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AST RESEARCH TECHNICAL BULLETIN TB-0043 8-20-84
PATCHING PC DOS 2.1 FOR ADDITIONAL DRIVES
When using SuperDrive, it may be necessary to set the motherboard
switch settings to indicate more floppy disk drives than one
really has. This may not be convenient for some, so a patch has
been developed for DOS. There is a different patch for each
version of PC-DOS. Since the patches for versions 1.10 and 2.00
of PC-DOS are documented in previous manuals dating from July
1983, only the patch for 2.10 of PC-DOS is included in this
bulletin.
Boot the computer with a DOS 2.10 diskette containing DEBUG.COM
A>DEBUG <Enter>
-L 100 0 D 1 For single-sided, 9-sector DOS diskette
or
-L100 0 B 1 For single-sided, 8-sector DOS diskette
or
-L100 0 10 1 For double-sided, 9-sector DOS diskette
or
-L100 0 E 1 For double-sided, 8 sector DOS diskette
-A 18A <Enter>
XOR SI, SI <Enter>
PUSH SI <Enter>
POP DS <Enter>
XOR BYTE PTR [410], XX <Enter>
PUSH CS <Enter>
PUSH CS <Enter>
POP DS <Enter>
POP ES <Enter>
MOV WORD PTR [SI], 798 <Enter>
POP AX <Enter>
MOV AL, YY <Enter>
NOP <Enter>
"NO RESPONSE" <Enter>
-W100 0 D 1 <Enter> For single-sided, 9-sector DOS diskette
or
-W100 0 B 1 <Enter> For single-sided, 8-sector DOS diskette
or
-W100 0 10 1 <Enter> For double-sided, 9-sector DOS diskette
-W100 0 E 1 <Enter> For double-sided, 8-sector DOS diskette
-Q
A><Ctrl-Alt-Del>
SWITCHES SET FOR SWITCHES SET FOR
ONE DRIVE TWO DRIVES
xx=40 2 drives xx=C0 3 drives
xx=80 3 drives xx=80 4 drives
xx=C0 4 drives
yy=02 2 drives yy=03 3 drives
yy=03 3 drives yy=04 4 drives
yy=04 4 drives