From: Shawn Hargreaves <Shawn AT talula DOT demon DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: looking for xmode 640x400x256
Date: Thu, 6 Mar 1997 19:00:36 +0000
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votava christian writes:
>do you know wherre I can get nice docs for xmode 640x400x256
>in french if it is possible ?

This is described in the PCGPE (which can be found on x2ftp.oulu.fi) in
the file xtended.txt. There's also some code for setting it in my
Allegro library (look at the function xtended_init(), in modex.c).

You should be aware, though, that it is a non-standard resolution, and
doesn't work on every graphics card. It depends on the presence of a
VESA driver that can set the 640x400 mode (which some cards, eg. early
S3 chipsets, don't support), and assumes that the card will emulate the
VGA plane registers and chain-4 flag despite the fact that it is in an
SVGA resolution (this isn't true on my Matrox Mystique).

If you want 100% solid code that will run on any machine, you'd be much
better off using standard VESA functions in 640x480 mode.


/*
 *  Shawn Hargreaves - shawn AT talula DOT demon DOT co DOT uk - http://www.talula.demon.co.uk/
 *  Beauty is a French phonetic corruption of a short cloth neck ornament.
 */