h Phillips/Sony Red Book
0Eh DWORD starting sector number (see also above)
12h DWORD number of sectors to play
---command codes 85h,88h---
no further fields
---command codes 86h,87h---
0Dh BYTE addressing mode
00h HSG (default)
01h Phillips/Sony Red Book
0Eh DWORD transfer address (ignored in write mode 0)
12h WORD number of sectors to write
14h DWORD starting sector number (also see above)
18h BYTE write mode
00h mode 0 (write all zeros)
01h mode 1 (default) (2048 bytes per sector)
02h mode 2 form 1 (2048 bytes per sector)
03h mode 2 form 2 (2336 bytes per sector)
19h BYTE interleave size (number of sectors stored consecutively)
1Ah BYTE interleave skip factor
(number of sectors between consecutive portions)
(Table 02598)
Values for device driver error code:
00h write-protect violation
01h unknown unit
02h drive not ready
03h unknown command
04h CRC error
05h bad drive request structure length
06h seek error
07h unknown media
08h sector not found
09h printer out of paper
0Ah write fault
0Bh read fault
0Ch general failure
0Dh reserved
0Eh (CD-ROM) media unavailable
0Fh invalid disk change
(Table 02599)
Call European MS-DOS 4.0 device helper function with:
DL = function
00h "SchedClock" called on each timer tick
AL = tick interval in milliseconds
01h "DevDone" device I/O complete
ES:BX -> request header
Note: must update status word first; may be called from
an interrupt handler
02h "PullRequest" pull next request from queue
DS:SI -> DWORD pointer to start of device's request queue
Return: ZF clear if pending request
ES:BX -> request header
ZF set if no more requests
03h "PullParticular" remove specific request from queue
DS:SI -> DWORD pointer to start of device's request queue
ES:BX -> request header
Return: ZF set if request header not found
04h "PushRequest" push the request onto the queue
DS:SI -> DWORD pointer to start of device's request queue
ES:BX -> request header
interrupts disabled
05h "ConsInputFilter" keyboard input check
AX = character (high byte 00h if PC ASCII character)
Return: ZF set if character should be discarded
ZF clear if character should be handled normally
Note: called by keyboard interrupt handler so DOS can scan
for special input characters
06h "SortRequest" push request in sorted order by starting sector
DS:SI -> DWORD pointer to start of device's request queue
ES:BX -> request header
interrupts disabled
07h "SigEvent" send signal on keyboard event
AH = event identifier
Return: AL,FLAGS destroyed
09h "ProcBlock" block on event
AX:BX = event identifier (typically a pointer)
CX = timeout in ms or 0000h for never
DH = interruptable flag (nonzero if pause may be interrupted)
interrupts disabled
Return: after corresponding ProcRun call
CF clear if event wakeup, set if unusual wakeup
ZF set if timeout wakeup, clear if interrupted
AL = wakeup code, nonzero if unusual wakeup
interrupts enabled
BX,CX,DX destroyed
Note: block process and schedules another to run
0Ah "ProcRun" unblock process
AX:BX = event identifier (typically a pointer)
Return: AX = number of processes awakened
ZF set if no processes awakened
BX,CX,DX destroyed
0Bh "QueueInit" initialize/clear character queue
DS:BX -> character queue structure (see #02600)
Note: the queue size field must be set before calling
0Dh "QueueWrite" put a character in the queue
DS:BX -> character queue (see #02600)
AL = character to append to end of queue
Return: ZF set if queue is full
ZF clear if character stored
0Eh "QueueRead" get a character from the queue
DS:BX -> character queue (see #02600)
Return: ZF set if queue is empty
ZF clear if characters in queue
AL = first character in queue
10h "GetDOSVar" return pointer to DOS variable
AL = index of variable
03h current process ID
BX = index into variable if AL specifies an array
CX = expected length of variable
Return: CF clear if successful
DX:AX -> variable
CF set on error
AX,DX destroyed
BX,CX destroyed
Note: the variables may not be modified
14h "Yield" yield CPU if higher-priority task ready to run
Return: FLAGS destroyed
1Bh "CritEnter" begin system critical section
DS:BX -> semaphore (6 BYTEs, initialized to zero)
Return: AX,BX,CX,DX destroyed
1Ch "CritLeave" end system critical section
DS:BX -> semaphore (6 BYTEs, initialized to zero)
Return: AX,BX,CX,DX destroyed
Note: must be called in the context of the process which
called CritEnter on the semaphore
Note: the DWORD pointing at the request queue must be allocated by the driver
and initialized to 0000h:0000h. It always points at the next request
to be executed
Format of European MS-DOS 4.0 character queue:
Offset Size Description (Table 02600)
00h WORD size of queue in bytes
02h WORD index of next character out
04h WORD count of characters in the queue
06h N BYTEs queue buffer
--------D-2F0803-----------------------------
INT 2F U - DOS 4.0+ DRIVER.SYS support - GET DRIVE DATA TABLE LIST
AX = 0803h
Return: DS:DI -> first drive data table in list (see #02601,#02602,#02603)
Note: not available under DR DOS 5.0, but supported by Novell DOS 7 (using
the MS-DOS 4+ data table format)
SeeAlso: AX=0801h
Format of DOS 3.30 drive data table:
Offset Size Description (Table 02601)
00h DWORD pointer to next table (offset FFFFh if last table)
04h BYTE physical unit number (for INT 13)
05h BYTE logical drive number (0=A:)
06h 19 BYTEs BIOS Parameter Block (see also INT 21/AH=53h)
Offset Size Description
00h WORD bytes per sector
02h BYTE sectors per cluster, FFh if unknown
03h WORD number of reserved sectors
05h BYTE number of FATs
06h WORD number of root dir entries
08h WORD total sectors
0Ah BYTE media descriptor, 00h if unknown
0Bh WORD sectors per FAT
0Dh WORD sectors per track
0Fh WORD number of heads
11h WORD number of hidden sectors
19h BYTE flags
bit 6: 16-bit FAT instead of 12-bit FAT
1Ah WORD number of DEVICE OPEN calls without corresponding DEVICE CLOSE
1Ch 11 BYTEs volume label or "NO NAME " if none (always "NO NAME" for
fixed media)
27h BYTE terminating null for volume label???
28h BYTE device type (see #01561 at INT 21/AX=440Dh"DOS 3.2+")
29h WORD bit flags describing drive (see #02604)
2Bh WORD number of cylinders
2Dh 19 BYTEs BIOS Parameter Block for highest capacity supported
40h 3 BYTEs ???
43h 9 BYTEs filesystem type???, default = "NO NAME "
(apparently only MS-DOS 3.30 fixed media, nulls for removable
media and PC-DOS 3.30)
4Ch BYTE least-significant byte of last-accessed cylinder number
---removable media---
4Dh DWORD time of last access in clock ticks (FFFFFFFFh if never)
---fixed media---
4Dh WORD partition (FFFFh = primary, 0001h = extended)
4Fh WORD absolute cylinder number of partition's start on physical
drive (always FFFFh if primary partition)
SeeAlso: #02602,#02603
Format of COMPAQ DOS 3.31 drive data table:
Offset Size Description (Table 02602)
00h DWORD pointer to next table (offset FFFFh if last table)
04h BYTE physical unit number (for INT 13)
05h BYTE logical drive number (0=A:)
06h 25 BYTEs BIOS Parameter Block (see #02603)
1Fh 6 BYTEs reserved fields from BPB above???
25h BYTE flags
bit 6: 16-bit FAT instead of 12-bit FAT
bit 5: large volume???
26h WORD device-open count???
28h 11 BYTEs volume label or "NO NAME " if none (always "NO NAME" for
fixed media)
33h BYTE terminating null for volume label
34h BYTE device type (see #01561 at INT 21/AX=440Dh"DOS 3.2+")
35h WORD bit flags describing drive (see #02604)
37h WORD number of cylinders
39h 25 BYTEs BIOS parameter block for highest capacity drive supports
52h 6 BYTEs ??? apparently always zeros
58h BYTE least-significant byte of last-accessed cylinder number
---removable media---
59h DWORD time of last access in clock ticks (FFFFFFFFh if never)
---fixed media---
59h WORD partition (FFFFh = primary, 0001h = extended)
5Bh WORD absolute cylinder number of partition's start on physical
drive (always FFFFh if primary partition)
SeeAlso: #02601,#02603
Format of DOS 4.0-7.0 drive data table:
Offset Size Description (Table 02603)
00h DWORD pointer to next table (offset FFFFh if last table)
04h BYTE physical unit number (for INT 13)
05h BYTE logical drive number (0=A:)
06h 25 BYTEs BIOS Parameter Block (see also INT 21/AH=53h)
Offset Size Description
00h WORD bytes per sector
02h BYTE sectors per cluster, FFh if unknown
03h WORD number of reserved sectors
05h BYTE number of FATs
06h WORD number of root dir entries
08h WORD total sectors (refer to offset 15h if zero)
0Ah BYTE media descriptor, 00h if unknown
0Bh WORD sectors per FAT
0Dh WORD sectors per track
0Fh WORD number of heads
11h DWORD number of hidden sectors
15h DWORD total sectors if WORD at 08h is zero
1Fh BYTE flags
bit 6: 16-bit FAT instead of 12-bit
bit 7: unsupportable disk (all accesses will return Not Ready)
20h WORD device-open count
22h BYTE device type (see #01561 at INT 21/AX=440Dh"DOS 3.2+")
23h WORD bit flags describing drive (see #02604)
25h WORD number of cylinders (for partition only, if hard disk)
27h 25 BYTEs BIOS Parameter Block for default (highest) capacity supported
40h 6 BYTEs reserved (part of BPB above)
46h BYTE last track accessed
---removable media---
47h DWORD time of last access in clock ticks (FFFFFFFFh if never)
---fixed media---
47h WORD partition (FFFFh = primary, 0001h = extended)
always 0001h for DOS 5+
49h WORD absolute cylinder number of partition's start on physical drive
(FFFFh if primary partition in DOS 4.x)
------
4Bh 11 BYTEs volume label or "NO NAME " if none (apparently taken from
extended boot record rather than root directory)
56h BYTE terminating null for volume label
57h DWORD serial number
5Bh 8 BYTEs filesystem type ("FAT12 " or "FAT16 ")
63h BYTE terminating null for filesystem type
SeeAlso: #02601,#02602
Bitfields for flags describing drive:
Bit(s) Description (Table 02604)
0 fixed media
1 door lock ("changeline") supported
2 current BPB locked
3 all sectors in a track are the same size
4 physical drive has multiple logical units
5 current logical drive for shared physical drive
6 disk change detected
7 device parameters were changed (set DASD before formatting)
(see #01560 at INT 21/AX=440Dh"DOS 3.2+")
8 disk reformatted (BPB of current media was changed)
9 access flag (fixed media only, disables reads and writes)
(see #01566 at INT 21/AX=440Dh"DOS 3.2+")
--------f-2F1000-----------------------------
INT 2F - SHARE - INSTALLATION CHECK
AX = 1000h
Return: AL = status
00h not installed, OK to install
01h not installed, not OK to install
FFh installed
Notes: supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh
if DOS 4.01 SHARE was automatically loaded, file sharing is in an
inactive state (due to the undocumented /NC flag used by the autoload
code) until this call is made
DR DOS 5.0 SHARE 1.00 only checks for AH=10h and in this case does not
chain to a previous handler, DR DOS 6.0 SHARE 1.02+ properly chains
for any values other than AX=1000h and the private FDOS hook
AX=1001h. However, under DR PalmDOS and Novell DOS 7+, the
SHARE 2.00+ only tests for the AX=1000h install check, since it no
longer uses AX=1001h to hook into the system.
DOS 5+ chains to the previous handler if AL <> 00h on entry
Windows Enhanced mode hooks this call and reports that SHARE is
installed even when it is not
BUGS: values of AL other than 00h put DOS 3.x SHARE into an infinite loop
(08E9: OR AL,AL
08EB: JNZ 08EB) <- the buggy instruction (DOS 3.3)
values of AL other than described here put PC-DOS 4.00 into the same
loop (the buggy instructions are the same)
SeeAlso: AX=1080h,INT 21/AH=52h,INT 21/AX=4457h/DX=FFFFh
--------d-2F1001-----------------------------
INT 2F U - DR DOS 6.0+ FDOS EXTENSIONS - INSTALL FDOS HOOK (SHARE / DELWATCH)
AX = 1001h
DX:BX -> new FDOS stub entry function
Return: nothing
Notes: the default handler for the pointer set by this call under DELWATCH
simply returns with CF set
In Digital Research terminology FDOS is the part of the BDOS kernel
(IBMDOS.COM) responsible for the file system and related tasks, and
its functionality is also used by the BDOS kernel itself. However,
for reasons of performance and code size, it uses direct calling.
This interrupt allows external components like SHARE file locking or
DELWATCH delete tracking software to hook into the internal backdoor
INT 2F/AH=10h/AL<=09h chain in the kernel, so that they can actually
allows the kernel to ensure that several conditions are met when
passing control to these registered components including proper
maintaining A20, re-enterancy, or critical section mutexing
(e.g. getting the disk sub-system queue "MXdisk").
The default handler in the BDOS just sets the carry flag and returns.
Currently known clients to this shared interface are DR DOS 6.0
SHARE 1.xx, DR DOS 6.0+ DELWATCH 1.00+, which both chain onto
the same call far address, and the version of AddStor's SuperStor
which is bundled with DR DOS 6.0
However, the DR PalmDOS, and Novell DOS 7 - DR-DOS 7.03 SHARE 2.00-2.05
do not use this function to hook into the system. Instead they fix up
the share stubs directly. DR PalmDOS SHARE 2.00 uses the stubs at
Table !!! INT 21/AH=52h, while Novell DOS 7 - DR-DOS 7.03
SHARE 2.01-2.05 use the private set of share stubs at Table !!! at
INT 21/AX=4458h). Future releases may possibly again fix up the
share stubs at INT 21/AH=52h.
SeeAlso: AX=1000h,AX=F800h
--------D-2F1002CHFF-------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - READ BUFFERS
AX = 1002h
CH = FFh (pre-read required)
CL = buffer type (here FAT, DIR, or DATA, see below)
AH:DX = 24 bit sector number
Return: ES:SI -> buffer control block
Notes: This private function is called internally by the OS kernel to
ask the FDOS to find the corresponding buffer. By using the
INT 2F/AX=1001h FDOS hook, the call can be intercepted by external
system components such as the DELWATCH TSR.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1003h,AX=1008h,AX=1009h,AX=10FEh
Bitfields for Novell DOS 7 FDOS buffer type:
Bit(s) Description (Table 04099)
7 remote (on a network drive)
6 dirty (modified)
3 data sector
2 directory sector
1 FAT sector
--------D-2F1003-----------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - FLUSH BUFFERS
AX = 1003h
BL = drive???
BH = buffer type to flush (BF_ISFAT+BF_ISDIR+BF_ISDATA)
Return: nothing???
Notes: This private function is called internally by the OS kernel to
ask the FDOS to flush all buffer. By using the INT 2F/AX=1001h FDOS
hook, the call can be intercepted by external system components such
as the DELWATCH TSR.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1004h,AX=10FEh
--------D-2F1004-----------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - FREE FAT CHAIN
AX = 1004h
BX = first block to release on current drive
Return: nothing
Notes: This private function is called internally by the OS kernel to
ask the FDOS to release the FAT chain. By using the INT 2F/AX=1001h
FDOS hook, the call can be intercepted by external system components
such as the DELWATCH TSR.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1005h,AX=10FEh
--------D-2F1005-----------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - ALLOCATE CLUSTER
AX = 1005h
BX = block from which to start search (e.g. current end of file)
0000h = start of disk
Return: AX or BX??? = allocated cluster (already marked as End of Chain)
or 0000h if none available
Notes: This private function is called internally by the OS kernel to
ask the FDOS to allocate disk space. By using the
INT 2F/AX=1001h FDOS hook, the call can be intercepted by external
system components such as the DELWATCH TSR.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1004h,AX=1007h,AX=10FEh
--------D-2F1006-----------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - NEXT CLUSTER / READ FAT???
AX = 1006h
BX = current cluster number
Return: AX or BX??? = next cluster in chain
Notes: This private function is called internally by the OS kernel to
ask the FDOS to get the next cluster in a file. By using the
INT 2F/AX=1001h FDOS hook, the call can be intercepted by external
system components such as the DELWATCH TSR.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1005h,AX=1007h,AX=10FEh
--------D-2F1007-----------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - UPDATE FAT ENTRY / WRITE FAT???
AX = 1007h
BX = FAT entry to change
DX = new value
Return: nothing
Notes: This private function is called internally by the OS kernel to
ask the FDOS to update the FAT. By using the INT 2F/AX=1001h FDOS
hook, the call can be intercepted by external system components such
as the DELWATCH TSR.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1005h,AX=1006h,AX=1008h,AX=10FEh
--------D-2F1008-----------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - FIXUP CHECKSUMS / DIR UPDATE???
