* a silly question....8 bit color supprted in 386 vga?
@ 1995-11-13 5:20 Kenji
0 siblings, 0 replies; 4+ messages in thread
From: Kenji @ 1995-11-13 5:20 UTC (permalink / 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?
Kenji
^ permalink raw reply [flat|nested] 4+ messages in thread
* a silly question....8 bit color supprted in 386 vga?
@ 1995-11-13 7:54 Kenji
0 siblings, 0 replies; 4+ messages in thread
From: Kenji @ 1995-11-13 7:54 UTC (permalink / 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....
Kenji
^ permalink raw reply [flat|nested] 4+ messages in thread
* a silly question....8 bit color supprted in 386 vga?
@ 1995-11-15 5:43 Kenji
0 siblings, 0 replies; 4+ messages in thread
From: Kenji @ 1995-11-15 5:43 UTC (permalink / 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
^ permalink raw reply [flat|nested] 4+ messages in thread
* a silly question....8 bit color supprted in 386 vga?
@ 1995-11-15 8:21 Kenji
0 siblings, 0 replies; 4+ messages in thread
From: Kenji @ 1995-11-15 8:21 UTC (permalink / raw)
Reply to myself.
> > >
> > > 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.
This has been discussed here, which I've missed to understand.
Adding one line of
kernelpercent=40
in plan9.ini solved above problem. Now, I can see 8 bit color image on
1024x768x8i mode.
Kenji
^ permalink raw reply [flat|nested] 4+ messages in thread
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