* aux/vga
@ 1995-08-01 23:19 Boyd
0 siblings, 0 replies; 4+ messages in thread
From: Boyd @ 1995-08-01 23:19 UTC (permalink / raw)
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.
^ permalink raw reply [flat|nested] 4+ messages in thread
* aux/vga
@ 1995-08-03 0:21 Boyd
0 siblings, 0 replies; 4+ messages in thread
From: Boyd @ 1995-08-03 0:21 UTC (permalink / raw)
oops, a typo: I have an att20c490-80.
I tried out another s3 pc and that just worked fine with the standard
setup. It's this digital lpv+ 433sx I have that has the problem.
A minor point: aux/vga's usage message includes an f option, which it
doesn't support.
^ permalink raw reply [flat|nested] 4+ messages in thread
* aux/vga
@ 1995-08-02 15:48 Berry
0 siblings, 0 replies; 4+ messages in thread
From: Berry @ 1995-08-02 15:48 UTC (permalink / raw)
>>>Boyd Roberts said:
>
> 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?
This sounds like a bug I had when I was doing a port of the X11R4 server to
MS-DOS (for my sins, don't ask) about 4 years ago. Time has muddied the details,
and my jerk boss would insist they were proprietary anyway (he's not my boss anymore,
thank God) but I seem to remember that it had to do with the VGA board
being in 4-bit deep mode (16 colors) when the program thought it was in 8-bit
deep mode (256 colors) or maybe vice versa.
I recently had a similar occurence on a Linux laptop, where Mosaic was too
stupid to understand about Visuals other than 8-bit deep and 1-bit deep.
Shit. What a mess. I can't wait for my plan9 CDROM to arrive....
--berry
(P.S. I realize I probably haven't specifically helped Boyd, and have
whined a lot, but I hope I have pointed him at the right place to look)
Berry Kercheval :: Xerox Palo Alto Research Center
^ permalink raw reply [flat|nested] 4+ messages in thread
* aux/vga
@ 1995-08-02 3:24 jmk
0 siblings, 0 replies; 4+ messages in thread
From: jmk @ 1995-08-02 3:24 UTC (permalink / raw)
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.
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From: Boyd Roberts <boyd@plan9.cs.su.oz.au>
Date: Tue, 1 Aug 1995 19:19:14 -0400
To: 9fans@cse.psu.edu
Subject: aux/vga
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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.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~1995-08-03 0:21 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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1995-08-03 0:21 aux/vga Boyd
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