AX = 1008h
BX = segment of directory buffer
CX = cluster to fixup (0 = root)
DI = directory entry index (truncated to cluster if subdirectory)
BX:SI -> directory entry (single entry for hashing)
Return: nothing
Notes: This private function is called internally by the OS kernel to
ask the FDOS to fixup hashing/checksums. By using the
INT 2F/AX=1001h FDOS hook, the call can be intercepted by external
system components such as the DELWATCH TSR.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1007h,AX=1009h,AX=10FEh
--------D-2F1009-----------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - DIRECTORY BUFFER INFO
AX = 1009h
Return: ES:DI -> 128-byte directory record buffer
ES:SI -> directory BCB structure (see #04101)
Notes: This private function is called internally by the OS kernel. By using
the INT 2F/AX=1001h FDOS hook, the call can be intercepted by
external system components such as the DELWATCH TSR.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=10FEh
Format of Novell DOS 7+ FDOS directory BCB:
Offset Size Description (Table 04101)
00h BYTE drive (FFh = invalid)
01h BYTE low byte of record number
02h BYTE middle byte of record number
03h BYTE high byte of record number
--------d-2F1010CX0000-----------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - SUPERSTOR - QUERY PHYS FREE SPACE
AX = 1010h
CX = 0000h
Return: CX = free space
0000h if no physical space left on the drive
else there is still space available
Notes: This private function is internally called by the FDOS part of the
OS kernel on "out of disk space" conditions. It allows optimized
behaviour of DELWATCH delete tracking software in conjunction with
disk compression, and was implemented for SuperStor (but it would
also work with other disk compression if they hook this function).
If there truly is no physical space left on the drive, the FDOS asks
DELWATCH to purge files in its queue until enough space has been
freed, or there actually is no free disk space any more.
By using the INT 2F/AX=1001h FDOS hook, the call can be intercepted by
external system components such as SuperStor, bundled with DR DOS
"Panther" and Novell DOS 7 BETAs.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=10FEh
--------y-2F1020-----------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - CREATE PASSWORD ENTRY
AX = 1020h
???
Return: ???
Notes: This private function is called internally by the OS kernel to an
optional SECURITY TSR. By using the INT 2F/AX=1001h FDOS hook, it
can be intercepted by external system components such as
Multiuser SECURITY, bundled with DR DOS "Panther" Beta 1.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1021h,AX=1022h,AX=10FEh
--------y-2F1021-----------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - CHANGE PASSWORD ENTRY
AX = 1021h
CL > 05h ???
BX -> matching directory entry???
AL = directory attributes???
Return: ???
CF set on error (password change not allowed)
Notes: This private function is called internally by the OS kernel to an
optional SECURITY TSR. By using the INT 2F/AX=1001h FDOS hook, it
can be intercepted by external system components such as
Multiuser SECURITY, bundled with DR DOS "Panther" Beta 1.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1020h,AX=1022h,AX=10FEh
--------y-2F1022-----------------------------
INT 2F CU - Novell DOS 7+ FDOS EXTENSIONS - CHECK PASSWORD ENTRY
AX = 1022h
???
Return: ???
Notes: This private function is called internally by the OS kernel to an
optional SECURITY TSR. By using the INT 2F/AX=1001h FDOS hook, it
can be intercepted by external system components such as
Multiuser SECURITY, bundled with DR DOS "Panther" Beta 1.
This function must under no circumstances be called by applications!
SeeAlso: INT 2F/AX=1001h,AX=1020h,AX=1021h,AX=10FEh
--------f-2F1040-----------------------------
INT 2F U - DOS 4 only SHARE internal - ???
AX = 1040h
???
Return: AL = FFh???
SeeAlso: AX=1000h
--------f-2F1080-----------------------------
INT 2F U - DOS 4 only SHARE internal - TURN ON FILE SHARING CHECKS
AX = 1080h
Return: AL = status
F0h successful
FFh checking was already on
Note: DOS 4.x SHARE has dual functions: FCB support for large (>32M) media
and file sharing checks. The undocumented commandline flag /NC can
be used to disable the sharing code.
SeeAlso: AX=1000h,AX=1081h
--------f-2F1081-----------------------------
INT 2F U - DOS 4 only SHARE internal - TURN OFF FILE SHARING CHECKS
AX = 1081h
Return: AL = status
F0h successful
FFh checking was already off
Note: (see AX=1080h)
SeeAlso: AX=1000h,AX=1080h
--------O-2F10FE-----------------------------
INT 2F U - DR DOS 6.0+ DELWATCH.EXE - INSTALLATION CHECK
AX = 10FEh
Return: AL = FFh if installed and active
AH = internal version number
10h for DR DOS 6.0 DELWATCH 1.0 / 1.1 (through 1993/03/19)
20h for Novell DOS 7+ DELWATCH 2.0+
DX:BX -> private entry point (see #02605)
Notes: The DR DOS 6.0 DELWATCH 1.x used to store information about deleted
files in a hidden file named @DLWATCH.DAT, however the Novell DOS 7+
DELWATCH 2.0+ stores all the info in previously unused fields in
the files' directory entries. (See table !!! at INT 21h/11h for
details). This, however, now causes problems on systems also running
Windows 9x since Microsoft decided to use a rather similar but
incompatible method to store long filenames etc. in these entries.
Running DELWATCH 2.x on a system which previously used DELWATCH 1.x,
the @DLWATCH.DAT file will be abandoned and converted to the new
method.
SeeAlso: #01352,INT 21/AX=4306h,INT 21/AX=5704h,INT 2F/AX=1001h
(Table 02605)
Call DELWATCH private entry point with:
AH = function
00h (OS hook) installation check
AL = 00h required for DELWATCH 1.x
Return: CF clear
AX = 0000h
CX = 0004h (unsupported function)
01h (DELWATCH 1.x) New Disk
???
01h (DELWATCH 2.0+) disable DELWATCH on drive
AL = drive number (00h = A:)
Return: AX = status (0000h if failed, FFFFh if successful)
02h (OS hook) Delete File
AL = drive number (00h = A:)
DX = directory cluster number (0000h for root directory)
CX = directory entry number
DS:BX -> directory entry
ES,DS must be valid selectors if called in protected mode
Return: DS:BX -> updated directory entry
CF set if file is to be deleted by the OS
CF clear if DELWATCH has placed the file in its queue
Note: deletes the directory entry
03h (OS hook) Free Clusters
AL = drive number (00h = A:)
CX = number of clusters currently free (do not free if > 1)
DX = preferred 'search from cluster' (ignored by DELWATCH 2.0)
Return: CF clear if clusters freed
CF set if no clusters freed
DX = new 'search from' cluster (one before first free)
04h (OS hook) free root directory entry
AL = drive number (00h = A:)
Return: CF set if no directory entry freed
05h (OS hook) return free space
AL = drive number (00h = A:)
CX = number of free clusters
Return: CX = updated number of free clusters
Notes: adds space used by "deleted" files to free space
call is chained
06h enable DELWATCH on drive
AL = drive number with bit 7 set (80h = A:, etc.)
(DELWATCH 2.0+: set bit 6 for removable drives)
BX = maximum files of same name in one directory to save
CX = maximum files to save on this disk
DS:DX -> MEMDESC??? for drive data (see #04104)
DS:SI -> MEMDESC??? for DWLIST (see #04104)
ES,DS must contain valid selectors if called in protected mode
Return: AX = status
0000h failed
FFFFh successful
CX = error code on failure (see #04102)
(0004h "wrong version" if AL < 80h on entry)
07h (DELWATCH 1.x) disable DELWATCH on drive
???
07h (DELWATCH 2.0+) (OS hook) new disk
AL = drive (00h = A:, etc.)
ES:BX -> DOS DDSC structure
CF set if not enabled
Return: ???
08h set file extensions list
AL = sense (00h exclude named extensions, 01h only named ext.)
DS:BX -> 31-byte ASCIZ extension list (three blank-padded bytes
per extension)
Return: AX = FFFFh (successful)
09h adjust pending delete space
AL = drive number (00h = A:)
CX = number of clusters being freed
Return: AX = 0000h if drive not enabled
0Ah remove DELWATCH entry
AL = drive number (00h = A:)
DX = directory cluster number (0000h if root directory)
CX = directory entry number
BX:SI -> filename
ES,DS must contain valid selectors if called in protected mode
Return: AX > 0000h if entry found in DWLIST
0Bh enable NEWDISK
Return: AX > 0000h if successful (FFFFh for DELWATCH 2.0)
see also function 0Dh
0Ch (DELWATCH 1.x) drive status
AL = drive number (00h = A:, etc.)
Return: AX = drive data segment, 0000h if not enabled
CX = pending delete space, if drive enabled
0Ch (DELWATCH 2.0+) check if drive enabled
AL = drive number with bit 7 set (80h = A:, etc.)
DS:DX -> MEMDESC for drive data (see #04104)
(DX = 0000h if not required)
DS:SI -> MEMDESC for DWLIST (see #04104)
(SI = 0000h if not required)
ES,DS must contain valid selectors if called in protected mode
Return: AX = drive status (see also #04103)
0000h disabled or error
CX = error code (see #04102)
0001h drive enabled
CX = pending delete space, FFFFh if NEWDISK
not yet called
0Dh disable NEWDISK
BX = segment address of bitmap buffer
Return: AX > 0000h if successful (FFFFh for DELWATCH 2.0)
see also function 0Bh
0Eh (DELWATCH 2.0+) (OS hook) purge file
AL = drive number (00h = A:)
DX = directory cluster number (0000h if root directory)
CX = directory entry number
Return: CF set if drive not enabled
CF clear
AX = status
0000h successfully purged
else error code (see #04102)
0Fh (DELWATCH 2.0+) (OS hook) undelete file
AL = drive number (00h = A:)
DX = directory cluster number (0000h if root directory)
CX = directory entry number
Return: CF set if drive not enabled
CF clear
AX = status
0000h successfully undeleted
else error code (see #04102)
Return: AX = 0000h, CX = 0001h (see #04102) if DELWATCH busy
registers unchanged if AH > 0Fh on entry
Notes: functions marked "OS hook" must under no circumstances by called by
external applications, as this would bypass the serialization
performed by the kernel and cause problems at least in multitasking
environments.
two functions have been swapped between DELWATCH 1.x and DELWATCH 2.0
to ensure that DELWATCH 1.x calls will not do anything under newer
versions of the OS; for the same reason, the drive number in AL
sometimes requires that bit 7 be set for DELWATCH 2.0+.
SeeAlso: AX=1001h,AX=1010h
(Table 04102)
Values for DELWATCH error codes:
0001h reentered (DELWATCH busy)
0002h not enabled
0003h not found
0004h wrong version of DELWATCH
0005h memory allocation
SeeAlso: #04103
(Table 04103)
Values for DELWATCH drive status:
0000h drive not enabled
0001h OK
0002h no bitmap
0003h zero files
0004h cross-linked files
SeeAlso: #04102
Format of DELWATCH MEMDESC structure:
Offset Size Description (Table 04104)
00h BYTE memory type
01h protected mode (DPMS)
02h XMS
03h upper (high) memory
04h low memory
01h DWORD location
(conventional memory) WORD: segment base address
(XMS) WORD: XMS handle
(DPMS) DWORD: DPMS memory 32-bit base address
05h DWORD length in bytes
09h DWORD allocation
(conventional memory) WORD: memory block segment
(XMS) WORD: XMS handle (same as location handle)
(DPMS) DWORD: DPMS 32-bit handle
--------O-2F10FF-----------------------------
INT 2F U - DR DOS 5.0 - FIXUP SHARE STUB TABLE???
AX = 10FFh
ES:BX -> new SHARE stub table to use???
Return: DS destroyed???
Notes: Sets a pointer in the kernel. ES:BX points to a structure in SHARE's
segment, which presumeably contains a number (4 or 11???) of entries
of 5 bytes each and is probably part of some kind of share stub
dispatcher that gets fixed up by this call.
This was seen called by DR DOS 5.0 SHARE 1.00 (when INT 2F/AX=1000h
revealed that SHARE was not installed) before it hooked INT 2Fh
via INT 21/AH=35h to provide its install check function. It preserved
the DS register before calling.
However, the DR DOS 6.0+ SHARE 1.02+ uses INT 2F/AX=1001h to hook
into the OS, DR PalmDOS SHARE 2.00 directly fixes up the share stubs
in table !!! at INT 21h/52h, and Novell DOS 7 - DR-DOS 7.03
SHARE 2.01-2.05 maintains the private set of share stubs in
Table !!! at INT 21/AX=4458h).
This function was probably used between 1990/02/09 and 1991/03/15.
SeeAlso: INT 2F/AX=1001h
--------N-2F1100-----------------------------
INT 2F C - NETWORK REDIRECTOR - INSTALLATION CHECK
AX = 1100h
Return: AL = status
00h not installed, OK to install
01h not installed, not OK to install
FFh installed
AH = product identifier (ad hoc by various manufacturers)
00h if PC Tools v8 DRIVEMAP
42h ('B') for Beame&Whiteside BWNFS v3.0a
6Eh ('n') for NetWare Lite v1.1 CLIENT
Notes: this function is called by the DOS 3.1+ kernel
in DOS 4.x only, the 11xx calls are all in IFSFUNC.EXE, not in the
PC LAN Program redirector; DOS 5+ moves the calls back into the
redirector
the PC Network 1.00 redirector (renamed to PC LAN Program in 1.1-1.3)
only supports AL=00h-27h
--------d-2F1100SFDADA-----------------------
INT 2F - MSCDEX (MS CD-ROM Extensions) - INSTALLATION CHECK
AX = 1100h subfn DADAh
STACK: WORD DADAh
Return: AL = status
00h not installed, OK to install
STACK unchanged
01h not installed, not OK to install
STACK unchanged
FFh installed
STACK: WORD ADADh if MSCDEX installed
DADBh if Lotus CD/Networker installed
Note: although MSCDEX sets the stack word to ADADh on return, any value other
than DADAh is considered to mean that MSCDEX is already installed;
Lotus CD/Networker v4+ uses this feature to fool MSCDEX into
thinking it is already installed when it is in fact CD/Networker
that is installed
Index: installation check;Lotus CD/Networker
Index: Lotus CD/Networker;installation check
--------N-2F1101-----------------------------
INT 2F CU - NETWORK REDIRECTOR - REMOVE REMOTE DIRECTORY
AX = 1101h
SS = DOS DS
SDA first filename pointer -> fully-qualified directory name
SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1103h,AX=1105h,INT 21/AH=3Ah,INT 21/AH=60h
--------N-2F1102-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - REMOVE REMOTE DIRECTORY
AX = 1102h
SS = DOS DS
SDA first filename pointer -> fully-qualified directory name
SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
Note: appears to be identical to AX=1101h; MS internal documentation calls
this function "SEQ_RMDIR"
SeeAlso: AX=1101h
--------N-2F1103-----------------------------
INT 2F CU - NETWORK REDIRECTOR - MAKE REMOTE DIRECTORY
AX = 1103h
SS = DOS DS
SDA first filename pointer -> fully-qualified directory name
SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1101h,AX=1105h,INT 21/AH=39h,INT 21/AH=60h
--------N-2F1104-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - MAKE REMOTE DIRECTORY
AX = 1104h
SS = DOS DS
SDA first filename pointer -> fully-qualified directory name
SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
Note: appears to be identical to AX=1103h
SeeAlso: AX=1103h
--------N-2F1105-----------------------------
INT 2F CU - NETWORK REDIRECTOR - CHDIR
AX = 1105h
SS = DOS DS
SDA first filename pointer -> fully-qualified directory name
SDA CDS pointer -> current directory structure for drive with dir
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
CDS updated with new path
Notes: this function is called by the DOS 3.1+ kernel
directory string in CDS should not have a terminating backslash unless
the current directory is the root
SeeAlso: AX=1101h,AX=1103h,INT 21/AH=3Bh,INT 21/AH=60h
--------N-2F1106-----------------------------
INT 2F CU - NETWORK REDIRECTOR - CLOSE REMOTE FILE
AX = 1106h
ES:DI -> filled-in SFT (assumed to point at SDA's current SFT field)
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
SFT updated (redirector must decrement open count, which may be
done with INT 2F/AX=1208h)
ES:DI must be preserved
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1116h,AX=1201h,AX=1208h,AX=1227h,INT 21/AH=3Eh
--------N-2F1107-----------------------------
INT 2F CU - NETWORK REDIRECTOR - COMMIT REMOTE FILE
AX = 1107h
ES:DI -> filled-in SFT (assumed to point at SDA's current SFT field)
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
all buffers for file flushed
directory entry updated
ES:DI must be preserved
Desc: perform all the buffer flushing, directory updates, etc. that would be
performed on a file close, but do not decrement the SFT reference
count
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AH=68h,INT 21/AX=5D01h
--------N-2F1108-----------------------------
INT 2F CU - NETWORK REDIRECTOR - READ FROM REMOTE FILE
AX = 1108h
ES:DI -> SFT
SFT DPB field -> DPB of drive containing file
CX = number of bytes
SS = DOS DS
SDA DTA field -> user buffer
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
CX = number of bytes read (0000h = end of file)
SFT updated
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1109h,AX=1229h,INT 21/AH=3Fh"DOS",INT 21/AX=5D06h
--------N-2F1109-----------------------------
INT 2F CU - NETWORK REDIRECTOR - WRITE TO REMOTE FILE
AX = 1109h
ES:DI -> SFT
SFT DPB field -> DPB of drive containing file
CX = number of bytes
SS = DOS DS
SDA DTA field -> user buffer
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
CX = number of bytes written
SFT updated
Notes: this function is called by the DOS 3.1+ kernel
PrintCache v3.1 PCACHE.EXE intercepts this function for SFTs where
the Device Driver Header field points at PCACHE, but does not
intercept any other network redirector functions
SeeAlso: AX=1107h,AX=1108h,INT 21/AH=40h,INT 21/AX=5D06h
--------N-2F110A-----------------------------
INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - LOCK REGION OF FILE
AX = 110Ah
BX = file handle
CX:DX = starting offset
SI = high word of size
STACK: WORD low word of size
ES:DI -> SFT
SFT DPB field -> DPB of drive containing file
SS = DOS DS
Return: CF set on error
AL = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
STACK unchanged
Notes: this function is called by the DOS 3.10-3.31 kernel
the redirector is expected to resolve lock conflicts
SeeAlso: AX=110Bh,INT 21/AH=5Ch
--------N-2F110A-----------------------------
INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - LOCK/UNLOCK REGION OF FILE
AX = 110Ah
BL = function
00h lock
01h unlock
CX = number of lock/unlock parameters (0001h for DOS 4.0-6.1)
DS:DX -> parameter block (see #02606)
ES:DI -> SFT
SFT DPB field -> DPB of drive containing file
SS = DOS DS
Return: CF set on error
AL = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
Notes: this function is called by the DOS 4.0+ kernel
the redirector is expected to resolve lock conflicts
SeeAlso: AX=110Bh,INT 21/AH=5Ch
Format of parameter block entry [array, but currently limited to single entry]:
Offset Size Description (Table 02606)
00h DWORD start offset
04h DWORD size of region
--------N-2F110B-----------------------------
INT 2F CU - NETWORK REDIRECTOR (DOS 3.x only) - UNLOCK REGION OF FILE
AX = 110Bh
BX = file handle
CX:DX = starting offset
SI = high word of size
STACK: WORD low word of size
ES:DI -> SFT for file
SFT DPB field -> DPB of drive containing file
Return: CF set on error
AL = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
STACK unchanged
Note: this function is called by the DOS 3.1-3.31 kernel; DOS 4.0+ calls
AX=110Ah instead
SeeAlso: AX=110Ah,INT 21/AH=5Ch
--------N-2F110C-----------------------------
INT 2F CU - NETWORK REDIRECTOR - GET DISK INFORMATION
AX = 110Ch
ES:DI -> current directory structure for desired drive
Return: CF clear if data valid
AL = sectors per cluster
AH = media ID byte
BX = total clusters
CX = bytes per sector
DX = number of available clusters
CF set if data invalid
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AH=36h
--------N-2F110D-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - SET REMOTE FILE'S ATTRIBUTES
AX = 110Dh
SDA first filename pointer -> name of file
???
