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AHEAD.ASM
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Assembly Source File
|
1994-07-02
|
1KB
|
65 lines
;
; QPEG video driver
; for VGA graphics cards based on Ahead chipsets.
; Should work with both Ahead A and B versions.
;
.286
Code Segment Para 'Code'
Assume cs:Code
Org 100h
Procs dw Bank,Init,Exit,0
AorB db 1 ; 0=A, 1=B
Bank: push ax
mov dx,03ceh
mov ax,200fh
out dx,ax
pop ax
push ax
test cs:AorB,0fh
jz AheadA
AheadB: mov ah,al
shl ah,4
or ah,al
mov al,0dh
out dx,ax
pop ax
retf
AheadA: push bx
mov bl,al
shl ax,7
mov al,0dh
out dx,ax
mov dl,0cch
in al,dx
mov dl,0c2h
and al,11011111b
and bl,01h
shl bl,5
or al,bl
out dx,al
pop bx
pop ax
retf
Init: mov dx,03ceh
mov ax,200fh
out dx,ax
inc dx
in al,dx
and al,0fh
mov cs:AorB,al
retf
Exit: retf
Code Ends
End Procs
; End of source.