From: "sl" <junk AT bbs DOT darktech DOT org>
Newsgroups: comp.os.msdos.djgpp
Subject: VBE 1.2 -- question
Date: Tue, 04 Jan 2000 23:41:46 -0500 (EST)
Organization: Posted via Supernews, http://www.supernews.com
Lines: 17
Message-ID: <fyoofqnexgrpubet.fnuidm0.pminews@nntp.generation.net>
X-Complaints-To: newsabuse AT supernews DOT com
X-Newsreader: PMINews 2.00.1205 For OS/2
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi,

	I was wondering how video-page scrolling and flipping works. I mean,
I know what these two functions are used for, but I was wondering how the
memory used for multiple pages is actually mapped. Lets say I wanted to write
to page 2 (assuming page 1 is the visible page), would I simply write into
the memory directly following page 1? What happens if I wanted to
write/plot-pixels into an area of the virtual scanline which is not visible?
Where would I write to then? I'm basically asking about the memory model
being used to support these two features so I can add support for them in my
video library.

Thanks,

Gili