Return: ???
Note: similar to AX=110Eh
SeeAlso: AX=110Eh
--------N-2F110E-----------------------------
INT 2F CU - NETWORK REDIRECTOR - SET REMOTE FILE'S ATTRIBUTES
AX = 110Eh
SS = DOS DS
SDA first filename pointer -> fully-qualified name of file
SDA CDS pointer -> current directory structure for drive with file
STACK: WORD new file attributes
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=110Dh,AX=110Fh,INT 21/AX=4301h,INT 21/AH=60h
--------N-2F110F-----------------------------
INT 2F CU - NETWORK REDIRECTOR - GET REMOTE FILE'S ATTRIBUTES AND SIZE
AX = 110Fh
SS = DOS DS
SDA first filename pointer -> fully-qualified name of file
SDA CDS pointer -> current directory structure for drive with file
(offset = FFFFh if null CDS [net direct request])
SDA search attributes = mask of attributes which may be included in
search for file
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
AX = file attributes
BX:DI = file size
CX = time stamp of file
DX = date stamp of file
Notes: this function is called by the DOS 3.1+ kernel
wildcards and device names are not permitted
SeeAlso: AX=110Eh,INT 21/AX=4300h,INT 21/AH=60h
--------N-2F1110-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GET REMOTE FILE'S ATTRIBUTES AND SIZE
AX = 1110h
SDA first filename pointer -> name of file
???
Return: ???
Note: appears to be similar to AX=110Fh
SeeAlso: AX=110Eh
--------N-2F1111-----------------------------
INT 2F CU - NETWORK REDIRECTOR - RENAME REMOTE FILE
AX = 1111h
SS = DS = DOS DS
SDA first filename pointer = offset of fully-qualified old name
SDA second filename pointer = offset of fully-qualified new name
SDA CDS pointer -> current directory structure for drive with file
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1112h,INT 21/AH=56h,INT 21/AH=60h
--------N-2F1112-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - RENAME REMOTE FILE
AX = 1112h
SS = DS = DOS DS
SDA first filename pointer -> name of file
???
Return: ???
Note: similar to AX=1111h
SeeAlso: AX=1111h
--------N-2F1113-----------------------------
INT 2F CU - NETWORK REDIRECTOR - DELETE REMOTE FILE
AX = 1113h
SS = DS = DOS DS
SDA first filename pointer -> fully-qualified filename in DOS DS
SDA CDS pointer -> current directory structure for drive with file
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
Notes: this function is called by the DOS 3.1+ kernel
the filespec may contain wildcards
SeeAlso: AX=1114h,INT 21/AH=41h,INT 21/AH=60h
--------N-2F1114-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - DELETE REMOTE FILE
AX = 1114h
SDA first filename pointer -> name of file
???
Return: ???
Note: similar to AX=1113h
SeeAlso: AX=1113h
--------N-2F1115-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - OPEN REMOTE FILE
AX = 1115h
SS = DOS DS
ES:DI -> SFT ???
???
Return: ???
Note: similar to AX=1116h
SeeAlso: AX=1116h,AX=112Eh
--------N-2F1116-----------------------------
INT 2F CU - NETWORK REDIRECTOR - OPEN EXISTING REMOTE FILE
AX = 1116h
ES:DI -> uninitialized SFT
SS = DOS DS
SDA first filename pointer -> fully-qualified name of file to open
STACK: WORD file access and sharing modes (see #01402 at INT 21/AH=3Dh)
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
SFT filled (except handle count, which DOS manages itself)
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1106h,AX=1115h,AX=1117h,AX=1118h,AX=112Eh,INT 21/AH=3Dh
SeeAlso: INT 21/AH=60h
--------N-2F1117-----------------------------
INT 2F CU - NETWORK REDIRECTOR - CREATE/TRUNCATE REMOTE FILE
AX = 1117h
ES:DI -> uninitialized SFT
SS = DOS DS
SDA first filename pointer -> fully-qualified name of file to open
SDA CDS pointer -> current directory structure for drive with file
STACK: WORD file creation mode
low byte = file attributes (see #01401 at INT 21/AH=3Ch)
high byte = 00h normal create, 01h create new file
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
SFT filled (except handle count, which DOS manages itself)
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1106h,AX=1116h,AX=1118h,AX=112Eh,INT 21/AH=3Ch,INT 21/AH=60h
--------N-2F1118-----------------------------
INT 2F CU - NETWORK REDIRECTOR - CREATE/TRUNCATE FILE WITHOUT CDS
AX = 1118h
ES:DI -> uninitialized SFT
SS = DOS DS
SDA first filename pointer -> fully-qualified name of file
STACK: WORD file creation mode
low byte = file attributes
high byte = 00h normal create, 01h create new file
Return: ???
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel when creating a file
on a drive for which the SDA CDS pointer has offset FFFFh
SeeAlso: AX=1106h,AX=1116h,AX=1117h,AX=112Eh,INT 21/AH=60h
--------N-2F1119-----------------------------
INT 2F CU - NETWORK REDIRECTOR - FIND FIRST FILE WITHOUT CDS
AX = 1119h
SS = DS = DOS DS
[DTA] = uninitialized 21-byte findfirst search data
(see #01626 at INT 21/AH=4Eh)
SDA first filename pointer -> fully-qualified search template
SDA search attribute = attribute mask for search
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
[DTA] = updated findfirst search data
(bit 7 of first byte must be set)
[DTA+15h] = standard directory entry for file (see #01352)
Notes: this function is called by the DOS 3.1+ kernel
DOS 4.x IFSFUNC returns CF set, AX=0003h
SeeAlso: AX=111Ah,AX=111Bh,INT 21/AH=1Ah
--------N-2F111A-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - FIND NEXT FILE WITHOUT CDS
AX = 111Ah
???
Return: CF set
AX = error code (03h for DOS 4.01 IFSFUNC)
Note: use AX=111Ch for DOS 5+
SeeAlso: AX=1119h,AX=111Ch
--------N-2F111B-----------------------------
INT 2F CU - NETWORK REDIRECTOR - FINDFIRST
AX = 111Bh
SS = DS = DOS DS
[DTA] = uninitialized 21-byte findfirst search data
(see #01626 at INT 21/AH=4Eh)
SDA first filename pointer -> fully-qualified search template
SDA CDS pointer -> current directory structure for drive with file
SDA search attribute = attribute mask for search
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
[DTA] = updated findfirst search data
(bit 7 of first byte must be set)
[DTA+15h] = standard directory entry for file (see #01352)
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1119h,AX=111Ch,INT 21/AH=1Ah,INT 21/AH=4Eh,INT 21/AH=60h
--------N-2F111C-----------------------------
INT 2F CU - NETWORK REDIRECTOR - FINDNEXT
AX = 111Ch
SS = DS = DOS DS
ES:DI -> CDS
ES:DI -> DTA (MSDOS v5.0)
[DTA] = 21-byte findfirst search data
(see #01626 at INT 21/AH=4Eh)
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
[DTA] = updated findfirst search data
(bit 7 of first byte must be set)
[DTA+15h] = standard directory entry for file (see #01352)
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: AX=1119h,AX=111Bh,INT 21/AH=1Ah,INT 21/AH=4Fh
--------N-2F111D-----------------------------
INT 2F CU - NETWORK REDIRECTOR - CLOSE ALL REMOTE FILES FOR PROCESS (ABORT)
AX = 111Dh
SS = DOS DS
SDA PSP segment field = PSP of terminating process
Return: nothing
Notes: used when a process is aborted; the process being terminated is
indicated by the "sharing PSP" field in the SDA (offset 1Ah/1Ch)
this function is called by the DOS 3.1+ kernel
closes all FCBs opened by process
SeeAlso: INT 21/AX=5D04h
--------N-2F111E-----------------------------
INT 2F CU - NETWORK REDIRECTOR - DO REDIRECTION
AX = 111Eh
SS = DOS DS
STACK: WORD function to execute
5F00h get redirection mode
BL = type (03h printer, 04h disk)
Return: BH = state (00h off, 01h on)
5F01h set redirection mode
BL = type (03h printer, 04h disk)
BH = state (00h off, 01h on)
5F02h get redirection list entry
BX = redirection list index
DS:SI -> 16-byte local device name buffer
ES:DI -> 128-byte network name buffer
Return: must set user's BX to device type and CX to
stored parameter value, using AX=1218h to get
stack frame address
5F03h redirect device
BL = device type (see INT 21/AX=5F03h)
CX = stored parameter value
DS:SI -> ASCIZ source device name
ES:DI -> destination ASCIZ network path + ASCIZ passwd
5F04h cancel redirection
DS:SI -> ASCIZ device name or network path
5F05h get redirection list extended entry
BX = redirection list index
DS:SI -> buffer for ASCIZ source device name
ES:DI -> buffer for destination ASCIZ network path
Return: BH = status flag
BL = type (03h printer, 04h disk)
CX = stored parameter value
BP = NETBIOS local session number
5F06h similar to 5F05h???
Return: CF set on error
AX = error code (see #01680 at INT 21/AH=59h/BX=0000h)
STACK unchanged
Notes: this function is called by the DOS 3.1+ kernel on INT 21/AH=5Fh
(including LAN Manager calls)
the PC Network 1.00 redirector does not support function 5F06h
SeeAlso: INT 21/AX=5F00h,INT 21/AX=5F01h,INT 21/AX=5F02h,INT 21/AX=5F03h
SeeAlso: INT 21/AX=5F04h,INT 21/AX=5F05h,INT 21/AX=5F06h
--------N-2F111F-----------------------------
INT 2F CU - NETWORK REDIRECTOR - PRINTER SETUP
AX = 111Fh
STACK: WORD function
5E02h set printer setup
5E03h get printer setup
5E04h set printer mode
5E05h get printer mode
Return: CF set on error
AX = error code (see #01680 at INT 21/AH=59h/BX=0000h)
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AX=5E02h,INT 21/AX=5E03h,INT 21/AX=5E04h,INT 21/AX=5E05h
--------N-2F1120-----------------------------
INT 2F CU - NETWORK REDIRECTOR - FLUSH ALL DISK BUFFERS
AX = 1120h
DS = DOS DS
???
Return: CF clear (successful)
Notes: this function is called by the DOS 3.1+ kernel
uses CDS array pointer and LASTDRIVE= entries in DOS list of lists
SeeAlso: INT 21/AH=0Dh,INT 21/AX=5D01h
--------N-2F1121-----------------------------
INT 2F CU - NETWORK REDIRECTOR - SEEK FROM END OF REMOTE FILE
AX = 1121h
CX:DX = offset (in bytes) from end
ES:DI -> SFT
SFT DPB field -> DPB of drive with file
SS = DOS DS
Return: CF set on error
AL = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
DX:AX = new file position
Note: this function is called by the DOS 3.1+ kernel, but only when seeking
from the end of a file opened with sharing modes set in such a
manner that another process is able to change the size of the file
while it is already open
SeeAlso: AX=1228h,INT 21/AH=42h
--------N-2F1122-----------------------------
INT 2F CU - NETWORK REDIRECTOR - PROCESS TERMINATION HOOK
AX = 1122h
SS = DOS DS
DS = PSP of process about to terminate
Return: ???
Notes: this function is called by the DOS 3.1+ kernel
after calling this function, the kernel calls INT 2F/AX=111Dh
SeeAlso: AX=111Dh,INT 21/AH=4Ch,INT 60/DI=0601h
--------N-2F1123-----------------------------
INT 2F CU - NETWORK REDIRECTOR - QUALIFY REMOTE FILENAME
AX = 1123h
DS:SI -> ASCIZ filename to canonicalize
ES:DI -> 128-byte buffer for qualified name
Return: CF set if not resolved
Notes: called by MS-DOS 3.1+ kernel, but not called by DR DOS 5.0 unless the
filename matches the name of a character device
called first when DOS attempts to resolve a filename (unless inside an
AX=5D00h server call); if this fails, DOS resolves the name locally
SeeAlso: AX=1221h,INT 21/AH=60h
--------N-2F1124-----------------------------
INT 2F CU - NETWORK REDIRECTOR - TURN OFF REMOTE PRINTER
AX = 1124h
ES:DI -> SFT
SS = DOS DS
???
Return: CX = ???
Note: this function is called by the DOS 3.1+ kernel if AX=1126h
returns CF set
SeeAlso: AX=1126h
--------N-2F1125-----------------------------
INT 2F CU - NETWORK REDIRECTOR - REDIRECTED PRINTER MODE
AX = 1125h
STACK: WORD subfunction
5D07h get print stream state
Return: DL = current state
5D08h set print stream state
DL = new state
5D09h finish print job
Return: CF set on error
AX = error code (see #01680 at INT 21/AH=59h/BX=0000h)
STACK unchanged
Note: this function is called by the DOS 3.1+ kernel
SeeAlso: INT 21/AX=5D07h,INT 21/AX=5D08h,INT 21/AX=5D09h
--------N-2F1126-----------------------------
INT 2F CU - NETWORK REDIRECTOR - REMOTE PRINTER ECHO ON/OFF
AX = 1126h
ES:DI -> SFT for file handle 4???
SS = DOS DS???
???
