Message-Id: <m0yuhc0-000S4IC@inti.gov.ar>
Comments: Authenticated sender is <salvador AT natacha DOT inti DOT gov DOT ar>
From: "Salvador Eduardo Tropea (SET)" <salvador AT inti DOT gov DOT ar>
Organization: INTI
To: Endlisnis <s257m AT unb DOT ca>, djgpp AT delorie DOT com
Date: Fri, 10 Jul 1998 15:17:14 +0000
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Subject: Re: Two Monitor setup and RHIDE.  thinking of doing this.
In-reply-to: <Pine.SOL.3.96.980710111403.12175C-100000@sol.sun.csd.unb.ca>
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Endlisnis <s257m AT unb DOT ca> wrote:

> On Thu, 9 Jul 1998, temujin wrote:
> ->In the docs it says that you can do this with a VGA and a mono 
> ->monitors/vid cards.  I'm just wondering if ANYONE has gotten this to
> ->work, and if is possible to just use  2 vga cards/monitors to do this as
> ->well or MUST it be vga/mono?
> ->Kinda interested to know, before I go out and buy the extra parts,
> ->because continually re-booting my machine when debugging a SVGA program
> ->in RHIDE and the screen goes all to pot.
> 	Do not try it with 2 VGA cards.  The only reason it works with 1
> vga and one mono is because they use a different address space for their
> frame buffers and stuff.  Placing 2 VGA cards in one machine will cause
> one to fry. 

Nahh!! don't be so extremist, the machine won't start in the worst 
case because both BIOS will be mapped in the same address.

>  I have been told that it is possible to use 2 PCI SVGA cards,
> I've never tried it, but Win98 was supposed to have support for multiple
> monitors.

There are special hardware for it (8 monitors served by one card). 
The main problem with normal cards is the BIOS, it insist to map the 
I/O ports in the I/O space. 
Programming the PCI registers you can map the I/O ports in memory and 
move the BIOS location, but most of the BIOS won't help at all to do 
it. So with normal boards you must take out the chip, and then do all 
the job by hand. Linux will support multiheading (more than one 
output device) with the GGI project, some people in the project is 
experimenting with S3 cards making just that (no BIOS).

SET

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