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From: tom@uw-warp.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Re: Silly EGA question, but...
Message-ID: <651@uw-warp.UUCP>
Date: Mon, 26-Jan-87 17:33:53 EST
Article-I.D.: uw-warp.651
Posted: Mon Jan 26 17:33:53 1987
Date-Received: Wed, 28-Jan-87 07:31:51 EST
References: <4602@watmath.UUCP>
Organization: The Warp, Seattle, WA
Lines: 22
Summary: I used INT 10h to access the EGA

In article <4602@watmath.UUCP>, daemon@watmath.UUCP writes:
> Using C or assembler or generic language other than BASIC
> I cant find in my limited documentation just HOW EXACTLY does one
> write/make graphics/colours on an AT EGA console. (dos3.x)
> BASIC has its keywords for doing graphics things, but how do generic
> programs do things the hard way?
> 
>           - Ken Dykes
>             Software Development Group, U. of Waterloo
>             Waterloo, Ontario, Canada.  N2L 3G1  (+1 519) 885 1211
>             uucp:    {ihnp4,decvax,allegra,utzoo}!watmath!watbun!kgdykes
>             bitnet:  kgdykes@water
>             kgdykes%watbun@waterloo.csnet
>             kgdykes%watbun%waterloo.csnet@csnet-relay.arpa

I used the video interrupt, INT 10h, to write pixels on the EGA from assembly
language.  The same thing could also be done from C.  That was a lot easier
than trying to understand how to access the hardware directly.  INT 10h is
documented in the DOS Technical Reference Manual.  You also have to use
INT 10h to get the card into the correct mode.  I think you get some
documentation with it that tells about the modes, otherwise you'll have to
resort to trial and error.-- 
Tom May.	uw-beaver!uw-nsr!uw-warp!tom