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CHIPSTEC.ASM
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Assembly Source File
|
1995-03-31
|
2KB
|
101 lines
;
; QPV/386 video driver
; for Chips & Technologies chipsets (82c45x, F655x0)
;
.286
Code Segment Para 'Code'
Assume cs:Code
Org 100h
Procs dw Bank,Init,Exit,0
Chipset db 0
; 0 = 82c451, 82c455, 82c456, 82c457
; 1 = 82c452
; 2 = 82c450, 82c453, F655x0
Bank: push ax
mov dl,Chipset
test dl,dl
jz Bank0
dec dl
jz Bank1
Bank2: mov dx,03d6h
shl ax,12
mov al,10h
out dx,ax
pop ax
retf
Bank1: mov dx,03d6h
shl ax,10
mov al,10h
out dx,ax
pop ax
retf
Bank0: mov dx,03d6h
mov ah,al
mov al,0bh
out dx,ax
pop ax
retf
Init: mov dx,46e8h
mov ax,001eh
out dx,ax ; enter setup mode
push dx
mov dx,0103h
mov al,80h
out dx,ax ; enable extended registers
pop dx
mov al,0eh
out dx,ax ; leave setup mode
mov dx,03d6h
mov al,04h
out dx,al
inc dx
in al,dx
or al,04h
out dx,al ; enable bank access & extended CRTC
dec dx
mov al,0bh
out dx,al
inc dx
in al,dx
and al,0fch
or al,01h
out dx,al ; enable extended paging & single page mode
dec dx
xor ax,ax
out dx,al
inc dx
in al,dx
shr al,4
jz ready ; 82c451 -> 0
dec al
jz ready1 ; 82c452 -> 1
dec al
jz ready ; 82c455 -> 0
cmp al,3
jb ready2 ; 82c453/0 -> 2
cmp al,5
jb ready ; 82c456/7 -> 0
; F655x0 -> 2
ready2: inc ah
ready1: inc ah
ready: mov cs:Chipset,ah
retf
Exit: retf
Code Ends
End Procs
; End of source.