;;  illustrates vesa svga programming
	;;  some info from www.vesa.org and
	;;  www.geocities.com/dos2dev/Video_1/video_1.htm
.model small
.486
.stack 100h
.data
winfunc	dd 0c0005ca3h
.code

	;;  set vga mod 11ah
	mov ax,4f02h		; VESA BIOS extension function
	mov bx,11ah		; select 1280x1024, 16-bit color mode
	int 10h
	mov di,0a000h
	mov es,di
	mov dx,0		;  window number

wind:	mov ax,4f05h		;  window offset select (bank select)
	mov bx,0
	push dx			
        int 10h
	pop dx
	;; 	call winfunc (doesn't work yet)
	
	xor di,di
	mov cx,0ffffh		; fill window
	mov ax,0f800h
lp0:	stosw
	loop lp0

	inc dx			; shift window (page) downards
	cmp dx,16
	jne wind

	mov ah,1		;  key delay
	int 21h
	mov ax,0003h
	int 10h			;  text mode
	mov ax,4c00h
	int 21h

end