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