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From: thompsa1597@iscsvax.uni.edu
Newsgroups: comp.sys.apple2
Subject: Re: Language Card access -- do $C08x switches work on IIGS?
Message-ID: <1993Jun7.004328.13550@iscsvax.uni.edu>
Date: 7 Jun 93 00:43:28 -0600
References: <XHaa5B1w165w@sms.business.uwo.ca>
Organization: University of Northern Iowa
Lines: 225
FIre up your copy buffers. This should answer your question about the
soft switches. Four pages of goodies no Appler should be without:
SOFT SWITCHES
+--------+---------------+---------+---------+-----+
| ACTION | ADDRESS | READ | WRITE? | $D0 |
+--------+---------------+---------+---------+-----+
| R | $C080 / 49280 | RAM | NO | 2 |
| RR | $C081 / 49281 | ROM | YES | 2 |
|de R | $C082 / 49282 | ROM | NO | 2 |
| RR | $C083 / 49283 | RAM | YES | 2 |
| R | $C088 / 49288 | RAM | NO | 1 |
| RR | $C089 / 49289 | ROM | YES | 1 |
| R | $C08A / 49290 | ROM | NO | 1 |
| RR | $C08B / 49291 | RAM | YES | 1 |
+--------+---------------+---------+---------+-----+
|de W | $C008 / 49160 | MAIN ZPAGE,STACK,LC |
| W | $C009 / 49161 | AUX. ZPAGE,STACK,LC |
+--------+---------------+-------------------------+
| R7 | $C011 / 49169 | $D0 BANK 2(1) OR 1(0) |
| R7 | $C012 / 49170 | READ RAM(1) OR ROM(0) |
| R7 | $C016 / 49174 | USE AUX(1) OR MAIN(0) |
+--------+---------------+-------------------------+
|de W | $C002 / 49154 | READ FROM MAIN 48K |
| W | $C003 / 49155 | READ FROM AUX. 48K |
|de W | $C004 / 49156 | WRITE TO MAIN 48K |
| W | $C005 / 49157 | WRITE TO AUX. 48K |
| R7 | $C013 / 49171 | RDG MN (0) OR AX (1) |
| R7 | $C014 / 49172 | WRT MN (0) OR AX (1) |
+--------+---------------+-------------------------+
|de W | $C000 / 49152 | RD/WR MAIN $40-5F |
| W | $C001 / 49153 | RD/WR AUX. $40.5F |
| R | $C054 / 49236 | VIEW PG 1 |
| R | $C055 / 49237 | VIEW PG 2 |
| R | $C056 / 49238 | VIEW TEXT & LO-RES |
| R | $C057 / 49239 | VIEW HI-RES |
+--------+---------------+-------------------------+
|? R7 | $C018 / 49176 | 80STORE ON(1) OR OFF(0) |
| R7 | $C01C / 49180 | VEIW PAGE 2(1) OR 1(0) |
+--------+---------------+-------------------------+
| W | $C07E / 49278 | ENABLE DHIRES |
|de W | $C07F / 49279 | DISABLE DHIRES |
| R/W | $C05E / 49246 | DHIRES ON |
|de R/W | $C05F / 49247 | DHIRES OFF |
| R7 | $C07E / 49278 | DHRS ENABLED 1=Y 0=N |
| R7 | $C07F / 49279 | DHIRES ON(1) OR OFF(0) |
+--------+---------------+-------------------------+
| W | $C00C / 49164 | 40 COLUMN |
| W | $C00D / 49165 | 80 COLUMN |
+--------+---------------+-------------------------+
| R7 | $C01F / 49183 | VIEWING 40(0) OR 80(1) |
+--------+---------------+-------------------------+
| R7 | $C068 / 49256 | 80/40 DOWN(1) OR UP(0) |
| W | $C073 / 49267 | RAM BANK (0-15) |
+--------+---------------+-------------------------+
HARDWARE LOCATIONS
+-------+-------+---------------------------+
| DEC | HEX | USE |
+-------+-------+---------------------------+
| 49280 | $C080 | PHASE 0 OFF |
| 49281 | $C081 | PHASE 0 ON |
| 49282 | $C082 | PHASE 1 OFF |
| 49283 | $C083 | PHASE 1 ON |
| 49284 | $C084 | PHASE 2 OFF |
| 49285 | $C085 | PHASE 2 ON |
| 49286 | $C086 | PHASE 3 OFF |
| 49287 | $C087 | PHASE 3 ON |
| 49288 | $C088 | MOTOR OFF |
| 49289 | $C089 | MOTOR ON |
| 49290 | $C08A | DRIVE 1 |
| 49291 | $C08B | DRIVE 2 |
| 49292 | $C08C | READ LATCH OR WRITE+SHIFT |
| 49293 | $C08D | WRITE+LOAD OR PROTECT CHK |
| 49294 | $C08E | READ LATCH OR PROTECT CHK |
| 49295 | $C08F | WRITE+LOAD OR WRITE+SHIFT |
+-------+-------+---------------------------+
I/O FUNCTIONS
+-------------+-------------+-------------+
| READ | WRITE | PROTECTED? |
+-------------+-------------+-------------+
| LDA $C08E,X | LDA $C08F,X | |
| ... | ... | |
| ... | LDA DATA | LDA $C08D,X |