Return: CF set on error
Notes: this function is called by the DOS 3.1+ kernel
called when print echoing (^P, ^PrtSc) changes state and STDPRN has
bit 11 of the device information word in the SFT set
SeeAlso: AX=1124h
--------N-2F1127-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
AX = 1127h
Return: CF set
AX = 0001h (invalid function) (see #01680 at INT 21/AH=59h/BX=0000h)
--------N-2F1127BX4E57-----------------------
INT 2F - NetWare 4.0 - REMOTE FILE COPY
AX = 1127h
BX = 4E57h ('NW') (signature identifying this as a NetWare call)
SI = source file handle
DI = destination file handle
DX:CX = number of bytes to copy, starting at current file position
Return: CF clear if successful
CF set on error
AX = error code (05h,06h,0Bh,11h,3Bh) (see #01680)
DX:CX = number of bytes successfully copied (file position updated)
Notes: this is the only call which may be made directly to the NetWare
redirector from an application
COMMAND.COM's COPY and DOS's XCOPY reportedly call INT 21/AX=1127h in
order to speed up copies between files on the same network server;
if error code 11h (not same device) is returned, the copy is
performed in the usual manner. However, no such calls appear to
be present in MS-DOS 6.22.
From the DR DOS "Panther" BETA COMMAND.COM (1992/06/22) up to some of
the Novell DOS 7 COMMAND.COM updates (1994/09/12), the shell made
calls to INT 2F/AX=11F0h to attempt "remote server COPYing". However,
this was removed from later releases of the shell because it stopped
Performance Technologies' PowerLAN 3.1 working. (A successor of
the DR-DOS 7.03 COMMAND.COM may possibly reintroduce this remote
copy feature. Probably it would then try both INT 2F/AX=1127h and
INT 2F/AX=11F0h.)
SeeAlso: INT 2F/AX=11F0h
--------N-2F1128-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
AX = 1128h
Return: CF set
AX = 0001h (invalid function) (see #01680 at INT 21/AH=59h/BX=0000h)
--------N-2F1129-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - UNUSED
AX = 1129h
Return: CF set
AX = 0001h (invalid function) (see #01680 at INT 21/AH=59h/BX=0000h)
--------N-2F112A-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - CLOSE ALL FILES FOR PROCESS
AX = 112Ah
DS = DOS DS
???
Return: ???
Note: does something to each IFS driver
--------N-2F112B-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GENERIC IOCTL
AX = 112Bh
SS = DOS DS
CX = function/category
DS:DX -> parameter block
STACK: WORD value of AX on entry to INT 21 (440Ch or 440Dh)
???
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
Note: this function is called by the DOS 4.0 kernel
--------N-2F112C-----------------------------
INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - "UPDATE_CB" - ???
AX = 112Ch
SS = DOS DS
SDA current SFT pointer -> SFT for file
???
Return: CF set on error
Note: called by SHARE in DOS 5.0-6.0
--------N-2F112D-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - EXTENDED ATTRIBUTES
AX = 112Dh
BL = subfunction (value of AL on INT 21)
02h get extended attributes
03h get extended attribute properties
04h set extended attributes
Return: CF clear
else ???
Return: CX = ??? (00h or 02h for DOS 4.01)
ES:DI -> SFT for file
SS = DOS DS
Return: DS = DOS DS
Note: this function is called by the DOS 4.0 kernel on INT 21/AX=5702h,
INT 21/AX=5703h, and INT 21/AX=5704h
SeeAlso: INT 21/AX=5702h,INT 21/AX=5703h,INT 21/AX=5704h,INT 21/AH=6Eh
--------N-2F112E-----------------------------
INT 2F CU - NETWORK REDIRECTOR (DOS 4.0+) - EXTENDED OPEN/CREATE FILE
AX = 112Eh
SS = DS = DOS DS
ES:DI -> uninitialized SFT for file
STACK: WORD file attribute for created/truncated file
low byte = file attributes
high byte = 00h normal create/open, 01h create new file
SDA first filename pointer -> fully-qualified filename
SDA extended file open action = action code
(see #01770 at INT 21/AX=6C00h)
SDA extended file open mode = open mode for file (see INT 21/AX=6C00h)
Return: CF set on error
AX = error code
CF clear if successful
CX = result code
01h file opened
02h file created
03h file replaced (truncated)
SFT initialized (except handle count, which DOS manages itself)
Note: this function is called by the DOS 4.0+ kernel
BUG: this function is not called correctly under some DOS versions
(at least 5.0 and 6.2):
the file attribute on the stack is not correct if the action
code is 11h,
the result code in CX is not passed back to the application.
SeeAlso: AX=1115h,AX=1116h,AX=1117h,INT 21/AX=6C00h
--------N-2F112F-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - IFS IOCTL
AX = 112Fh
SS = DOS DS
STACK: WORD function in low byte
00h ???
DS:SI -> Current Directory Structure???
CL = drive (1=A:)
01h ???
DS:SI -> ???
CL = file handle???
02h ???
DS:SI -> Current Directory Structure???
DI = ???
CX = drive (1=A:)
???
Return: CF set on error
AX = DOS error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
Note: this function is called by the DOS 4.0 kernel
SeeAlso: INT 21/AH=6Bh
--------N-2F1130-----------------------------
INT 2F CU - IFSFUNC.EXE (DOS 4.x only) - GET IFSFUNC SEGMENT
AX = 1130h
Return: ES = CS of resident IFSFUNC
--------N-2F1180-----------------------------
INT 2F - LAN Manager Enhanced DOS Services - ???
AX = 1180h
???
Return: ???
SeeAlso: AX=1100h,AX=1181h,AX=118Eh
--------N-2F1181-----------------------------
INT 2F - LAN Manager Enhanced DOS Services - SET USER NAME???
AX = 1181h
???
Return: ???
SeeAlso: AX=1100h,AX=1180h
--------N-2F1182-----------------------------
INT 2F - LAN Manager Enhanced DOS Services - INSTALL SERVICE
AX = 1182h
???
Return: ???
SeeAlso: AX=1100h,AX=1180h
--------N-2F1184-----------------------------
INT 2F - LAN Manager Enhanced DOS - ???
AX = 1184h
???
Return: ???
--------N-2F1186-----------------------------
INT 2F - LAN Manager Enhanced DOS - DosReadAsynchNmPipe
AX = 1186h
DS:SI -> stack frame (see #02607)
Return: CF clear if successful
CF set if error
AX = error code
Note: LAN Manager enhance mode adds features beyond the standard redirector
file/printer services
SeeAlso: AX=118Fh,AX=1190h,AX=1191h,INT 21/AX=5F39h
Format of LAN Manager DosReadAsynchNmPipe stack frame:
Offset Size Description (Table 02607)
00h DWORD -> number of bytes read
04h WORD size of buffer
06h DWORD -> buffer
0Ah DWORD -> return code
0Eh DWORD function to call on completion as function( char far *buffer )
12h WORD handle
--------N-2F118A-----------------------------
INT 2F - LAN Manager 2.0+ DOS Enhanced ENCRYPT.EXE - STREAM ENCRYPTION SERVICE
AX = 118Ah
BX = function (0000h or 0001h)
Return: CF clear if successful
AX = 1100h success
CF set if error
AX = 0001h, etc.
SeeAlso: AX=1186h,AH=41h,AH=42h,AH=4Bh
--------N-2F118B-----------------------------
INT 2F - LAN Manager Enhanced DOS - ???
AX = 118Bh
???
Return: ???
--------N-2F118C-----------------------------
INT 2F - LAN Manager Enhanced DOS - ???
AX = 118Ch
???
Return: ???
--------N-2F118E-----------------------------
INT 2F - LAN Manager Enhanced DOS - ???
AX = 118Eh
???
Return: ???
--------N-2F118F-----------------------------
INT 2F - LAN Manager Enhanced DOS - DosWriteAsynchNmPipe
AX = 118Fh
DS:SI -> stack frame (see #02608)
Return: CF clear if successful
CF set if error
AX = error code
SeeAlso: AX=1186h,AX=1191h,INT 21/AX=5F3Ah
Format of LAN Manager DosReadAsynchNmPipe stack frame:
Offset Size Description (Table 02608)
00h DWORD -> number of bytes read
04h WORD Size of buffer
06h DWORD -> buffer
0Ah DWORD -> return code
0Eh DWORD function to call on completion as function( char far *buffer )
12h WORD handle
--------N-2F1190-----------------------------
INT 2F - LAN Manager Enhanced DOS - DosReadAsynchNmPipe2
AX = 1190h
DS:SI -> stack frame (see #02609)
Return: CF clear if successful
CF set if error
AX = error code
SeeAlso: AX=1186h,AX=1191h
Format of LAN Manager DosReadAsynchNmPipe2 stack frame:
Offset Size Description (Table 02609)
00h DWORD -> number of bytes read
04h WORD size of buffer
06h DWORD -> buffer
0Ah DWORD -> return code
0Eh DWORD function to call on completion as function( char far *buffer )
12h WORD handle
14h DWORD ???
--------N-2F1191-----------------------------
INT 2F - LAN Manager Enhanced DOS - DosWriteAsynchNmPipe2
AX = 1191h
DS:SI -> stack frame (see #02610)
Return: CF clear if successful
CF set if error
AX = error code
SeeAlso: AX=118Fh,AX=1190h,INT 21/AX=5F3Ah
Format of LAN Manager DosReadAsynchNmPipe2 stack frame:
Offset Size Description (Table 02610)
00h DWORD -> number of bytes read
04h WORD size of buffer
06h DWORD -> buffer
0Ah DWORD -> return code
0Eh DWORD function to call on completion as function( char far *buffer )
12h WORD handle
14h DWORD ???
--------N-2F11F0-----------------------------
INT 2F - Novell ??? - REMOTE FILE COPY
AX = 11F0h
SI = source file handle
DI = destination file handle
DX:CX = number of bytes to copy, starting at current file position
CF cleared
Return: CF clear:
AX = 11F0h "no network there"
AX <> 11F0h if successful
CF set on error "the request could not be handled"
AX = error code (05h,06h,0Bh,11h,3Bh) (see #01680)
DX:CX = number of bytes successfully copied (file position updated)
Notes: From the DR DOS "Panther" BETA COMMAND.COM (1992/06/22) up to some of
the Novell DOS 7 COMMAND.COM updates (1994/09/12), the shell made
calls to INT 2F/AX=11F0h to attempt "remote server COPYing". However,
this was removed from later releases of the shell because it
interfered with Performance Technologies' PowerLAN 3.1. (A successor
of the DR-DOS 7.03 COMMAND.COM may possibly reintroduce this remote
copy feature. Probably it would then try both INT 2F/AX=1127h and
INT 2F/AX=11F0h.)
SeeAlso: INT 2F/AX=1127h
--------D-2F1200-----------------------------
INT 2F U - DOS 3.0+ internal - INSTALLATION CHECK
AX = 1200h
Return: AL = FFh (for compatibility with other INT 2F functions)
--------D-2F1201-----------------------------
INT 2F U - DOS 3.0+ internal - CLOSE CURRENT FILE
AX = 1201h
SS = DOS DS = DOS kernel data seg (must be using a DOS internal stack)
SDA current SFT pointer -> SFT of file to close
Return: CF set on error
ES:DI -> SFT for file
CX undefined (new reference count of SFT in many versions)
BX destroyed
SeeAlso: AX=1106h,AX=1227h,INT 21/AH=3Eh
--------D-2F1202-----------------------------
INT 2F U - DOS 3.0+ internal - GET INTERRUPT ADDRESS
AX = 1202h
STACK: WORD vector number
Return: ES:BX -> interrupt vector (DWORD containing handler's address)
STACK unchanged
--------D-2F1203-----------------------------
INT 2F U - DOS 3.0+ internal - GET DOS DATA SEGMENT
AX = 1203h
Return: DS = data segment of IBMDOS.COM/MSDOS.SYS
Note: for DOS prior to version 5.0, the data segment is the same as the code
segment
--------D-2F1204-----------------------------
INT 2F U - DOS 3.0+ internal - NORMALIZE PATH SEPARATOR
AX = 1204h
STACK: WORD character to normalize
Return: AL = normalized character (forward slash turned to backslash, all
others unchanged)
ZF set if path separator
STACK unchanged
--------D-2F1205-----------------------------
INT 2F U - DOS 3.0+ internal - OUTPUT CHARACTER TO STANDARD OUTPUT
AX = 1205h
STACK: WORD character to output
Return: STACK unchanged
Note: can be called only from within DOS
--------D-2F1206-----------------------------
INT 2F U - DOS 3.0+ internal - INVOKE CRITICAL ERROR
AX = 1206h
DI = error code
BP:SI -> device driver header (see #01646)
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD value to be passed to INT 24 in AX
Return: AL = 0-3 for Abort, Retry, Ignore, Fail
STACK unchanged
SeeAlso: INT 24
--------D-2F1207-----------------------------
INT 2F U - DOS 3.0+ internal - MAKE DISK BUFFER MOST-RECENTLY USED
AX = 1207h
DS:DI -> disk buffer
Return: nothing
Desc: move the indicated buffer to the end of the disk buffer chain (least-
recently used is first); under DOS 3.3, the buffer is then moved to
the start of the disk buffer chain if it was marked unused
Notes: can be called only from within DOS
this function is nearly the same as AX=120Fh
SeeAlso: AX=120Fh
--------D-2F1208-----------------------------
INT 2F U - DOS 3.0+ internal - DECREMENT SFT REFERENCE COUNT
AX = 1208h
ES:DI -> SFT
Return: AX = original value of reference count
Notes: if the reference count was 1, it is set to FFFFh ("busy", since 0
indicates that the SFT is not in use). It is the caller's
responsibility to set the reference count to zero after cleaning up.
used by network redirectors such as MSCDEX
SeeAlso: AX=1106h
--------D-2F1209-----------------------------
INT 2F U - DOS 3.0+ internal - FLUSH AND FREE DISK BUFFER
AX = 1209h
DS:DI -> disk buffer
Return: disk buffer marked unused, contents written to disk if buffer dirty
Note: can be called only from within DOS
SeeAlso: AX=120Eh,AX=1215h
--------D-2F120A-----------------------------
INT 2F U - DOS 3.0+ internal - PERFORM CRITICAL ERROR INTERRUPT
AX = 120Ah
DS = SS = DOS DS (must be using a DOS internal stack)
STACK: WORD extended error code
Return: AL = user response (0=ignore, 1=retry, 2=abort, 3=fail)
CF clear if retry, set otherwise
STACK unchanged
Notes: can only be called during a DOS function call, as it uses various
fields in the SDA to set up the registers for the INT 24
reportedly sets current DPB's first root directory sector to 1
SeeAlso: INT 24
--------D-2F120B-----------------------------
INT 2F U - DOS 3.0+ internal - SIGNAL SHARING VIOLATION TO USER
AX = 120Bh
ES:DI -> system file table entry for previous open of file
STACK: WORD extended error code (should be 20h--sharing violation)
Return: CF clear if operation should be retried
CF set if operation should not be retried
AX = error code (20h) (see #01680 at INT 21/AH=59h/BX=0000h)
STACK unchanged
Notes: can only be called during a DOS function call
should only be called if an attempt was made to open an already-open
file contrary to the sharing rules
invokes INT 24 if SFT file opened via FCB or in compatibility mode with
inheritance allowed
--------D-2F120C-----------------------------
INT 2F U - DOS 3.0+ internal - OPEN DEVICE AND SET SFT OWNER/MODE
AX = 120Ch
SDA current SFT pointer -> SFT for file
DS = DOS DS
SS = DOS DS (must be using a DOS internal stack)
Return: ES, DI, AX destroyed
Notes: invokes "device open" call on device driver for SFT
changes owner of last-accessed SFT to calling process if it was opened
via FCB
called by network redirectors such as MSCDEX
--------D-2F120D-----------------------------
INT 2F U - DOS 3.0+ internal - GET DATE AND TIME
AX = 120Dh
SS = DOS DS (must be using a DOS internal stack)
Return: AX = current date in packed format (see #01666 at INT 21/AX=5700h)
DX = current time in packed format (see #01665 at INT 21/AX=5700h)
SeeAlso: INT 21/AH=2Ah,INT 21/AH=2Ch
--------D-2F120E-----------------------------
INT 2F U - DOS 3.0+ internal - MARK ALL DISK BUFFERS UNREFERENCED
AX = 120Eh
SS = DOS DS (must be using a DOS internal stack)
Return: DS:DI -> first disk buffer
Notes: clears "referenced" flag on all disk buffers
in DOS 5+, this has become essentially a NOP, invoking the same code
used by AX=1224h (SHARING DELAY)
SeeAlso: AX=1209h,AX=1210h,INT 21/AH=0Dh
--------D-2F120F-----------------------------
INT 2F U - DOS 3.0+ internal - MAKE BUFFER MOST RECENTLY USED
AX = 120Fh
DS:DI -> disk buffer
SS = DOS DS (must be using a DOS internal stack)
Return: DS:DI -> next buffer in buffer list
Desc: move the indicated buffer to the end of the disk buffer chain (least-
recently used is first); under DOS 3.3, the buffer is then moved to
the start of the disk buffer chain if it was marked unused
Note: this function is the same as AX=1207h except that it returns a
pointer to the buffer following the specified buffer in the buffer
chain
SeeAlso: AX=1207h
--------D-2F1210-----------------------------
INT 2F U - DOS 3.0+ internal - FIND UNREFERENCED DISK BUFFER
AX = 1210h
DS:DI -> first disk buffer to check
Return: ZF clear if found
DS:DI -> first unreferenced disk buffer
ZF set if not found
Note: in DOS 5+, this has become essentially a NOP, invoking the same code
used by AX=1224h (SHARING DELAY)
SeeAlso: AX=120Eh
--------D-2F1211-----------------------------
INT 2F U - DOS 3.0+ internal - NORMALIZE ASCIZ FILENAME
AX = 1211h
DS:SI -> ASCIZ filename to normalize
ES:DI -> buffer for normalized filename
Return: destination buffer filled with uppercase filename, with slashes turned
to backslashes
SeeAlso: AX=121Eh,AX=1221h
--------D-2F1212-----------------------------
INT 2F U - DOS 3.0+ internal - GET LENGTH OF ASCIZ STRING
AX = 1212h
ES:DI -> ASCIZ string
Return: CX = length of string
SeeAlso: AX=1225h
--------D-2F1213-----------------------------
INT 2F U - DOS 3.0+ internal - UPPERCASE CHARACTER
AX = 1213h
STACK: WORD character to convert to uppercase
Return: AL = uppercase character
STACK unchanged
--------D-2F1214-----------------------------
INT 2F U - DOS 3.0+ internal - COMPARE FAR POINTERS
AX = 1214h
DS:SI = first pointer
ES:DI = second pointer
Return: ZF set if pointers are equal, ZF clear if not equal
CF clear if pointers equal, CF set if not
--------D-2F1215-----------------------------
INT 2F U - DOS 3.0+ internal - FLUSH BUFFER
AX = 1215h
DS:DI -> disk buffer
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD drives for which to skip buffer
ignore buffer if drive same as high byte, or bytes differ and
the buffer is for a drive OTHER than that given in low byte
Return: STACK unchanged
Note: can be called only from within DOS
SeeAlso: AX=1209h
--------D-2F1216-----------------------------
INT 2F U - DOS 3.0+ internal - GET ADDRESS OF SYSTEM FILE TABLE ENTRY
AX = 1216h
BX = system file table entry number
Return: CF clear if successful
ES:DI -> system file table entry
BX = relative entry number in system file table containing entry
AX destroyed
CF set if BX greater than FILES=
Note: supported by DR DOS 5+
SeeAlso: AX=1220h
--------D-2F1217-----------------------------
INT 2F U - DOS 3.0+ internal - GET CURRENT DIRECTORY STRUCTURE FOR DRIVE
AX = 1217h
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD drive (0 = A:, 1 = B:, etc)
Return: CF set on error
(drive > LASTDRIVE)
CF clear if successful
DS:SI -> current directory structure for specified drive
STACK unchanged
SeeAlso: AX=1219h
--------D-2F1218-----------------------------
INT 2F U - DOS 3.0+ internal - GET CALLER'S REGISTERS
AX = 1218h
Return: DS:SI -> saved caller's AX,BX,CX,DX,SI,DI,BP,DS,ES (on stack)
Note: only valid while within DOS
--------D-2F1219-----------------------------
INT 2F U - DOS 3.0+ internal - SET DRIVE???
