*BSD News Article 79089


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From: Zach Heilig <zach@blizzard.gaffaneys.com>
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Simutaneous mono and vga under FreeBSD...
Date: 25 Sep 1996 01:34:08 -0500
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Ken Bigelow <kbigelow@www.play-hookey.com> writes:

> The concept is indeed correct. I can only conclude that the combinations
> I was using at the time, for whatever reason, would not support this
> mode of operation. Whether it was the video card, the ROM BIOS, the
> support chipset, or whatever, I can't say now. All I can report is that
> all such attempts resulted in disaster on two displays as soon as I went
> into a VGA graphics mode. So, I gave it up as hopeless (which it was at
> the time).

There is (was) a problem with using an 16-bit vga card with a mono
card, because the way cards decide which addresses they own.  The VGA
would claim the B??? segment as it's own (and later, when it found out
the ??? was not >=800, ignore the request sent to it).  This is one of
the ways that the mono and VGA cards conflicted, even though they
didn't have to.

-- 
Zach Heilig (zach@blizzard.gaffaneys.com) | ALL unsolicited commercial email
Support bacteria -- it's the              | is unwelcome.  I avoid dealing
only culture some people have!            | with companies that email ads.