From:	"Chris A. Triebel" <cat AT sun4 DOT iol DOT unh DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Assembly Question
Date:	Mon, 7 Oct 1996 15:47:51 -0400
Organization:	University of New Hampshire - Durham, NH
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References:	<EmJc4JO00bk10tCco0 AT andrew DOT cmu DOT edu>
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On Sat, 5 Oct 1996, John David Doty wrote:

> Date: Sat, 5 OCT 1996 11:39:01 -0400 
> From: John David Doty <doty+@andrew.cmu.edu>
> Newgroups: comp.os.msdos.djgpp
> Subject: Assembly Question 
> 
> This may be a really silly question, but...
> 
> How do I get to the VGA memory in assembly?  No C- straight assembly via
> as.  All of the examples that I've seen involve using C for at least
> part of the setup.
> 
> Thanks in advance,
> John
> 
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> John Doty                      |"We can fly- We have wings...
> Anime Fan, Programmer-at-large | We can touch floating dreams...."-Macross +
> doty AT andrew DOT cmu DOT edu            |"The deepness of one's sorrow upon parting
> http://bifrost.res.cmu.edu/    | is the evidence of the deepness of one's
>      |         v        @      | love, so... if one fears sadness, one
>     ^_^       ^_^      ^_^     | wouldn't be able to love anything."
>   Belldandy   Urd     Skuld    |       -Belldandy, "Don't fear sorrow"
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> ======================  --==(UDIC)==--  Keiichi Dragon  =====================
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> 
> 
> 


mov ah,00h	; bios int 10h video mode select function
mov al,13h	;  the mode number ( 320x200x256 )
int 10h

mov si,0A000h	; set the es:di ptr to 0A000:0000 <- the start of VGA memory
mov es,si
mov si,0

mov cx,64000	; 320x200
mov al,0Fh	; set the color white
rep stosb	; store to every pixel on screen

mov ah,00h	; restore the video mode
mov al,03h
int 10h

NOTE:  The important address to remember is 0A000:0000 the start of video 
memory for page 0.  This is really enough to program for video, but it is 
a start.  If you would like more information let me know.

cat
-------------------------------------------------------------------------------
"It's not the programming languages that will kill you, its the syntax."
"Digging a hole with a bulldozer is much more effective, unless you only know
how to use a shovel."

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