mirror of
https://github.com/vxunderground/MalwareSourceCode
synced 2024-06-28 09:52:32 +00:00
55 lines
1.4 KiB
NASM
55 lines
1.4 KiB
NASM
TITLE scrn4.asm
|
||
|
||
; AUTHOR Tim Spencer - Compuserve [73657,1400]
|
||
; DATE March 19, 1987
|
||
|
||
_TEXT SEGMENT BYTE PUBLIC 'CODE'
|
||
_TEXT ENDS
|
||
|
||
_DATA SEGMENT WORD PUBLIC 'DATA'
|
||
_DATA ENDS
|
||
|
||
DGROUP GROUP _DATA
|
||
ASSUME CS:_TEXT, DS:DGROUP, SS:DGROUP, ES:NOTHING
|
||
|
||
|
||
_TEXT SEGMENT BYTE PUBLIC 'CODE'
|
||
|
||
;-----------------------------------------------------------------------;
|
||
; vcard_type - Tests for type of video card in use ;
|
||
; ;
|
||
; Returns: 0 = MONOCHROME ADAPTER ;
|
||
; 1 = COLOR GRAPHICS ADAPTER ;
|
||
; 2 = ENHANCED GRAPHICS ADAPTER ;
|
||
;-----------------------------------------------------------------------;
|
||
|
||
PUBLIC _vcard_type
|
||
|
||
_vcard_type PROC NEAR
|
||
push es
|
||
mov ax,40h ; point es to BIOS area
|
||
mov es,ax
|
||
mov al,es:[87h] ; is there an EGA card?
|
||
cmp al,0
|
||
je mono_test ; no ega, check for mono
|
||
test al,00001000b ; test bit 3
|
||
jnz mono_test ; bit 3 was set - ega not active card
|
||
mov ax,2 ; ega is in use...return a 2
|
||
jmp short exit
|
||
mono_test:
|
||
mov al,es:[10h] ; get video status byte
|
||
and al,00110000b ; isolate bits 4 and 5
|
||
cmp al,48 ; is it a mono card?
|
||
jne assume_cga ; no, assume it's a cga
|
||
mov ax,0 ; return 0 for mono card
|
||
jmp short exit
|
||
assume_cga:
|
||
mov ax,1 ; return a 1 for cga card
|
||
exit: pop es
|
||
ret
|
||
_vcard_type ENDP
|
||
|
||
_TEXT ENDS
|
||
|
||
END
|
||
|