Date:	Mon, 12 May 1997 18:16:14 +0100
From:	Matthias Paul <PAUL-MA AT reze-1 DOT rz DOT rwth-aachen DOT de>
Subject:	Re: Cirrus Logic Cards
To:	opendos AT delorie DOT com
Reply-to:	Matthias DOT Paul AT post DOT rwth-aachen DOT de
Message-id:	<81EE4B745C@reze-1.rz.rwth-aachen.de>
Organization:	Rechenzentrum RWTH Aachen

On Sat, 10 May 1997, Bill Phillips wrote:

> On the other hand, I have been having odd problems in WfWG 3.11 
> involving the card, or its drivers. And I am running that on top 
> of OpenDOS, though I doubt that would have any effect (pretty 
> totally separate I/O systems, aren't they?). In fact, if anyone 
> has any tips re: Cirrus/Windows problems, I'd like to hear them.

Developing the built-in screen-saver of our K3PLUS keyboard 
driver back in 1993-1994, Axel and I had some problem reports on 
Cirrus VGA cards.  For our case, we tracked this down to a register 
incompatibility of these cards compared to the original IBM VGA 
and other clones.  At present, I do not know all of the VGA bits
by their forename any more, but at that time we had used one of the
'standard' VGA methods to blank a screen.  After we used the EGA 
method on Cirrus cards, our problems disappeared.  At least, these 
older Cirrus VGA adaptors are not fully VGA compatible at register 
level. 

Maybe I have dropped in some comments on Cirrus cards when I wrote 
the video card stuff of Wim Osterholt's PORTS.LST some years ago
(see Ralf Brown's interrupt list for details), I'm not sure any more. 

 Matthias
  
--------------------------------------------------------------------
 Snail mail: Matthias Paul, Ubierstrasse 28, D-50321 Bruehl, Germany
 New eMail : <Matthias DOT Paul AT post DOT rwth-aachen DOT de>                    
 Web       : URL: http://www.rhrz.uni-bonn.de/~uzs180/mpdokeng.html 
--------------------------------------------------------------------

- Raw text -