Re: 2 monitors w/BC++3.0 ?'s

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#386

From: Peter Haller
Date: Wed, 15 Apr 1992 05:03

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In a previous article, IO20081@MAINE.MAINE.EDU (robert eric beckwith) says:


>---------------------------------------------------------
>Using BC++ can I use the on board video driver vga
>to drive a debugging monitor and use the xga for
>display of the program?? (I want to know if this will
>work before purchasing the video card and another monitor)
>or any suggestions???
>----------------------------------------------------------
If the built in VGA uses 0xC0000-0xC7FFF in the first 640K
you can't. (It most likely does.) The normal second monitor
is a monichrome (MDA). This is because a mono graphics card
uses memory from 0xB0000-0xBFFFF (I think). When your VGA card
boots it recognizes that there is a secondardy display and
since the adresses don't conflict, everything is fine. If
you try to use a card that needs the same area of memory
as the built in VGA, you have a probelm. Only one display
can be used - period - that uses this address range. (I'm
not up on XGA or a 'real' 8514/a adaptor. Maybe these can
be set to map elsewhere or your on board VGA can, but this
is unlikely.)

PCH

-- 
Peter C. Haller				|	'If you do what you 
Imagination Processing Systems		|	have always done,
aa596@cleveland.Freenet.Edu 		|	expect what you have
"Are we having fun yet?"		|	always recieved.'

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From: aa596@cleveland.Freenet.Edu (Peter Haller)
Subject: Re: 2 monitors w/BC++3.0 ?'s
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Date: Wed, 15 Apr 92 05:03:49 GMT
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