9fans archive / 1995 / 08 / 14 /    prev next

From: jmk@pla... jmk@pla...
Subject: aux/vga
Date: Tue, 1 Aug 1995 23:24:47 -0400

the S3 chip (which one is it?) thinks it can do 2x8-bit pixels at a time
at the higher resolutions, but it sounds like it's a standard 8-bit dac and it can't
do that (the dac you gave looks like a typo), so you see the image twice.
the highest clock you can use is 80MHz in this case.

still, it shouldn't be allowed to happen, but the insides of aux/vga are a twisty
mess. more information please.

------ original message follows ------

>From cse.psu.edu!9fans-outgoing-owner Tue Aug  1 21:44:20 EDT 1995
Received: by psuvax1.cse.psu.edu id <34120>; Tue, 1 Aug 1995 21:18:14 -0400
Received: from staff.cs.su.OZ.AU ([129.78.8.1]) by psuvax1.cse.psu.edu with SMTP id <34143>; Tue, 1 Aug 1995 20:42:01 -0400
Received: from plan9.cs.su.oz.au by staff.cs.su.OZ.AU (mail from boyd for
	9fans@cse...)
	with MHSnet (insertion MHSnet site: staff.cs.su.oz.au); Wed, 02 Aug 1995 09:46:22 +1000
Received: from lore.plan9.cs.su.oz.au. by staff.cs.su.OZ.AU.; Wed, 02 Aug 1995 09:46:20 +1000
From:	Boyd Roberts <boyd@pla...>
Date:	Tue, 1 Aug 1995 19:19:14 -0400
To:	9fans@cse...
Subject: aux/vga
Message-ID: <199508020919.5148.9.babig@pla...>
Sender: owner-9fans@cse...
Precedence: bulk
Reply-To: 9fans@cse...

I have a problem with aux/vga and my Quadtel S3 video board.  The standard
/lib/vgadb entry wasn't working so I looked at the board and saw it had a
att20c40-80 chip in in so I changed the ramdac entry, and then reordered
link=3clock ... so it was before the ramdac entry (don't ask me how I
worked this out :-) and changed the clock field to be icd2061a.

Then I run aux/vga -l and the weirdest thing happens:  I get two half
screens, side by side, which are identical; the mouse tracks in both
and 8 1/2 runs fine.  I think I'm close at this stage, but I'm at a
loss to understand what's happening (the only thing I know about PC
hardware is that diskette rhymes with whiskette).  Any clues?

The aux/vga and /lib/vgadb I have come from the pre-release that we have here.