Category : Files from Magazines
Archive   : PCTJ1188.ZIP
Filename : GETCRTCR.ASM
;
; unsigned char GetCRTCReg( n );
; unsigned char n; /* register number */
;
_TEXT SEGMENT byte public 'CODE'
ASSUME cs:_TEXT
PUBLIC _GetCRTCReg
_GetCRTCReg PROC near
push bp
mov bp,sp
mov ax,40h ; get I/O port for CRTC index reg
mov es,ax ; from ROM BIOS data area
mov dx,es:[63h]
mov al,[bp+4] ; AL = register number
cli ; clear interrupts
out dx,al ; write to CRTC index reg
jmp $+2
inc dx ; DX = I/O port for CRTC data reg
in al,dx ; AL = register value
sti ; enable interrupts
xor ah,ah ; AX = return value
pop bp
ret
_GetCRTCReg ENDP
_TEXT ENDS
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