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PC5086 compatibility fix (by Davide Bresolin) #3

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PC5086 compatibility fix (by Davide Bresolin) #3

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6b82b88
PC5086 compatibility fix.
davidebreso Mar 4, 2022
b14c827
Create README.md
davidebreso Nov 30, 2023
4cf98e6
Update README.md
davidebreso Nov 30, 2023
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39 changes: 9 additions & 30 deletions SOURCE/KEYB.PAS
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Original file line number Diff line number Diff line change
Expand Up @@ -1559,31 +1559,19 @@ end;
---- MODULE 7: XT specific routines -----
------------------------------------------------------------------------}


CONST
{ keyboard commands }
DisableKeyboard = $AD;
EnableKeyboard = $AE;

{************************************************************************
** EnableKeyboardProc: enable keyboard hardware **
** EnableKeyboardProc: clear keyboard buffer **
** ------------------------------------------------------------------- **
** IN: - **
** OUT: AX and CX are trashed **
** OUT: AL is trashed **
*************************************************************************}
Procedure EnableKeyboardProc; assembler;
label WaitReady2;
asm
XOR CX, CX { counter to 65535! }

WaitReady2:
IN AL, $64 { read status register }
TEST AL, 2 { bit 1 set: input buffer full? }
LOOPNZ WaitReady2 { loop until timeout or bit 1 clear }

MOV AL, EnableKeyboard
OUT $64, AL { send the enable command }

IN AL, $61 { read status register }
OR AL, $F0 { set bit 7, clear keyboard }
OUT $61, AL { clear keyboard }
AND AL, $7F { clear bit 7 }
OUT $61, AL { toggle clear bit to reenable keyboard }
end;


Expand Down Expand Up @@ -1620,15 +1608,6 @@ Start:
CLI { disable hardware ints }
XOR CX,CX
MOV ES,CX
DEC CX { counter to 65535! }

WaitReady1:
IN AL, $64 { read status register }
TEST AL, 2 { bit 1 set: input buffer full? }
LOOPNZ WaitReady1 { loop until timeout or bit 1 clear }

MOV AL, DisableKeyboard
OUT $64, AL { send the disable command }

{-- Read and authenticate scancode --}
IN AL, $60 { get scancode to AL }
Expand Down Expand Up @@ -1666,7 +1645,7 @@ EndProcessPause:
JMP LeaveInt

ChainToOld:
CALL EnableKeyboardProc
{ CALL EnableKeyboardProc -- not needed, OldInt9h will clear buffer }
PUSHF
STI
CALL DWORD PTR CS:[Offset OldInt9h]
Expand Down Expand Up @@ -2588,7 +2567,7 @@ begin
mov ah, $58 { set alloc strategy }
mov al, 1
xor bh,bh
mov bl, $81 { use last fit }
mov bl, $82 { last fit, try high then low }
int $21

mov ah, $58 { get UMB link state }
Expand Down