From:	Shawn Hargreaves <Shawn AT talula DOT demon DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Allegro problem
Date:	Mon, 2 Jun 1997 19:56:40 +0100
Organization:	None
Distribution:	world
Message-ID:	<MkTAdHAodxkzEwn5@talula.demon.co.uk>
References:	<33917F55 DOT E654C66D AT impsat1 DOT com DOT ar>
NNTP-Posting-Host:	talula.demon.co.uk
MIME-Version:	1.0
Lines:	18
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

>It's pretty simple, when I run the demo in 640x480 page flipping, the
>lower half of the screen appears twice . So you never see the upper half
>of the screen.

What graphics driver is this using? (run the test.exe program in 640x480
autodetect mode, it will display the driver name and description in the
middle of the screen). Also, could you check the scrolling function in
test.exe, and see if you can figure out exactly how it is going wrong?
At a guess, you'll find that it is out by a power of two (either
scrolling right and left by two pixels every time you press an arrow
key, or only scrolling on every other keypress). If you could let me
know which way the error is, and which driver it is using, that would
help a lot...


--
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.

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