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Shareware Overload Trio 2
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Shareware Overload Trio Volume 2 (Chestnut CD-ROM).ISO
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psi110g.zip
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VIDEO.ASM
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Assembly Source File
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1993-09-16
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1KB
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45 lines
; .MODEL LARGE,C
include asmglobal.h
.CODE
public gettype
;
; int gettype( int * );
; returns the adapter type (1=VGA, 0=other) and number of displayed rows
;
gettype PROC USES SI DI, rows:PTR
mov ax,40h
mov es,ax ; ES -> video BIOS data area
mov al,es:[84h] ; ROWS
xor ah,ah
inc ax
mov bx,rows
mov [bx],ax ; number of displayed rows
; the following function is supported only by the VGA
mov ax,1200h
mov bl,36h
int 10h ; enable screen refresh
cmp al,12h
xor ax,ax ; assume not VGA
jne return ; jump if not supported
mov ax,500h
int 10h ; select display page 0
; Select the alternate print-screen routine that works properly if the number
; of displayed rows is not 25.
mov ah,12h
mov bl,20h
int 10h ; select alternate print-screen
mov ax,1 ; is VGA
return: ret
gettype ENDP
END