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Date:      Fri, 23 Oct 1998 08:53:39 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Jason Thorpe <thorpej@nas.nasa.gov>, Nick Hibma <nick.hibma@jrc.it>
Cc:        Mike Smith <mike@smith.net.au>, FreeBSD hackers mailing list <hackers@FreeBSD.ORG>
Subject:   Re: multi-user: multiple consoles in FreeBSD
Message-ID:  <19981023085339.H28824@freebie.lemis.com>
In-Reply-To: <199810221628.JAA06206@lestat.nas.nasa.gov>; from Jason Thorpe on Thu, Oct 22, 1998 at 09:28:12AM -0700
References:  <199810221628.JAA06206@lestat.nas.nasa.gov>

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On Thursday, 22 October 1998 at  9:28:12 -0700, Jason Thorpe wrote:
> On Thu, 22 Oct 1998 10:26:51 +0200 (MET DST)
>  Nick Hibma <nick.hibma@jrc.it> wrote:
>
>> With X it should be possible, but I don't know how. Any pointers would
>> be appreciated. In text mode however I am unaware of any possiblities,
>> largely lacking probably because of the fact that there are no
>> possiblities to connect more than one keyboard and screen anyway at the
>> moment. Up to now.
>
> NetBSD's wscons can handle multiple text displays, keyboards, mice, etc.
>
> The big problem is crappy PC hardware.  If you plop more than one PCI VGA
> device in your system, You Lose, because they both attempt to map themselves
> in compatibility space so that the BIOS can talk to them.

I don't understand if you're intending to say "in some cases".  It's
certainly not true generally.  You can put as many PCI display boards
into a machine as will fit, and with the appropriate software you can
use them all at the same time.  I'm currently using two heads with XI
Graphics server, but will migrate to XFree86 as soon as the facility
is available (4.0).

> Some display controllers (notably, 3D accellerators) have a jumper
> to disable VGA mode completely, but then you only get a memory
> mapped frame buffer (if you're lucky :-)

Hmm.  I think this is your proviso.  You specifically mean VGA
compatibility.  Well, yes, if you want a graphics board to conform to
a standard which only allows one board, then you can only use one
board.  But there's more than just a frame buffer if you disable this
feature.

Greg
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