From:	"Campbell, Rolf [SKY:1U32:EXCH]" <moscoop AT americasm01 DOT nt DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Allegro Bug
Date:	Fri, 31 Mar 2000 14:16:12 -0500
Organization:	Nortel Networks
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Robin Johnson wrote:

> Hi all,
>
> I found a bug in Allegro, that seems to be restricted to S3 graphics cards,
> namely after switching back to Windows from the app, the screen refuses to
> refresh. I have narrowed the bug down to the gfx card, because I had two
> absolutly identical systems, bar the difference in the gfx cards, one with the
> S3, and the other with an ATI card. The systems are completly identical on the
> installed software level, by use of drive imaging software.
>
> Anybody else had the same bug? Or any know any fixes?

This does not sound like a bug in Allegro.  It sounds like a bug in your Windows
video drivers.  I've seen various similar problems because most companies are too
lazy (or feel it's not economically worth-while) to properly impliment support
for SVGA dos programs, or even some non-svga ones.
Some ATI cards (tested under Win95b) cannot use the BIOS's video mode restore
function to restore from 94xX to 80x33 (it crashes the DosBox).

--
(\/) Rolf Campbell (\/)

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