AX = 1219h
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD drive (0 = default, 1 = A:, etc)
Return: ???
STACK unchanged
Notes: calls AX=1217h
builds a current directory structure if inside server call
(INT 21/AX=5D00h)
SeeAlso: AX=1217h,AX=121Fh
--------D-2F121A-----------------------------
INT 2F U - DOS 3.0+ internal - GET FILE'S DRIVE
AX = 121Ah
DS:SI -> filename
Return: AL = drive (0 = default, 1 = A:, etc, FFh = invalid)
DS:SI -> filename without leading X: (if present)
SeeAlso: INT 21/AH=19h,INT 21/AH=60h
--------D-2F121B-----------------------------
INT 2F U - DOS 3.0+ internal - SET YEAR/LENGTH OF FEBRUARY
AX = 121Bh
CL = year - 1980
Return: AL = number of days in February
Note: requires DS to be set to the DOS data segment
SeeAlso: INT 21/AH=2Bh"DATE"
--------D-2F121C-----------------------------
INT 2F U - DOS 3.0+ internal - CHECKSUM MEMORY
AX = 121Ch
DS:SI -> start of memory to checksum
CX = number of bytes
DX = initial checksum
SS = DOS DS (must be using a DOS internal stack)
Return: AX, CX destroyed
DX = checksum
DS:SI -> first byte after checksummed range
Notes: used by DOS to determine day count since 1980/1/1 given a date
supported by DR DOS 5.0+
SeeAlso: AX=121Dh
--------D-2F121D-----------------------------
INT 2F U - DOS 3.0+ internal - SUM MEMORY
AX = 121Dh
DS:SI -> memory to add up
CX = 0000h
DX = limit
Return: AL = byte which exceeded limit
CX = number of bytes before limit exceeded
DX = remainder after adding first CX bytes
DS:SI -> byte beyond the one which exceeded the limit
Notes: used by DOS to determine year or month given day count since 1980/1/1
supported by DR DOS 5.0+
SeeAlso: AX=121Ch
--------D-2F121E-----------------------------
INT 2F U - DOS 3.0+ internal - COMPARE FILENAMES
AX = 121Eh
DS:SI -> first ASCIZ filename
ES:DI -> second ASCIZ filename
Return: ZF set if filenames equivalent, ZF clear if not
Note: supported by DR DOS 5.0+
SeeAlso: AX=1211h,AX=1221h
--------D-2F121F-----------------------------
INT 2F U - DOS 3.0+ internal - BUILD CURRENT DIRECTORY STRUCTURE
AX = 121Fh
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD drive letter
Return: ES:DI -> current directory structure (will be overwritten by next call)
STACK unchanged
--------D-2F1220-----------------------------
INT 2F U - DOS 3.0+ internal - GET JOB FILE TABLE ENTRY
AX = 1220h
BX = file handle
Return: CF set on error
AL = 6 (invalid file handle)
CF clear if successful
ES:DI -> JFT entry for file handle in current process
Notes: the byte pointed at by ES:DI contains the number of the SFT for the
file handle, or FFh if the handle is not open
supported by DR DOS 5.0+
SeeAlso: AX=1216h,AX=1229h
--------D-2F1221-----------------------------
INT 2F U - DOS 3.0+ internal - CANONICALIZE FILE NAME
AX = 1221h
DS:SI -> file name to be fully qualified
ES:DI -> 128-byte buffer for resulting canonical file name
SS = DOS DS (must be using a DOS internal stack)
Return: (see INT 21/AH=60h)
Note: identical to INT 21/AH=60h
SeeAlso: AX=1123h,INT 21/AH=60h
--------D-2F1222-----------------------------
INT 2F U - DOS 3.0+ internal - SET EXTENDED ERROR INFO
AX = 1222h
SS = DOS data segment
SS:SI -> 4-byte records
BYTE error code, FFh = last record
BYTE error class, FFh = don't change
BYTE suggested action, FFh = don't change
BYTE error locus, FFh = don't change
SDA error code set
Return: SI destroyed
SDA error class, error locus, and suggested action fields set
Note: can be called only from within DOS
SeeAlso: AX=122Dh,INT 21/AH=59h/BX=0000h,INT 21/AX=5D0Ah
--------D-2F1223-----------------------------
INT 2F U - DOS 3.0+ internal - CHECK IF CHARACTER DEVICE
AX = 1223h
DS = DOS DS
SS = DOS DS (must be using a DOS internal stack)
SDA+218h (DOS 3.10-3.30) = eight-character blank-padded name
SDA+22Bh (DOS 4.0-6.0) = eight-character blank-padded name
SDA file attribute field set
direction flag clear (i.e. CLD)
Return: CF set if no character device by that name found
CF clear if found
BH bits 4-0 copied from low byte of device attribute word
BH bit 5 set, bits 7-6 clear
Notes: can only be called from within DOS
the check is skipped (always says "not device") if the volume ID bit
of the file attribute field is set on entry
SeeAlso: INT 21/AX=5D06h,INT 21/AX=5D0Bh
--------D-2F1224-----------------------------
INT 2F U - DOS 3.0+ internal - SHARING RETRY DELAY
AX = 1224h
SS = DOS DS (must be using a DOS internal stack)
Return: after delay set by INT 21/AX=440Bh, unless in server call
(INT 21/AX=5D00h)
Note: delay is dependent on the processor speed, and is skipped entirely if
inside a server call
SeeAlso: INT 21/AX=440Bh,INT 21/AH=52h,INT 62/AX=0097h
--------D-2F1225-----------------------------
INT 2F U - DOS 3.0+ internal - GET LENGTH OF ASCIZ STRING
AX = 1225h
DS:SI -> ASCIZ string
Return: CX = length of string
Note: supported by DR DOS 5.0+
SeeAlso: AX=1212h
--------D-2F1226-----------------------------
INT 2F U - DOS 3.3+ internal - OPEN FILE
AX = 1226h
CL = access mode
DS:DX -> ASCIZ filename
SS = DOS DS (must be using a DOS internal stack)
Return: CF set on error
AL = error code (see #01680 at INT 21/AH=59h/BX=0000h)
CF clear if successful
AX = file handle
Notes: can only be called from within DOS
equivalent to INT 21/AH=3Dh
used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: AX=1227h,INT 21/AH=3Dh
--------D-2F1227-----------------------------
INT 2F U - DOS 3.3+ internal - CLOSE FILE
AX = 1227h
BX = file handle
SS = DOS DS (must be using a DOS internal stack)
Return: CF set on error
AL = 06h invalid file handle
CF clear if successful
Notes: can only be called from within DOS
equivalent to INT 21/AH=3Eh
used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: AX=1106h,AX=1201h,AX=1226h,INT 21/AH=3Eh
--------D-2F1228BP4200-----------------------
INT 2F U - DOS 3.3+ internal - MOVE FILE POINTER
AX = 1228h
BP = 4200h, 4201h, 4202h (see INT 21/AH=42h)
BX = file handle
CX:DX = offset in bytes
SS = DOS DS (must be using a DOS internal stack)
Return: as for INT 21/AH=42h
Notes: equivalent to INT 21/AH=42h, but may only be called from inside a DOS
function call
sets user stack frame pointer to dummy buffer, moves BP to AX, performs
LSEEK, and restores frame pointer
used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: INT 21/AH=42h
--------D-2F1229-----------------------------
INT 2F U - DOS 3.3+ internal - READ FROM FILE
AX = 1229h
BX = file handle
CX = number of bytes to read
DS:DX -> buffer
SS = DOS DS (must be using a DOS internal stack)
Return: as for INT 21/AH=3Fh"DOS"
Notes: equivalent to INT 21/AH=3Fh, but may only be called when already inside
a DOS function call
used by NLSFUNC to access COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: AX=1226h,INT 21/AH=3Fh"DOS"
--------D-2F122A-----------------------------
INT 2F U - DOS 3.3+ internal - SET FASTOPEN ENTRY POINT
AX = 122Ah
BX = entry point to set (0001h or 0002h)
DS:SI -> FASTOPEN entry point (see #02611,#02612)
(entry point not set if SI = FFFFh for DOS 4.0+)
Return: CF set if specified entry point already set
Notes: entry point in BX is ignored under DOS 3.30
both entry points set to same handler by DOS 4.01
DOS 5.0 and 6.0 only set entry point 1
(Table 02611)
Values DOS 3.30+ FASTOPEN entry point is called with:
AL = 01h Lookup
CX = ??? seems to be offset
DI = ??? seems to be offset
SI = offset in DOS DS of filename
AL = 02h insert file into FASTOPEN cache
AL = 03h delete file from FASTOPEN cache
SI = offset in DOS DS of filename
AL = 04h purge FASTOPEN cache
AH = subfunction (00h,01h,02h)
ES:DI -> ???
CX = ??? (subfunctions 01h and 02h only)
Returns: CF set on error or not installed
Note: function 03h calls function 01h first
SeeAlso: #02612,#02613
(Table 02612)
Values PC-DOS 4.01 FASTOPEN is additionally called with:
AL = 04h ???
AH = 03h
???
AL = 05h ???
AL = 0Bh ???
AL = 0Ch ???
AL = 0Dh ???
AL = 0Eh ???
AL = 0Fh ???
AL = 10h ???
SeeAlso: #02611,#02613
(Table 02613)
Values MS-DOS 5.0-6.0 FASTOPEN is additionally called with:
AL = 04h purge FASTOPEN cache
AH = 03h
???
AL = 05h ???
DL = drive (00h = A:)
???
AL = 06h ???
???
SeeAlso: #02611,#02612
--------D-2F122B-----------------------------
INT 2F U - DOS 3.3+ internal - IOCTL
AX = 122Bh
BP = 44xxh
SS = DOS DS (must be using a DOS internal stack)
additional registers as appropriate for INT 21/AX=44xxh
Return: as for INT 21/AH=44h
Notes: equivalent to INT 21/AH=44h, but may only be called when already inside
a DOS function call
sets user stack frame pointer to dummy buffer, moves BP to AX, performs
IOCTL, and restores frame pointer
used by NLSFUNC in accessing COUNTRY.SYS when invoked by the DOS kernel
SeeAlso: INT 21/AH=44h
--------D-2F122C-----------------------------
INT 2F U - DOS 3.3+ internal - GET DEVICE CHAIN
AX = 122Ch
Return: BX:AX -> header of second device driver (NUL is first) in driver chain
Note: although this function exists in DR DOS 5.0 and Novell DOS 7, it
always returns 0000h:0000h prior to Novell DOS 7 Update 15
SeeAlso: INT 21/AH=52h
--------D-2F122D-----------------------------
INT 2F U - DOS 3.3+ internal - GET EXTENDED ERROR CODE
AX = 122Dh
SS = DOS DS
Return: AX = current extended error code
SeeAlso: AX=1222h,INT 21/AH=59h/BX=0000h
--------D-2F122E-----------------------------
INT 2F U - DOS 4.0+ internal - GET OR SET ERROR TABLE ADDRESSES
AX = 122Eh
DL = subfunction
00h get standard DOS error table (see #02614)
Return: ES:DI -> error table
(DOS 4: errors 00h-12h,50h-5Bh)
(DOS 5: errors 00h-26h,4Fh,51h-59h)
01h set standard DOS error table
ES:DI -> error table
02h get parameter error table (errors 00h-0Ah)
Return: ES:DI -> error table
03h set parameter error table
ES:DI -> error table
04h get critical/SHARE error table (errors 13h-2Bh)
Return: ES:DI -> error table
05h set critical/SHARE error table
ES:DI -> error table
06h get ??? error table
Return: ES:DI -> error table or 0000h:0000h
07h set ??? error table
ES:DI -> error table
08h get error message retriever (see #02615)
Return: ES:DI -> FAR procedure to fetch error message
09h set ??? error table
ES:DI -> error table
Notes: if the returned segment on a "get" is 0001h, then the offset specifies
the offset of the error message table within COMMAND.COM, and the
procedure returned by DL=08h should be called
DOS 5+ COMMAND.COM does not allow setting any of the addresses (calls
with DL odd are ignored); they are always returned with segment 0001h
for DOS 5.0, the standard and critical/SHARE error tables are combined
into a single error table
SeeAlso: AX=0500h,INT 21/AH=59h/BX=0000h
Format of DOS 4.x error table:
Offset Size Description (Table 02614)
00h BYTE FFh
01h 2 BYTEs 04h,00h (DOS version???)
