💾 Archived View for spam.works › mirrors › textfiles › computers › ASTRESEARCH › 0043.tb captured on 2023-11-14 at 13:32:04.
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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