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From: brown@vidiot.UUCP (Vidiot)
Newsgroups: comp.sys.ibm.pc
Subject: Re: USING TWO GRAPHICS CARDS IN A COMPAQ 386/25
Keywords: VGA CGA COMPAQ 386 GRAPHICS
Message-ID: <354@vidiot.UUCP>
Date: 23 Dec 89 17:56:52 GMT
References: <5209@arctic.nprdc.arpa>
Reply-To: brown@vidiot.UUCP (Vidiot)
Distribution: na
Organization: Vidiot's Hangout
Lines: 24

In article <5209@arctic.nprdc.arpa> trejo@nprdc.arpa (Leonard J. Trejo) writes:
<
<We're trying to use two graphics cards in a Compaq 386/25 computer
<running MS-DOS 3.1.  One card is the Compaq Video Graphics Controller
<(VGA-compatible) and the other is the Compaq Video Display Controller
<(CGA-compatible).  We'd like to use, simultaneously, the VGA for 
<graphics-only display purposes only and the CGA as a text-only 
<console which echoes keyboard input.  Problem is that despite our 
<best efforts, graphics always go to the CGA card.  I'm told that 
<this is because VGA and CGA screen memory overlap, plus that 
<whenever another graphics card is installed with the Compaq VGA, 
<graphics are forced to go to the other card and the VGA runs in 
<monochrome mode.

You have been told correctly.  You can only run a monochrome and a color card
in the same system.  Both the VGA and CGA use the same memory mapped space and
control registers (CGA is a sub-set of VGA cards).

You are SOL.
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