From: s_titz@ira.uka.de (Olaf Titz) Subject: Re: > 80x25 on REALTEK VGA? Date: 5 Apr 1993 14:54:01 GMT
In article <7722@blue.cis.pitt.edu> broadley@pitt.edu (Bill Broadley) writes:
> Anybody manage to get more then 80x25 working with a REALTEK VGA?
Yes, I have the same brain-dead thing...
> Anyway to change the console screen size after booting?
Not after booting; I suspect that too much of the internal data
structures concerning VC handling are fixed (Correct me if I'm wrong?)
But it is possible to set screen mode *during* boot. I've patched
boot/setup.S accordingly. (In fact I've used BIOS calls as I don't
know much about VGA register programming...)
I'll send you the patches; if anybody has interest in that too please
mail me.
> I don't really expect X to work at all (maybe mono), but thats
> after the consoles work.
It runs, save for one catch. (I've figured out a set of modes (mono
only) that gives a highest resolution of 800x600, virtual 800x600 too
on my supposedly-fixed-frequency screen (which I'm stretching a bit,
but it runs stable...)
The problem is that sometimes, on restoring text mode, X fails to
reset the font, i.e. you get garbage in text mode and the system
remains unusable (except you fire up X again). I suspect the problem
lies with the X server, and from the vgalib sources I think I have
gotten a clue about where the problem is: some VGAs apparently need
re-setting the fonts on two banks instead of one only (I'm not exactly
sure how this works.)
Olaf
--
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