From:	tom burgess <tburgess AT drao DOT nrc DOT ca>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Allegro Problems
Date:	Sat, 06 Sep 1997 23:43:22 -0700
Organization:	BCTEL Advanced Communications
Lines:	14
Message-ID:	<34124D0A.D8B@drao.nrc.ca>
References:	<3411E944 DOT 52E6 AT voyageur DOT ca>
NNTP-Posting-Host:	pntn02m02-72.bctel.ca
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

J.E. wrote:
> 
> Hello.  I just downloaded Allegro v2.2, but I am having some serious
> problems with the screen scrolling function.  I wrote this code to test
> the scrolling (something new to me):
> 
<deleted>

It might be useful to check that set_gfx_mode() is not returning
a negative number (for failure). Zero indicates success.
I think it can fail if the video card does not have enough RAM
or doesn't support hardware scrolling.

	regards, tom.

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