Path: utzoo!news-server.csri.toronto.edu!rutgers!usc!rpi!crdgw1!uunet!mcsun!corton!chorus!opera.chorus.fr!mir
From: mir@opera.chorus.fr (Adam Mirowski)
Newsgroups: comp.sys.ibm.pc.misc
Subject: Re: PGA compatibility.
Message-ID: <8309@chorus.fr>
Date: 11 Mar 91 14:54:15 GMT
References: <9103091404.AA02310@mani.kaist.ac.kr>
Sender: mir@chorus.fr
Reply-To: mir@opera.chorus.fr (Adam Mirowski)
Organization: Chorus systemes, Saint Quentin en Yvelines, France
Lines: 18

In article <9103091404.AA02310@mani.kaist.ac.kr>, uhhyung@MANI.KAIST.AC.KR (Uhhyung Choi) writes:
%% 	I have some questions on PGA Compatibilities.
%% 	IS PGA COMPATIBLE WITH CGA OR EGA?
%% 	Any comments on this will be helpful.

IBM PGA was compatible with CGA only. Matrox had a PGA compatible board
that had a better text-mode CGA emulation (twice vertical resolution).

However, the compatibility is a bit peculiar: CGA screen can coexist
with the PGA screen, and you switch the display with a simple I/O
operation. Just as if you had two cards connected to a single display
through a switch.

Matrox CGA emulation wasn't very good in graphics mode. Microsoft Word
had problems with it.
-- 
Adam Mirowski,  mir@chorus.fr (FRANCE),  tel. +33 (1) 30-64-82-00 or 74
Chorus systemes, 6, av.Gustave Eiffel, 78182 Saint-Quentin-en-Yvelines CEDEX