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Message-ID: <3757D550.57A64E5D@inti.gov.ar>
Date: Fri, 04 Jun 1999 10:32:00 -0300
From: salvador <salvador AT inti DOT gov DOT ar>
Organization: INTI
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To: djgpp AT delorie DOT com
Subject: Re: dual display with svga
References: <199906041223 DOT OAA22496 AT acp3bf DOT physik DOT rwth-aachen DOT de>
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Reply-To: djgpp AT delorie DOT com

Hans-Bernhard Broeker wrote:

> In article <3756DE1A DOT 62044C1F AT usa DOT net> you wrote:
> > Hi, DJ. I'm using RHIDE to develop a graphic game, and I want to use the
> > 'dual display' feature. I'm using an AGP video card as primary adapter
> > with an 17" color monitor. From my old equipment I've and old svga
> > monitor with a cheap trident 9440 adapter. Can I use them on RHIDE
> > instead of the hercules mono adapter/mono monitor combo?
>
> To the best of my (imperfect) knowledge,

Not so bad ;-)

> you can't. The secondary card
> absolutely *has* to be a mono / hercules one. That's because these
> cards have memory layouts completely separate from those of all the
> color cards (CGA, EGA, VGA, and up), so you don't get any conflicts.
>
> There used to be some TSENG ET3000 or ET4000 cards that could be
> switched to 'hercules hardware compatibility mode', or something like
> that, I think, but your Trident won't help you a bit, there.

The main problem is the boot sequence, if the computer starts you can then:

1) Map the Trident registers in memory (Using the PCI stuff).
2) Put the mode in hercules mode (there are VGA registers for it).
3) Map the I/O ports in I/O space again, but this time in the hercules
region.

But all of this is supposing you won't have a collision between the 2 BIOSes.
I know some people of the GGI project tried with S3 boards just removing the
BIOS of one of the boards. But you must do some low level stuff and as
hercules and MDA boards are trashed is easier to just get on of them ;-)

SET

--
Salvador Eduardo Tropea (SET). (Electronics Engineer)
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