03h BYTE number of error headers following
04h 2N WORDs table of all error headers for table
Offset Size Description
00h WORD error message number
02h WORD offset of error message from start of header
error messages are count byte followed by msg
Note: DOS 5 error tables consist of one word per error number; each word
contains either the offset of a counted string or 0000h
(Table 02615)
Call error retrieval function with:
AX = error number (see #02616)
DI = offset of error table
Return: ES:DI -> error message (counted string)
Notes: this function needs to access COMMAND.COM if the messages were not
loaded into memory permanently with /MSG; the caller should assume
that the returned message will be overwritten by the next call of
the function
supported by DR DOS 5.0
(Table 02616)
Values for parameter errors:
01h Too many parameters
02h Required Parameter missing
03h Invalid switch
04h Invalid keyword
06h Parameter value not in allowed range
07h Parameter value not allowed
08h Parameter value not allowed
09h Parameter format not correct
0Ah Invalid parameter
0Bh Invalid parameter combination
--------D-2F122F-----------------------------
INT 2F U - DOS 4.x internal - SET DOS VERSION NUMBER TO RETURN
AX = 122Fh
DX = DOS version number (0000h = return true DOS version)
Notes: not available under DR DOS 5.0 or 6.0, or Novell DOS 7
supported by FREEVER.COM, a freeware DOS version faking TSR by Matthias
Paul
SeeAlso: INT 21/AH=30h,INT 21/AX=3306h,INT 2F/AX=E000h"SETDRVER"
----------2F1230-----------------------------
INT 2F U - Windows95 - FIND SFT ENTRY IN INTERNAL FILE TABLES
AX = 1230h
ES:DI -> SFT entry
Return: CF clear if SFT found in internal table
CF set if SFT not in any internal file table
AX = 0000h
SI:CX = 32-bit starting cluster number for directory
DX = directory entry number
BX = index into new file system table
Notes: the new file system table from which the return values are taken is
reported to be statically allocated with 20 entries, and used only
for FCB calls
this function is not supported by DR-DOS 7.03 or earlier, by S/DOS 1.0,
or by PTS-DOS 6.51
BUG: Win95-OSR2 is reported to have a bug that can potentially corrupt
memory if SFT tables are "arranged poorly"
SeeAlso: AX=1231h,AX=1200h
----------2F1231-----------------------------
INT 2F U - Windows95 - SET/CLEAR "REPORT WINDOWS TO DOS PROGRAMS" FLAG
AX = 1231h
DL = function
00h set byte after "IsWIN386" to 01h
01h set "IsWIN386" bit 1
02h clear "IsWIN386" bit 1
else
Return: CF set
AX = 0001h
Return: CF clear
AX = 0000h
Note: this function is not supported by DR-DOS 7.03 or earlier, by S/DOS 1.0,
or by PTS-DOS 6.51
BUG: Windows98 will crash the system if DL>02h on entry due to an off-by-1
conditional jump; if the jump were correct, the function would return
CF set/AX=0001h as for Windows95
SeeAlso: AX=1230h,AX=1200h
--------O-2F1250-----------------------------
INT 2F U - PTS-DOS - SET MACHINE ID
AX = 1250h
???
Return: ???
Note: This is known to be supported by Paragon Technology Systems PTS-DOS
sometime before 6.51, but is known not to be supported by S/DOS 1.0
(which derived from PTS-DOS 6.51)
SeeAlso: AX=1251h
--------O-2F1251-----------------------------
INT 2F U - PTS-DOS - GET MACHINE ID
AX = 1251h
???
Return: ???
Note: This is known to be supported by Paragon Technology Systems PTS-DOS
sometime before 6.51, but is known not to be supported by S/DOS 1.0
(which derived from PTS-DOS 6.51)
SeeAlso: AX=1250h
--------O-2F1252-----------------------------
INT 2F U - PTS-DOS 6.51, S/DOS 1.0+ - SET SFT INCREMENT
AX = 1252h
BX = new SFT increment
Return: ???
Note: This function is known to be supported by Paragon Technology Systems
PTS-DOS 6.51 and S/DOS 1.0 and probably was also supported
in earlier releases.
SeeAlso: AX=1253h
--------O-2F1253-----------------------------
INT 2F U - PTS-DOS 6.51, S/DOS 1.0+ - GET SFT INCREMENT
AX = 1253h
Return: BX = current SFT increment
AX = ???
Note: This function is known to be supported by Paragon Technology Systems
PTS-DOS 6.51 and S/DOS 1.0 and probably was also supported
in earlier releases.
SeeAlso: AX=1252h
--------O-2F1260-----------------------------
INT 2F C - PTS-DOS 6.51, S/DOS 1.0+ - "EMPTY" (RESERVED FOR INPUT STRING)
AX = 1260h
ES:DI -> string buffer (see getstr)
DL = extended keystroke code or FFh if ENTER
Return: AX = 0000h (default handler in the kernel)
CF set if action done, all registers preserved
Notes: This function is known to be handled by Paragon Technology Systems
PTS-DOS 6.51 and S/DOS 1.0, and probably was also handled
in earlier releases.
The default handler in the kernel justs XORs AX,AX and returns.
This is reserved to be invoked in input string
--------O-2F1261-----------------------------
INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - GET FIRST UMB
AX = 1261h
Return: AX = address of first UMB or 1 if invalid function.
Note: This function is known to be supported by Paragon Technology Systems
PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported
in earlier releases.
--------O-2F1262-----------------------------
INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - GET DOS COLOR
AX = 1262h
Return: AL = current video attribute used by DOS functions
Note: This function is known to be supported by Paragon Technology Systems
PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported
in earlier releases.
SeeAlso: AX=1263h
--------O-2F1263-----------------------------
INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - SET DOS COLOR
AX = 1263h
DL = new video attribute to be used by DOS functions
Return: ???
Note: This function is known to be supported by Paragon Technology Systems
PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported
in earlier releases.
SeeAlso: AX=1262h
--------O-2F1270-----------------------------
INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - "SYSBELL" - EMIT A BEEP
AX = 1270h
Return: ???
Note: This function is known to be supported by Paragon Technology Systems
PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported
in earlier releases.
SeeAlso: AX=1271h
--------O-2F1271-----------------------------
INT 2F C - PTS-DOS, S/DOS - RESERVED FOR BEEP
AX = 1271h
Return: ???
Note: According to the Paragon Technology Systems S/DOS 1.0 sources,
which derived from PTS-DOS 6.51, this is reserved for a "BEEP"
function. However, S/DOS 1.0 does not handle this function by
itself.
SeeAlso: AX=1270h
--------O-2F12F0-----------------------------
INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - BACKDOOR INTERCEPT INT 2Fh CHAIN
AX = 12F0h
CX:DX -> user INT 2F handler
CF set
Return: CF clear if successful
CX:DX -> previous INT 2F handler
CF set on error
Notes: This function is known to be supported by Paragon Technology Systems
PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported
in earlier releases. It is handled from within the kernel's
INT 2Fh dispatcher.
Resident system extensions should call INT 2Fh/12F0h to intercept
the INT 2Fh chain. The main idea of this call is to allow them to
be moved to the HMA and intercept INT 2Fh without querying A20 state
and without interception of the INT2Fh vector. This is why the
"Chain2F" variable must be instanced by placing it to the SDA.
On chain entry of the far procedure, CF must be set. All registers
except for AX, BP, and DS remain unchanged. If a handler cannot
process the call, it must set CF and do a far jump to the previous
one in the chain in order to indicate an error. If CF is still set
on exit, the call will be ignored.
--------O-2F12F1-----------------------------
INT 2F - PTS-DOS, S/DOS - RESERVED
AX = 12F1h-12FFh
Return: ???
Note: According to the Paragon Technology Systems S/DOS 1.0 sources,
which derived from PTS-DOS 6.51, these functions are reserved for
future use. However, S/DOS 1.0 does not make use of them itself.
--------O-2F12FFBL00-------------------------
INT 2F - FreeDOS - FDAK-DDT - INSTALLATION CHECK / STATUS CHECK
AX = 12FFh
BL = 00h
Return: AL = DDh if installed
BH = state (00h disabled, nonzero enabled)
BL = readonly flag (00h writable, nonzero read-only)
Program: FDAK-DDT is the FreeDOS Alternative Kernel Device Drivers Testing
release by Yury A. Semenov
SeeAlso: AX=12FFh/BL=07h
--------O-2F12FFBL01-------------------------
INT 2F - FreeDOS - FDAK-DDT - ENABLE FDAK DRIVERS
AX = 12FFh
BL = 01h
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=02h
--------O-2F12FFBL02-------------------------
INT 2F - FreeDOS - FDAK-DDT - DISABLE FDAK DRIVERS
AX = 12FFh
BL = 02h
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=01h
--------O-2F12FFBL03-------------------------
INT 2F - FreeDOS - FDAK-DDT - SWITCH BLOCK DEVICE TO READ-ONLY
AX = 12FFh
BL = 03h
???
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=04h
--------O-2F12FFBL04-------------------------
INT 2F - FreeDOS - FDAK-DDT - SWITCH BLOCK DEVICE TO READ-WRITE
AX = 12FFh
BL = 04h
???
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=03h
--------O-2F12FFBL05-------------------------
INT 2F - FreeDOS - FDAK-DDT - TURN ACTIVITY INDICATOR ON
AX = 12FFh
BL = 05h
Note: not yet implemented as of January 1996
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=06h
--------O-2F12FFBL06-------------------------
INT 2F - FreeDOS - FDAK-DDT - TURN ACTIVITY INDICATOR OFF
AX = 12FFh
BL = 06h
Note: not yet implemented as of January 1996
SeeAlso: AX=12FFh/BL=00h,AX=12FFh/BL=05h
--------O-2F12FFBL07-------------------------
INT 2F - FreeDOS - FDAK-DDT - UNINSTALL
AX = 12FFh
BL = 07h
Return: ES = segment of FDAK memory block
Note: the caller must free the memory block returned in ES
(via INT 21/AH=49h)
SeeAlso: AX=12FFh/BL=00h
--------O-2F12FFBX0000-----------------------
INT 2F U - DR DOS 6.0+ IBMBIO.COM - QUERY SIZE OF THE BDOS
AX = 12FFh
BX = 0000h
Return: AX = 0000h if supported
DX = size of the BDOS in paragraphs
Flags trashed
ES,CL destroyed (DR PalmDOS)
Note: This API is provided by IBMBIO.COM for the initialization phase
of drivers loaded via DEVICE=/HIDEVICE=/DEVICEHIGH= directives and
is only available during these short time intervals. It is called
by DR DOS 6.0 EMM386.SYS and Novell DOS 7+ EMM386.EXE to query the
size of the BDOS kernel (the resident code of IBMDOS.COM).
SeeAlso: AX=12FFh/BX=0001h,AX=12FFh/BX=0002h
--------O-2F12FFBX0001-----------------------
INT 2F U - DR DOS 6.0+ IBMBIO.COM - RELOCATE THE BDOS
AX = 12FFh
BX = 0001h
CX = 0000h (DR PalmDOS)
DX = segment to relocate to (FFFFh for HMA)
Return: AX = 0000h if supported
Flags trashed
BX,CX,DX,DI,SI,DS,ES destroyed (DR PalmDOS)
Notes: This API is provided by IBMBIO.COM for the initialization phase
of drivers loaded via DEVICE=/HIDEVICE=/DEVICEHIGH= directives and
is only available during these short time intervals. It is initiated
by DR DOS 6.0 EMM386.SYS and Novell DOS 7+ EMM386.EXE to relocate
the BDOS kernel (e.g. into the HMA).
This call is also issued by DR PalmDOS IBMBIO.COM which explicitly
clears CX.
Under Novell DOS 7+ the actual relocation takes place at a later
stage, but under DR PalmDOS the BDOS is relocated immediately.
SeeAlso: AX=12FFh/BX=0000h,AX=12FFh/BX=0003h
--------O-2F12FFBX0002-----------------------
INT 2F U - DR DOS 6.0+ IBMBIO.COM - QUERY SIZE OF THE BIOS
AX = 12FFh
BX = 0002h
Return: AX = 0000h if supported
DX = size of the DOS BIOS in paragraphs
CL and flags trashed
Note: This API is provided by IBMBIO.COM for the initialization phase
of drivers loaded via DEVICE=/HIDEVICE=/DEVICEHIGH= directives and
is only available during these short time intervals. It is called
by DR DOS 6.0 EMM386.SYS and Novell DOS 7 EMM386.EXE to query the
size of the DOS BIOS (the resident code of IBMBIO.COM).
SeeAlso: AX=12FFh/BX=0000h,AX=12FFh/BX=0003h
--------O-2F12FFBX0003-----------------------
INT 2F U - DR DOS 6.0+ IBMBIO.COM - RELOCATE THE BIOS
AX = 12FFh
BX = 0003h
CX = 0000h (DR PalmDOS)
DX = segment to relocate to (FFFFh for HMA)
Return: AX = 0000h if supported
Flags trashed
Notes: This API is provided by IBMBIO.COM for the initialization phase
is only available during these short time intervals. It is initiated
by DR DOS 6.0 EMM386.SYS and Novell DOS 7 EMM386.EXE to relocate the
resident part of the DOS BIOS. The actual relocation takes place at
a later stage.
This call is also issued by DR PalmDOS IBMBIO.COM which explicitly
clears CX.
SeeAlso: AX=12FFh/BX=0001h,AX=12FFh/BX=0002h
--------O-2F12FFBX0005-----------------------
INT 2F U - DR DOS 6.0+ - BOOT PHASE BROADCASTS FOR MEMORYMAX/RPLOADER/SECURITY
AX = 12FFh
BX = 0005h
CX = 0000h
DX = function
0000h MemoryMAX cleanup broadcast
0001h RPLOADER broadcast
!!! details to follow
Note: called at three separate points inside IBMBIO.COM
--------m-2F12FFBX0006-----------------------
INT 2F U - DR DOS 6+, Novell DOS 7+ - EMM386.EXE - VIDEO MEMORY SPACE CONTROL
AX = 12FFh
BX = 0006h
DX = 0000h
CX = function
0000h get status of video memory space (MEMMAX /V)
0001h map memory into video memory space (MEMMAX +V)
0002h unmap memory from video memory space (MEMMAX -V)
Return: CF clear if successful
AX = 0000h (successful)
BX = segment of reserved video RAM
CX = segment of used video RAM
DX = segment of first upper MCB
Notes: this functionality is provided by EMM386, and partially supported by
HIDOS.SYS
BL specifies which program handles the call, BH is the function number
BUG: 4DOS 5.51(a) often hangs the system (reported to be reproducable), if
MEMMAX +V is issued from the 4DOS prompt. To avoid this, one should
temporary load COMMAND.COM followed by MEMMAX +v , starting the
application, MEMMAX -v and EXIT. 4DOS 5.5c does not show this
phenomena on the same systems where 5.51a hangs.
SeeAlso: AX=D201h/BX=4849h
(Table 04105)
Values for DR DOS memory space control error code:
00h successful
80h video memory already unmapped
81h video memory already mapped
82h no video memory reserved (/VIDEO not specified)
83h video memory in use (graphics mode or non-standard text mode)
84h mapped video memory contains allocated arena(s)
85h hardware error
86h driver requires protected mode but is permanently in real mode
("EMM386 OFF")
--------O-2F12FFBX0007-----------------------
INT 2F U - Novell DOS 7 - SCRIPT.EXE - GET ???
AX = 12FFh
BX = 0007h
CX = 0000h
Return: CF clear if installed
AX = 0000h
BX = ??? (4426h)
CX = ??? (0068h)
DX = PSP segment of resident code???
SI = ??? (4AFAh)
ES = resident code segment
--------O-2F12FFBX0009-----------------------
INT 2F - DR DOS 6.0+ IBMBIO.COM - REGISTER ROOT OF UPPER MEMORY LINK
AX = 12FFh
BX = 0009h
DX = new value for root segment of upper memory link
Return: AX = 0000h if supported
ES:BX modified
Notes: the DX value is stored at offset 66h in SYSVARS (see INT 21h/AH=52h)
and offset 18h in the Novell DOS 7 internal variable table
(see INT 21/AX=4458h)
This API is provided by IBMBIO.COM for the initialization phase
of drivers loaded via DEVICE=/HIDEVICE=/DEVICEHIGH= directives and
is only available during these short time intervals. It is probably
initiated by the Novell DOS 7+ EMM386.EXE.
this function has apparently been supported since DR DOS 6.0 "Buxton"
of 1991/03/19
for Novell DOS 7, ES:BX points at the internal variable table DRDAT,
but this may change in future releases
--------m-2F12FFBX0106-----------------------
INT 2F U - Novell DOS 7+ - MEMORYMAX INSTALLATION CHECK
AX = 12FFh
BX = 0106h
Return: CF clear if successful
AX = 0000h (successful)
BX = EDC0h (signature "European Development Centre")
CL = memory manager variant
00h if HIMEM.SYS present
01h if EMMXMA.SYS present
02h if EMM386.EXE present (DPMI/VCPI disabled)
03h if multitasking EMM386.EXE present (DPMI/VCPI loaded)
CH = ??? (00h)
DX = binary driver version, DH is major, DL is minor
ES = segment of EMM386 device driver header (low-memory stub)
CF set on error
AX = 0001h
Notes: BL specifies which program handles the call, BH is the function number
if the word at ES:0012h is nonzero, if contains the offset within
segment ES of the CEMM-compatible entry point (see #02617)
if no other program has hooked INT 67, an alternate installation
check is to test for the string
"NOVELL EXPANDED MEMORY MANAGER 386" at offset 14h in the INT 67
handler's segment; the word immediately preceding this string
contains the offset of the API entry point if it is nonzero
Index: entry point;Novell EMM386
(Table 02617)
Call Novell EMM386.EXE entry point with:
AH = 00h get memory manager's status???
???
AH = 01h set memory manager's status???
???
AH = 02h Weitek coprocessor support???
AL = subfunction???
more functions???
