*BSD News Article 78183


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From: Ken Bigelow <kbigelow@www.play-hookey.com>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Simutaneous mono and vga under FreeBSD...
Date: Thu, 12 Sep 1996 19:23:22 +0000
Organization: Erol's Internet Services
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Message-ID: <3238632A.6516@www.play-hookey.com>
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To: chaos@wsg.net

The Lord of Chaos wrote:
> 
> Hello all!
> 
> I was just wondering if anybody knows if it would be possible to set up
> a FreeBSD 2.1.5-Release machine with simultaneous monochrome and vga
> output.  I have an old Hercules mono card that I would like to use for
> console output.  Then I'd like to use the cheap trident card I have to
> run X in vga mode.  Is it possible to do this simultaneously?  If you
> have any ideas/suggestions/comments please e-mail me.
> 
> If you know of a place where I could find documentation on doing this
> I'd greatly appreciate it.  I checked the handbook but the area on video
> is empty.
> 
> Thanks for your time!!
> 

Hang that one up -- it won't fly.

It is possible to run monochrome and CGA cards simultaneously, because
their address spaces don't overlap. However, VGA graphics modes will
overlap both mono and CGA space (segments B000 and B800, respectively).
Higher-density graphics modes slide into A000 as well. Newer cards with
even higher density use other techniques to exceed 128k of addressable
video RAM, but you still can't use the Hercules card at the same time.
-- 
Ken

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