mirror of
https://github.com/vxunderground/MalwareSourceCode.git
synced 2024-12-19 01:46:09 +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
|
|||
|
|
|