SeeAlso: #01513 at INT 21/AX=4402h/SF=02h,#03666 at INT 67/AX=FFA5h
--------m-2F12FFBX0206-----------------------
INT 2F - Novell DOS 7+ - MEMORYMAX GET PAGE TABLE ENTRY
AX = 12FFh
BX = 0206h
ESI = linear address
Return: CF clear if successful
AX = 0000h (successful)
CX = 0000h
EDI = page table entry
CF set on error
AX = function status
0000h function supported
CX error code
80h if linear address has no mapping
0001h (AX > 0) function not supported
CX undefined
Note: This function is supported by Novell DOS 7+ EMM386.EXE 3.0+ and
possibly by HIMEM.SYS 2.3+.
SeeAlso: AX=12FFh/BX=0306h
--------m-2F12FFBX0306-----------------------
INT 2F - Novell DOS 7+ - MEMORYMAX SET PAGE TABLE ENTRY
AX = 12FFh
BX = 0306h
ESI = linear address
EDI = page table entry
Return: CF clear if successful
AX = 0000h (successful)
CX = 0000h
CF set on error
AX = function status
0000h function supported
CX error code
80h if linear address has no mapping
0001h (AX > 0) function not supported
CX undefined
Note: This function is supported by Novell DOS 7+ EMM386.EXE 3.0+ and
possibly by HIMEM.SYS 2.3+.
SeeAlso: AX=12FFh/BX=0206h
--------m-2F12FFBX0406-----------------------
INT 2F - Novell DOS 7+ - MEMORYMAX CREATE ACCESS KEY
AX = 12FFh
BX = 0406h
Return: CF clear if successful
AX = 0000h (successful)
CX = 0000h
SI:DI = access key
CF set on error
AX = function status
0000h function supported
CX error code
80h if access key already exists
0001h (AX > 0) function not supported
CX undefined
Note: This function is supported by Novell DOS 7+ EMM386.EXE 3.0+ and
possibly by HIMEM.SYS 2.3+.
SeeAlso: AX=12FFh/BX=0506h
--------m-2F12FFBX0506-----------------------
INT 2F - Novell DOS 7+ - MEMORYMAX DESTROY ACCESS KEY
AX = 12FFh
BX = 0506h
SI:DI = access key
Return: CF clear if successful
AX = 0000h (successful)
CX = 0000h
CF set on error
AX = function status
0000h function supported
CX error code
80h if invalid access key
81h if no access key exists
0001h (AX > 0) function not supported
CX undefined
Note: This function is supported by Novell DOS 7+ EMM386.EXE 3.0+ and
possibly by HIMEM.SYS 2.3+.
SeeAlso: AX=12FFh/BX=0406h
--------m-2F12FFBL06-------------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - ???
AX = 12FFh
BL = 06h
BH = function (06h-09h)
???
Return: CF clear if successful
CF set on error
AX = function status
0000h function supported
CX error code
0001h (AX > 0) function not supported
CX undefined
--------O-2F12FFBX0EDC-----------------------
INT 2F U - Novell DOS 7 - EMM386.EXE - CHECK IF MULTITASKING SUPPORT LOADED???
AX = 12FFh
BX = 0EDCh ('EDC' = Novell European Development Center)
Return: AX = 0000h if ??? loaded
CF clear
BX = 0000h
Notes: called by Novell DOS 7 TaskMgr
if this function returns with AX=0000h, then the code necessary to
support the API on INT 2F/AX=2780h is loaded and that API becomes
available for use
because the request is handled on the initial trap to the memory
manager caused by INT instructions, this function must be invoked
with an actual INT 2F instruction instead of some simulation such
as a far call to the address in the interrupt vector table
SeeAlso: AX=2780h/CL=01h,AX=2780h/CL=02h,AX=2780h/CL=03h,AX=2780h/CL=04h
--------D-2F13-------------------------------
INT 2F U - DOS 3.2+ - SET DISK INTERRUPT HANDLER
AH = 13h
DS:DX -> interrupt handler disk driver calls on read/write
ES:BX = address to restore INT 13 to on system halt (exit from root
shell) or warm boot (INT 19)
Return: DS:DX set by previous invocation of this function
ES:BX set by previous invocation of this function
Notes: IO.SYS hooks INT 13 and inserts one or more filters ahead of the
original INT 13 handler. The first is for disk change detection
on floppy drives, the second is for tracking formatting calls and
correcting DMA boundary errors, the third is for working around
problems in a particular version of IBM's ROM BIOS
before the first call, ES:BX points at the original BIOS INT 13; DS:DX
also points there unless IO.SYS has installed a special filter for
hard disk reads (on systems with model byte FCh and BIOS date
"01/10/84" only), in which case it points at the special filter
most DOS 3.2+ disk access is via the vector in DS:DX, although a few
functions are still invoked via an INT 13 instruction
during Windows 3.1 startup this function seems to be used to
temporarily point DOS to a dummy handler in WDCTRL.386 which always
halts the system with a fatal error message. If DS hasn't changed
on return from the function, Windows will display the error message
"Invalid DOS version".
this is a dangerous security loophole for any virus-monitoring software
which does not trap this call ("INT13", "Nomenklatura", and many
Bulgarian viruses are known to use it to get the original ROM entry
point)
the preloadable Novell DOS 7+ SECURITY.BIN driver $SECURE$ traps
this call.
BUG: Novell DOS 7 IBMBIO.COM before 1995-05-08 trashed AX on return from
this function. VGACOPY by Thomas M�nkemeier's VGA Software GmbH
crashed due to this. Later releases of Novell DOS 7 preserved the
contents of the AX register.
SeeAlso: INT 13/AH=01h,INT 19,INT 9D"VIRUS"
--------N-2F13-------------------------------
INT 2F U - MS-NET - ???
AH = 13h
???
Return: ???
Note: supposedly used to move (or control the movement of) NCBs
--------U-2F1400-----------------------------
INT 2F C - NLSFUNC.COM - INSTALLATION CHECK
AX = 1400h
BX <> 0EDCh
Return: AL = status
00h not installed, OK to install
01h not installed, not OK to install
FFh installed
Notes: this function is called by the DOS v3.3+ kernel
supported by OS/2 v1.3+ compatibility box, which always returns AL=FFh
supported by DR DOS 5.0+ NLSFUNC v3.0+
documented for MS-DOS 5+, but undocumented in prior versions
DR DOS 5.0+ NLSFUNC 3.00+ returns CF set and AX=0001h, if AL was not
00h, FEh, or FFh on entry.
SeeAlso: AX=1400h/BX=0EDCh,AX=1401h"NLSFUNC",AX=1402h"NLSFUNC"
----------2F1400BX0EDC-----------------------
INT 2Fh - DR-DOS NLSFUNC 4.01+ - ENHANCED INSTALLATION CHECK
AX = 1400h
BX = 0EDCh
Return: AL = status
00h not installed, OK to install
01h not installed, not OK to install
(for example under a multitasker)
FFh installed
ES:DI -> version signature ("4.01$".."4.04$" for 4.01..4.04)
flags may be destroyed
Program: NLSFUNC 4.01+ is currently an independent project under
development by Matthias Paul. It is not yet publically available,
but as NLSFUNC 4.00 did, it will probably become available with
future DR-DOS releases.
Notes: If BX <> 0EDCh on entry, DR-DOS NLSFUNC 4.01+ performs the standard
installation check (INT 2F/AX=1400h), and does not change ES:DI.
DR DOS 5.0+ NLSFUNC 3.00+ returns CF set and AX=0001h, if AL was not
00h, FEh, or FFh on entry.
NLSFUNC 4.01+ will use the ES:DI enhancement to check the driver
version and calculate displacements into the resident driver for
runtime updates of internal structures like the local NLS database
filespec, etc.
If the returned ES points into the HMA (ES=FFFEh) care should be taken
to actually access the HMA while checking the version signature and
updating resident data (mutex with local A20 enable/disable).
While previous issues of NLSFUNC installed under a multitasker,
DR-DOS NLSFUNC 4.01+ will actually adapt to work properly in this
environment.
SeeAlso: AX=1400h"NLSFUNC.COM",AX=14FEh,AX=14FFh,INT 21/AH=65h
--------D-2F1400-----------------------------
INT 2F - European MS-DOS 4.0 POPUP - "CheckPu" - INSTALLATION CHECK
AX = 1400h
Return: AX = FFFFh if installed
BX = maximum memory required to save screen and keyboard info
CF clear if successful
CF set on error
AX = error code
0002h invalid function
0004h unknown error
Note: the POPUP interface is used by background programs (see INT 21/AH=80h)
to communicate with the user
SeeAlso: AX=1401h"POPUP",AX=1402h"POPUP",AX=1403h"POPUP"
--------U-2F1401-----------------------------
INT 2F CU - NLSFUNC.COM - CHANGE CODE PAGE
AX = 1401h
DS:SI -> internal code page structure (see #02618)
BX = new code page (see #01757 at INT 21/AX=6602h)
DX = country code???
Return: AL = status
00h successful
else DOS error code
Note: this function is called by the DOS v3.3+ kernel
SeeAlso: AX=1400h"NLSFUNC",AX=1402h"NLSFUNC",INT 21/AH=66h
Format of DOS 3.30 internal code page structure:
Offset Size Description (Table 02618)
00h 8 BYTEs ???
08h 64 BYTEs name of country information file (see #02619)
48h WORD system code page (see #01757 at INT 21/AX=6602h)
4Ah WORD number of supported subfunctions
4Ch 5 BYTEs data to return for INT 21/AX=6502h
51h 5 BYTEs data to return for INT 21/AX=6504h
56h 5 BYTEs data to return for INT 21/AX=6505h
5Bh 5 BYTEs data to return for INT 21/AX=6506h
60h 41 BYTEs data to return for INT 21/AX=6501h
Format of MS-DOS/PC-DOS/OS2/WinNT/PTS-DOS COUNTRY.SYS file:
Offset Size Description (Table 02619)
00h BYTE ID tag (FFh)
01h 7 BYTEs ASCII "COUNTRY"
08h 8 BYTEs ??? (00h)
10h BYTE ??? (01h)
11h BYTE ??? (00h)
12h BYTE ??? (01h)
13h DWORD offset of first entry in file (see #02620)
SeeAlso: #02623
Format of MS-DOS/PC-DOS/OS2/WinNT/PTS-DOS COUNTRY.SYS entry:
Offset Size Description (Table 02620)
00h WORD number of country-codepage entries following
02h N Country-Codepage entries:
Offset Size Description
00h WORD length of entry, not counting this word (000Ch)
02h WORD country ID
04h WORD codepage ID
06h WORD ??? (0000h)
08h WORD ??? (0000h)
0Ah DWORD offset of country-subfunction-header in file
(see #02621)
Notes: multiple codepages for a country are stored consecutively
PTS/DOS places a copyright string immediately following this structure,
though a copyright at the end of the file is preferable
SeeAlso: #02619
Format of MS-DOS/PC-DOS/OS2/WinNT/PTS-DOS COUNTRY.SYS country-subfunc header:
Offset Size Description (Table 02621)
00h WORD number of subfunction entries following
02h N subfunction entries
Offset Size Description
00h WORD length of subfunction entry, not counting this
word (usually 06h)
02h WORD subfunction ID
(value passed to INT 21/AH=65h in AL)
04h DWORD offset within file of subfunction data entry
(see #02622)
SeeAlso: #02620
Format of MS-DOS/PC-DOS/OS2/WinNT/PTS-DOS COUNTRY.SYS country-subfunc data::
Offset Size Description (Table 02622)
00h BYTE ID-tag (FFh)
01h 7 BYTEs table-type signature (blank-padded)
"CTYINFO" general country info (subfn 01h)
"UCASE " uppercase table (subfn 02h)
"LCASE " lowercase table (subfn 03h) (DOS 6.2_)
"FUCASE " filename uppercase table (subfn 04h)
"FCHAR " filename terminator table (subfn 05h)
"COLLATE" collating sequence (subfn 06h)
"DBCS " double-byte character table (subfn 07h)
08h WORD length of following table in bytes
(if 0000h for DBCS table, there will still be a word of 0000h)
---country info (01h)---
0Ah WORD country ID (see #01400 at AH=38h)
0Ch WORD code page (see #01757)
0Eh 34 BYTEs country-dependent info (see #01399 at AH=38h)
---uppercase table (02h)---
0Ah 128 BYTEs uppercase equivalents (if any) of chars 80h to FFh
---lowercase table (03h)---
0Ah 256 BYTEs lowercase equivalents (if any) of chars 00h to FFh
---filename uppercase table (04h)---
0Ah 128 BYTEs uppercase equivalents (if any) of chars 80h to FFh
---filename terminator table (05h)---
0Ah BYTE ??? (01h for MS-DOS 3.30-6.00)
0Bh BYTE lowest permissible character value for filename
0Ch BYTE highest permissible character value for filename
0Dh BYTE ??? (00h for MS-DOS 3.30-6.00)
0Eh BYTE first excluded character in range \ all characters in this
0Fh BYTE last excluded character in range / range are illegal
10h BYTE ??? (02h for MS-DOS 3.30-6.00)
11h BYTE number of illegal (terminator) characters
12h N BYTEs characters which terminate a filename: ."/\[]:|<>+=;,
---collating sequence (06h)---
0Ah 256 BYTEs values used to sort characters 00h to FFh
---DBCS table (07h)---
0Ah 2N BYTEs start/end for N lead byte ranges
WORD 0000h (end of table)
SeeAlso: #02621,#01750,#01751,#01753,#01754,#01755,#01756
Format of DR DOS/Novell DOS/OpenDOS COUNTRY.SYS file:
Offset Size Description (Table 02623)
00h 126 BYTEs copyright notice (terminated with Ctrl-Z; NUL-padded)
the copyright notice starts with the signature
"COUNTRY.SYS Rx.xx" where "x.xx" indicates the file format
revision, which is checked by the OS (revision is 2.00 for
DR DOS 3.41 and 2.01 for all newer versions of DR DOS,
Novell DOS, and OpenDOS)
7Eh WORD signature of file format revision
0EDCh = 2.00 (DR DOS 3.41)
EDC1h = 2.01 (all newer versions)
80h var country pointer records (see #02624)
(packed array of variable-size records)
SeeAlso: #02619
Format of DR DOS/Novell DOS/OpenDOS COUNTRY.SYS country pointer record::
Offset Size Description (Table 02624)
00h WORD country code (0000h if end of array)
02h WORD code page (see #01757)
04h WORD ??? (0000h)
06h 7 WORDs offsets in file for INT 21/AH=65h subfunctions 01h to 07h, or
0000h if no table for that subfunction
14h var country information
Notes: the end-of-file marker is a country pointer record filled entirely with
zeros
the data at which the pointers point is in the same format as the
tables returned by INT 21/AH=65h, except that the general-info
table for subfunction 01h does not contain the length word at the
beginning
SeeAlso: #02623
--------D-2F1401-----------------------------
INT 2F - European MS-DOS 4.0 POPUP - "PostPu" - OPEN/CLOSE POPUP SCREEN
AX = 1401h
DL = function (00h open, 01h close)
DH = wait flag
00h block until screen opens
01h return error if screen is not available
02h urgent--always open screen immediately
Return: CF clear if successful
BX = amount of memory needed to save screen and keyboard info,
0000h if default save location can be used (only if DH was 02h)
CF set on error
Note: the application using the screen is frozen until the popup screen is
closed
SeeAlso: AX=1400h"POPUP",AX=1402h"POPUP",AX=1403h"POPUP"
--------U-2F1402-----------------------------
INT 2F CU - NLSFUNC.COM - GET EXTENDED COUNTRY INFO
AX = 1402h
BP = subfunction (same as AL for INT 21/AH=65h)
BX = code page (see #01757 at INT 21/AX=6602h)
DX = country code (see #01400 at INT 21/AH=38h)
DS:SI -> internal code page structure (see #02618)
ES:DI -> user buffer
CX = size of user buffer
Return: AL = status
00h successful
else DOS error code
Notes: this function is called by the DOS v3.3+ kernel on INT 21/AH=65h
code page structure apparently only needed for COUNTRY.SYS pathname
SeeAlso: AX=1401h"NLSFUNC",AX=1403h"NLSFUNC",AX=1404h,INT 21/AH=65h
--------D-2F1402-----------------------------
INT 2F - European MS-DOS 4.0 POPUP - "SavePu" - SAVE POPUP SCREEN
AX = 1402h
ES:DI -> save buffer (0000h:0000h for default buffer in POPUP)
Return: CF clear if successful
CF set on error
AX = error code (see #02625)
SeeAlso: AX=1400h"POPUP",AX=1401h"POPUP",AX=1403h"POPUP"
(Table 02625)
Values for POPUP error code:
0001h process does not own screen
0004h unknown error
0005h invalid pointer
--------U-2F1403-----------------------------
INT 2F CU - NLSFUNC.COM - SET CODE PAGE
AX = 1403h
DS:SI -> internal code page structure (see #02618)
BX = code page (see #01757 at INT 21/AX=6602h)
DX = country code (see #01400 at INT 21/AH=38h)
Return: AL = status
???
