From: Kenji Okamoto okamoto@earth.cias.osakafu-u.ac.jp
Subject: a silly question....8 bit color supprted in 386 vga?
Date: Wed, 15 Nov 1995 00:43:24 -0500 [thread overview]
Message-ID: <19951115054324.WAzeZFDAfJyVD-h-hWe3Pxrv82X3qCcEwh5Ypq9x4t4@z> (raw)
> >
> > I'm using et4000, att20C490-85, ics2494a set.
> > This works fine for 1024x768x1i as I reported. However, after I set
> > my "MACHSPEED VGA 1600" card to 1024x768x8i (14" older display), very
> > atrange behaviors I'm seen. 8-1/2 runs ok, and displays b/w background
> > on the display. Then, I tried New command, and located the terminal
> > emulater area by mouse, then, nothing came up with.
> >
> > Is the 8 bit color mode is supported on this assembly?
> > What kinds of colors should I see, if I set it as 1024x768x8?
>
> If I choose 640x480x8, I can see color image....
Further trying revealed follows:
conditions: BIOS shadow is enabled for VGA (C0000-C7FFF).
my terminal has only 8MB memory, and older low frequency VGA
monitor (up to 45 KHz horizontal frequency).
640x480x1: Of course, no problem. ^_^
640x480x8: No problem to display color images such as dna.3c, table.3c etc.
800x600x8: no problem for smaller size of color image. For larger image,
9v says "Can't read image".
1024x768x1i: every thing works fine without color. :-)
1024x768x8i: 8-1/2 comes up, but terminal emulater box cannot be
set. I can see and set only rubberband. After its setting,
it disappeares.
If BIOS shadow is set disabled, things are miserable, that is controller
not found. Even if I set environment variable as /env/vgactl, it goes to
panic.
Above observation seems to show me a problem on memory space. My memory
setting reported by Plan 9 is as follows:
1253 free pages, 5012K bytes, swap 29972K, highwater 248K, headroom 308K.
Well, I'm still investigating what's wrong. However, I started to doubt
the codes of vga drivers (under the /sys/src/cmd/aux/vga) spent much time.
I got tired.... If anyone else could help me where I'd better to
investigate, please let me know it.
Kenji
next reply other threads:[~1995-11-15 5:43 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
1995-11-15 5:43 Kenji [this message]
-- strict thread matches above, loose matches on Subject: below --
1995-11-15 8:21 Kenji
1995-11-13 7:54 Kenji
1995-11-13 5:20 Kenji
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=19951115054324.WAzeZFDAfJyVD-h-hWe3Pxrv82X3qCcEwh5Ypq9x4t4@z \
--to=9fans@9fans.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).