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Shareware Grab Bag
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011
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fixser.arc
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FIXSER.DOC
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1986-12-14
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2KB
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35 lines
This is a program to allow the SPERRY PC/IT to recognize internal modems and
ASYNC ports not recognized by the PC. It will set the equipment table to
indicate that the system has two serial ports installed at the standard COM1
and COM2 addresses. The internal async port corresponding to the installed
device must be disabled as described in the system installation guide.
The following is a listing of the FIXSER.COM program included:
MOV AX,0040 ; seg adrs of equipment table
MOV DS,AX ; to DS reg
MOV AX,03F8 ; adrs of COM1
MOV [0000],AX ; to 0040:0000 (equip table)
MOV AX,02F8 ; adrs of COM2
MOV [0002],AX ; to 0040:0002 (equip table)
MOV AL,[0011] ; byte containing number of com ports installed
AND AL,FD ; set bit 1 to zero
OR AL,04 ; and bit 2 to one
MOV [0011],AL ; put back into equip table 0040:0011
RET ; done
I hope this patch will help anyone with a SPERRY IT who has trouble with an
internal modem as I did. I include FIXSER.COM in my AUTOEXEC.BAT file.
Not all software will have problems without the patch (CROSSTALK works fine),
but any program that checks the equipment table will not find certain add on
async devices without the patch.
The fix was provided to me by SPERRY customer engineering.
Jeremy S. Nichols 11/15/86
You can find Jeremy and other top-notch programmers and techies
at Terrapin Station BBS -- 2400/1200 - 24 hours a day
612/623-0152 -- a BBS for programmers!
Additional lines available for subscribers.