Note: this function is called by the DOS v3.3+ kernel on INT 21/AH=38h
SeeAlso: AX=1402h"NLSFUNC",AX=1404h,INT 21/AH=38h"SET"
--------D-2F1403-----------------------------
INT 2F - European MS-DOS 4.0 POPUP - "RestorePu" - RESTORE SCREEN
AX = 1403h
ES:DI -> buffer containing saved screen
(0000h:0000h for default buffer in POPUP)
Return: CF clear if successful
CF set on error
AX = error code (see #02625)
SeeAlso: AX=1400h"POPUP",AX=1401h"POPUP",AX=1402h"POPUP"
--------U-2F1404-----------------------------
INT 2F CU - NLSFUNC.COM - GET COUNTRY INFO
AX = 1404h
BX = code page (see #01757 at INT 21/AX=6602h)
DX = country code (see #01400 at INT 21/AH=38h)
DS:SI -> internal code page structure (see #02618)
ES:DI -> user buffer
Return: AL = status
???
Notes: this function is called by the DOS v3.3+ kernel on INT 21/AH=38h
code page structure apparently only needed for COUNTRY.SYS pathname
SeeAlso: AX=1402h,AX=1403h,INT 21/AH=38h"GET"
--------U-2F14FE-----------------------------
INT 2F U - DR DOS 5.0 NLSFUNC - GET EXTENDED COUNTRY INFORMATION
AX = 14FEh
BX = code page (FFFFh=global code page) (see #01757 at INT 21/AX=6602h)
DX = country ID (FFFFh=current country) (see #01400 at INT 21/AH=38h)
ES:DI -> country information buffer
CL = info ID
01h get general internationalization info
02h get pointer to uppercase table
04h get pointer to filename uppercase table
05h get pointer to filename terminator table
06h get pointer to collating sequence table
07h get pointer to Double-Byte Character Set table
CF set (used to return error if not installed)
Return: CF clear if successful
DS:SI -> requested information
CF set on error
Notes: DR DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh,
or FFh on entry.
the DR DOS kernel calls this function on INT 21/AX=6501h
the value in CL is not range-checked by the DR DOS 5.0 NLSFUNC
SeeAlso: #02626,AX=14FFh,INT 21/AH=65h
Format of DR DOS COUNTRY.SYS file:
Offset Size Description (Table 02626)
00h 126 BYTEs copyright notice (terminated with Ctrl-Z, padded with NULs)
7Eh WORD signature EDC1h
80h var country pointer records
Offset Size Description
00h WORD country code (0000h if end of array)
02h WORD code page (see #01757 at INT 21/AX=6602h)
04h WORD ??? (0000h)
06h 7 WORDs offsets in file for data tables for subfunctions
01h-07h
var var country information
--------U-2F14FF-----------------------------
INT 2F U - DR DOS 5.0+ NLSFUNC - PREPARE CODE PAGE
AX = 14FFh
BX = code page (see #01757 at INT 21/AX=6602h)
Return: AX = ???
ZF set if AX=0000h
Notes: DR DOS 5.0 NLSFUNC returns CF set and AX=0001h if AL was not 00h, FEh,
or FFh on entry.
passes codepage preparation request to each character device supporting
the generic IOCTL call
BUG: DR DOS 5.0 NLSFUNC 3.00 - Novell DOS 7 NLSFUNC 3.03, and OpenDOS 7.01 -
DR-OpenDOS 7.02 NLSFUNC 3.02 requires DF cleared on entry, otherwise
the system may crash. However, since this function is called only by
the BDOS, the problem never actually occurs. DR-DOS 7.02/7.03
NLSFUNC 4.00+ always clears DF by itself.
SeeAlso: AX=1400h/BX=0EDCh,AX=14FEh,INT 21/AX=440Ch,INT 21/AX=6602h
--------U-2F1500-----------------------------
INT 2F - DOS 4.00 GRAPHICS.COM - INSTALLATION CHECK
AX = 1500h
Return: AX = FFFFh
ES:DI -> ??? (graphics data?)
Note: this installation check conflicts with the CD-ROM Extensions
installation check; moved to AX=AC00h in later versions
SeeAlso: AX=AC00h
--------d-2F1500BX0000-----------------------
INT 2F - CD-ROM - INSTALLATION CHECK
AX = 1500h
BX = 0000h
Return: BX = number of CD-ROM drive letters used
CX = starting drive letter (0=A:)
AX = 15FFh (Novell DOS 7 NWCDEX only!)
Notes: this installation check DOES NOT follow the format used by other
software
this installation check conflicts with the DOS 4.00 GRAPHICS.COM
installation check
BUG: this function may return an incorrect starting drive letter when
INTERLNK is installed
SeeAlso: AX=150Ch,AX=15FFh,INT 2F/AX=D000h"Lotus"
--------c-2F1500CH90-------------------------
INT 2F U - CDBLITZ v2.11 - INSTALLATION CHECK
AX = 1500h
CH = 90h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CX = 1234h if installed
CF clear
DX = BCD version number (DH = major, DL = minor)
Program: CDBLITZ is a CD-ROM cache by Blitz 'n' Software, Inc.
SeeAlso: AX=1500h/CH=99h
--------c-2F1500CH91-------------------------
INT 2F U - CDBLITZ v2.11 - GET STATISTICS
AX = 1500h
CH = 91h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
ES:BX -> statistics record (see #02627)
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=97h
Format of CDBLITZ statistics record:
Offset Size Description (Table 02627)
00h WORD cache mode (see also AX=1500h/CH=94h)
0001h 'min', 0002h 'max'
02h DWORD number of read calls???
06h DWORD total number of sectors read
0Ah DWORD unused??? (zero)
0Eh DWORD number of cache hit sectors
12h WORD cache size in KB
14h WORD unused??? (zero)
16h WORD cache state (0000h disabled, 0001h enabled)
--------c-2F1500CH92-------------------------
INT 2F U - CDBLITZ v2.11 - ENABLE CACHE
AX = 1500h
CH = 92h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=93h,AX=1500h/CH=94h
--------c-2F1500CH93-------------------------
INT 2F U - CDBLITZ v2.11 - DISABLE CACHE
AX = 1500h
CH = 93h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=92h,AX=1500h/CH=95h
--------c-2F1500CH94-------------------------
INT 2F U - CDBLITZ v2.11 - SET 'MAX' MODE (CACHE BOTH DIRECTORIES AND DATA)
AX = 1500h
CH = 94h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=92h,AX=1500h/CH=95h
--------c-2F1500CH95-------------------------
INT 2F U - CDBLITZ v2.11 - SET 'MIN' MODE (CACHE ONLY DIRECTORY ENTRIES)
AX = 1500h
CH = 95h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=94h
--------c-2F1500CH96-------------------------
INT 2F U - CDBLITZ v2.11 - FLUSH CACHE
AX = 1500h
CH = 96h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
Note: this function resets the counts for number of sectors read and number
of cache hits, but no other values in the statistics record
(see #02627)
SeeAlso: AX=1500h/CH=90h
--------c-2F1500CH97-------------------------
INT 2F U - CDBLITZ v2.11 - GET CACHE STATISTICS
AX = 1500h
CH = 97h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
AL = cache mode (01h 'min', 02h 'max') (see also AX=1500h/CH=94h)
AH = cache state (00h disabled, 01h enabled)
BX = cache size in KB
DX:CX = total number of reads
DI:SI = number of cache hits
SeeAlso: AX=1500h/CH=90h,AX=1500h/CH=91h
--------c-2F1500CH99-------------------------
INT 2F U - CDBLITZ v2.11 - UNINSTALL
AX = 1500h
CH = 99h (function number)
BX = 1234h (magic value for CDBLITZ)
Return: CF clear
???
Program: CDBLITZ is a CD-ROM cache by Blitz 'n' Software, Inc.
SeeAlso: AX=1500h/CH=90h
--------d-2F1501-----------------------------
INT 2F - CD-ROM - GET DRIVE DEVICE LIST
AX = 1501h
ES:BX -> buffer to hold drive letter list (5 bytes per drive letter)
Return: buffer filled, for each drive letter
BYTE subunit number in driver
DWORD address of device driver header (see #01646)
Note: reportedly returns AX=0000h and an invalid address under Windows95;
other reports say it works fine
SeeAlso: AX=1510h
--------d-2F1502-----------------------------
INT 2F - CD-ROM - GET COPYRIGHT FILE NAME
AX = 1502h
ES:BX -> 38-byte buffer for name of copyright file
CX = drive number (0=A:)
Return: CF set if drive is not a CD-ROM drive
AX = 000Fh (invalid drive)
CF clear if successful
SeeAlso: AX=1503h
--------d-2F1503-----------------------------
INT 2F - CD-ROM - GET ABSTRACT FILE NAME
AX = 1503h
ES:BX -> 38-byte buffer for name of abstract file
CX = drive number (0=A:)
Return: CF set if drive is not a CD-ROM drive
AX = 000Fh (invalid drive)
CF clear if successful
SeeAlso: AX=1502h,AX=1504h
--------d-2F1504-----------------------------
INT 2F - CD-ROM - GET BIBLIOGRAPHIC DOC FILE NAME
AX = 1504h
ES:BX -> 38-byte buffer for name of bibliographic documentation file
CX = drive number (0=A:)
Return: CF set if drive is not a CD-ROM drive
AX = 000Fh (invalid drive)
CF clear if successful
SeeAlso: AX=1502h,AX=1503h
--------d-2F1505-----------------------------
INT 2F - CD-ROM - READ VTOC
AX = 1505h
ES:BX -> 2048-byte buffer
CX = drive number (0=A:)
DX = sector index (0=first volume descriptor,1=second,...)
Return: CF set on error
AX = error code (15=invalid drive,21=not ready)
CF clear if successful
AX = volume descriptor type (1=standard,FFh=terminator,0=other)
Note: This function was not supported by Novell DOS 7 NWCDEX prior to the
08/16/94 update
--------d-2F1506-----------------------------
INT 2F - CD-ROM - TURN DEBUGGING ON
AX = 1506h
BX = debugging function to enable
Note: reserved for development
SeeAlso: AX=1507h
--------d-2F1507-----------------------------
INT 2F - CD-ROM - TURN DEBUGGING OFF
AX = 1507h
BX = debugging function to disable
Note: reserved for development
SeeAlso: AX=1506h
--------d-2F1508-----------------------------
INT 2F - CD-ROM - ABSOLUTE DISK READ
AX = 1508h
ES:BX -> buffer
CX = drive number (0=A:)
SI:DI = starting sector number
DX = number of sectors to read
Return: CF set on error
AL = error code (0Fh invalid drive,15h not ready)
CF clear if successful
Note: returns error 15h (not ready) under Windows95 if the starting sector
number is less than 10h
SeeAlso: AX=1509h
--------d-2F1509-----------------------------
INT 2F - CD-ROM - ABSOLUTE DISK WRITE
AX = 1509h
ES:BX -> buffer
CX = drive number (0=A:)
SI:DI = starting sector number
DX = number of sectors to write
Note: corresponds to INT 26h and is currently reserved and nonfunctional,
but could be implemented for CD-R and CD-RW drives
SeeAlso: AX=1508h
--------d-2F150A-----------------------------
INT 2F - CD-ROM - RESERVED
AX = 150Ah
--------d-2F150B-----------------------------
INT 2F - CD-ROM v2.00+ - DRIVE CHECK
AX = 150Bh
CX = drive number (0=A:)
Return: BX = ADADh if MSCDEX.EXE installed
AX = support status
0000h if drive not supported
nonzero if supported
SeeAlso: AX=150Dh
--------d-2F150CBX0000-----------------------
INT 2F - CD-ROM v2.00+ - GET MSCDEX.EXE VERSION (GET VERSION)
AX = 150Ch
BX = 0000h
Return: BH = major version
BL = minor version
Notes: MSCDEX.EXE versions prior to 2.00 leave BX unchanged, thus BX should
be 0000h on entry
Corel's CORELCDX.COM v1.01d returns 2.20, v1.12a returns 2.21
Meridian Data's CDNETEX.EXE returns its own version number, e.g. 4.70
J.M.A. Hall's CDEMU2.COM returns 2.10 (it is an MSCDEX emulator for
networked CD-ROM drives)
Windows95 returns v2.95
Novell DOS 7 NWCDEX.EXE returns the same version number reported in
its startup message
SeeAlso: AX=1500h"CD-ROM",AX=15FFh"CORELCDX"
--------d-2F150D-----------------------------
INT 2F - CD-ROM v2.00+ - GET CD-ROM DRIVE LETTERS
AX = 150Dh
ES:BX -> buffer for drive letter list (1 byte per drive)
Return: buffer filled with drive numbers (0=A:). Each byte corresponds
to the drive in the same position for function 1501h
SeeAlso: AX=150Bh
--------d-2F150E-----------------------------
INT 2F - CD-ROM v2.00+ - GET/SET VOLUME DESCRIPTOR PREFERENCE
AX = 150Eh
BX = subfunction
00h get preference
DX = 0000h
Return: DX = preference settings
01h set preference
DH = volume descriptor preference
01h = primary volume descriptor
02h = supplementary volume descriptor
DL = supplementary volume descriptor preference
01h = shift-Kanji
CX = drive number (0=A:)
Return: CF set on error
AX = error code (15=invalid drive,1=invalid function)
CF clear if successful
--------d-2F150F-----------------------------
INT 2F - CD-ROM v2.00+ - GET DIRECTORY ENTRY
AX = 150Fh
CL = drive number (0=A:)
CH bit 0 = copy flag
clear if direct copy
set if copy to structure which removes ISO/High Sierra diffs
ES:BX -> ASCIZ path name
SI:DI -> buffer for directory entry (see #02628,#02629)
must be 255 bytes for direct copy, 285 bytes for canonical
Return: CF set on error
AX = error code
CF clear if successful
AX = disk format (0=High Sierra,1=ISO 9660)
Note: this function was not supported by Novell DOS 7 NWCDEX prior to the
08/16/94 update
Format of CD-ROM directory entry (direct copy):
Offset Size Description (Table 02628)
00h BYTE length of directory entry
01h BYTE length of XAR in Logical Block Numbers
02h DWORD LBN of data, Intel (little-endian) format
06h DWORD LBN of data, Motorola (big-endian) format
0Ah DWORD length of file, Intel format
0Eh DWORD length of file, Motorola format
---High Sierra---
12h 6 BYTEs date and time
18h BYTE bit flags
19h BYTE reserved
---ISO 9660---
12h 7 BYTEs date and time
(seventh byte is offset from GMT in 15-minute increments)
19h BYTE bit flags
---both formats---
1Ah BYTE interleave size
1Bh BYTE interleave skip factor
1Ch WORD volume set sequence number, Intel format
1Eh WORD volume set sequence number, Motorola format
20h BYTE length of file name
21h N BYTEs file name
BYTE (optional) padding if filename is odd length
N BYTEs system data
SeeAlso: #02629,#01352
Format of CD-ROM directory entry (canonicalized):
Offset Size Description (Table 02629)
00h BYTE length of XAR in Logical Block Numbers
01h DWORD Logical Block Number of file start
05h WORD size of disk in logical blocks
07h DWORD file length in bytes
0Bh 7 BYTEs date and time
12h BYTE bit flags
13h BYTE interleave size
14h BYTE interleave skip factor
15h WORD volume set sequence number
17h BYTE length of file name
18h 38 BYTEs ASCIZ filename
3Eh WORD file version number
40h BYTE number of bytes of system use data
41h 220 BYTEs system use data
SeeAlso: #02628
--------d-2F1510-----------------------------
INT 2F - CD-ROM v2.10+ - SEND DEVICE DRIVER REQUEST
AX = 1510h
CX = CD-ROM drive letter (0 = A, 1 = B, etc)
ES:BX -> CD-ROM device driver request header (see #02597 at AX=0802h)
Return: CF clear if device driver has been called (check the request header's
status word to determine whether an error has occurred)
ES:BX request header updated
CF set if device driver has not been called
AX = error code (000Fh = invalid drive, 0001h = invalid function)
ES:BX request header unchanged
Notes: MSCDEX initializes the device driver request header's subunit field
based on the drive number specified in CX
MSCDEX v2.21 through v2.25 (at least) return error code AX=0001h if
nested calls are attempted
BUGS: Novell DOS 7 NWCDEX prior to the 12/13/94 update did not initialize
the subunit field
Windows95 sets CF if CX isn't a CD-ROM drive but leaves CF unchanged
if the drive is in fact a CD-ROM
SeeAlso: AX=0802h
--------d-2F15FFBX0000-----------------------
INT 2F - CD-ROM - CORELCDX - INSTALLATION CHECK
AX = 15FFh
BX = 0000h
Return: BX = ABCDh if CORELCDX loaded
Note: Corel's CORELCDX.COM is a replacement for MSCDEX.EXE; it also supports
the standard MSCDEX installation check calls AX=1500h and AX=150Ch
SeeAlso: AX=1500h"CD-ROM",AX=150Ch
--------!---Section--------------------------