| LDA $C08C,X | STA $C08D,X | LDA $C08E,X |
| BPL -1 | ORA $C08C,X | BMI PROTECT |
+-------------+-------------+-------------+
SKEWING
DOS : 0 1 2 3 4 5 6 7 8 9 A B C D E F
PRODOS: 0A 7A 6B 6A 5B 5A 4B 4A 3B 3A 2B 2A 1B 1A 0B 7B
DISK : 0 D B 9 7 5 3 1 E C A 8 6 4 2 F
SIZES
PRO+VOL+TRK+SEC+CSM+EPG = 3+2+2+2+2+3 = 14 ($0E)
PRO+BYTES+CSM+EPG = 3+342+2+3 = 350 ($015E)
4 & 4 encoding = SEC, ROL 1st, AND with 2nd
300 baud = 3.33 bks/min
1200 baud = 13.33 bks/min
2400 baud = 26.50 bks/min
DISK DRIVE ADDRESSES
+---------------------------------------------------------+
| ADDRESS FIELD |
| +-----------------------+-----------------------+ |
| | PROLOGUE | EPILOGUE | |
| +-------+-------+-------+-------+-------+-------+ |
| |$D5/213|$AA/170|$96/150|$DE/222|$AA/170|$EB/235| |
+----+-------+-------+-------+-------+-------+-------+----+
| RD | 47445 | 47455 | 47466 | 47505 | 47515 | - - - | RD |
| | $B955 | $B95F | $B96A | $B991 | $B99B | - - - | |
+----+-------+-------+-------+-------+-------+-------+----+
| WR | 48250 | 48255 | 48260 | 48302 | 48307 | 48312 | WR |
| | $BC7A | $BC7F | $BC84 | $BCAE | $BCB3 | $BCB8 | |
+----+-------+-------+-------+-------+-------+-------+----+
Read checksum at $B989: D0 B7 (47497 = 208,183)
+---------------------------------------------------------+
| DATA FIELD |
| +-----------------------+-----------------------+ |
| | PROLOGUE | EPILOGUE | |
| +-------+-------+-------+-------+-------+-------+ |
| |$D5/213|$AA/170|$AD/173|$DE/222|$AA/170|$EB/235| |
+----+-------+-------+-------+-------+-------+-------+----+
| RD | 47335 | 47345 | 47356 | 47413 | 47423 | - - - | RD |
| | $B8E7 | $B8F1 | $B8FC | $B935 | $B93F | - - - | |
+----+-------+-------+-------+-------+-------+-------+----+
| WR | 47187 | 47192 | 47197 | 47262 | 47267 | 47272 | WR |
| | $B853 | $B858 | $B85D | $B89E | $B8A3 | $B8A8 | |
+----+-------+-------+-------+-------+-------+-------+----+
Read checksum at $B92D: D0 13 (47405 = 208,19)
RWTS LOCATIONS
$B7E9 / 47081 = SLOT * 16
$B7EA / 47082 = DRIVE
$B7EB / 47083 = ZERO
$B7EC / 47084 = TRACK
$B7ED / 47085 = SECTOR
$B7F0 / 47088 = BUFFER LO
$B7F1 / 47089 = BUFFER HI
$B7F3 / 47091 = ZERO
$B7F4 / 47092 = SEEK/READ/WRITE
$03E3 / NA = LOAD X/Y WITH PARM LIST ADDRESS
$03D9 / NA = CALL RWTS (MUST CALL ABOVE FIRST)
$B793 / 46995 = SEEK/READ/WRITE MULTIPLE PAGES
$B7E1 / 47073 = NUMBER OF PAGES
ROM SUBROUTINES
BASCLCTX $FBC1
IP Ar = vtab - 1
OP $28.29 = base location htab 1
HOME $FC58
CHAROUT $FDF0
IP Ar = a character
OP print Ar at ($28)+$36
READKEY $FD0C
OP character in Ar
PRINTHEX $FDE3
IP Ar = a number 00-0F
OP Ar printed as a number, form $A
PRBYTE $FDDA
IP Ar = a number
OP Ar printed as a number, form $AA
PRINTAX $F941
IP Ar & Xr = a number
OP Ar & Xr printed as a number, form $AAXX
TEXT $FB2F
BASCLCHI $F411
IP Ar, Xr, Yr = hires location, form YYXX,AA
OP ($26) = base address
CLRHIRES $F3F6
IP $E6 = page, $1C = hcolor
OP hires screen cleared to given color
HPLOT $F457
IP $E4 = hcolor, HPOSN called
OP point plotted
PRNMZERO $FE93
NORMAL $FE84
OP $32: FF
WAIT $FCA8
IP Ar = length of pause
OP returns after relative pause
CHKCOMMA $DEBE
IP command line = char
OP syntax error if not a comma
GETHIRES $F6B9
IP command line = hires location
OP location in form YYXX,AA, or ill. quant.
GETCHAR $00B1
IP command line = char or token
OP char/token in Ar
GETSMNUM $E6F8
IP command line = number
OP Xr = number 00-FF
GETBGNM $DD67 + $E752
IP command line = number
OP $50.51 = number 0000-FFFF
ILLQUAN $F6E6
SNTXERR $DEC9
PRTAREG $FE95
IP: number in Areg
op: number printed
RDPADDL $FB1E
IP: Xreg = paddle #
OP: xreg = pdl(x)
A note of care: CLRHIRES has been found to ERASE parts of ProDOS if you
don't make sure to set the hires page at $E6. (found this one out the