Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!usc!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!cica!news.cs.indiana.edu!ux1.cso.uiuc.edu!ux1.cso.uiuc.edu!m.cs.uiuc.edu!sunb2!kulas
From: kulas@sunb2.cs.uiuc.edu
Newsgroups: comp.graphics
Subject: Re: VGA register programming
Message-ID: <23900021@sunb2>
Date: 7 Nov 90 16:43:00 GMT
References: <2074@greek.csd.mot.com>
Lines: 18
Nf-ID: #R:greek.csd.mot.com:2074:sunb2:23900021:000:950
Nf-From: sunb2.cs.uiuc.edu!kulas    Nov  7 10:43:00 1990


You might have a look at Michael Abrash's book.  I forget the title.  Abrash
is the guy who writes the great PC graphics articles for Programmer's Journal.
The book is a collection of those articles.  If you pick up a recent copy of
Programmer's Journal, there is sure to be an advertisement for the book (full
page, if I recall).

A couple of his articles discuss graphics modes available on the standard VGA
which support double buffering.  You can double buffer 640x350x4(bit planes) on
an EGA (and so, of course, on the VGA).  I don't think you can double buffer
640x480x4 on the VGA due to the way memory would have to be organized.  Abrash
discusses some interesting modes, not supported by the BIOS, but available on a
vanilla VGA, which may be double buffered.  One of these is 320x400x8.

I would imagine at least one of his articles goes into depth on the kind of VGA
registers you're interested in, though I can't remember offhand.

Mike