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From: ast@cs.vu.nl (Andy Tanenbaum)
Newsgroups: comp.os.minix
Subject: Re: Quest for hardware docs and EGA display problem
Message-ID: <500@ast.cs.vu.nl>
Date: Wed, 16-Sep-87 10:45:18 EDT
Article-I.D.: ast.500
Posted: Wed Sep 16 10:45:18 1987
Date-Received: Sat, 19-Sep-87 01:42:04 EDT
References: <489@louie.udel.EDU> <369@focus.UUCP>
Reply-To: ast@cs.vu.nl (Andrew S. Tanenbaum)
Organization: VU Informatica, Amsterdam
Lines: 19

In article <369@focus.UUCP> jum@focus.UUCP (Jens-Uwe Mager) writes:
>>Random problem: Every machine equipped with an EGA card seemed to have
>>display problems, to wit: at various random times the screen would
>>blank.  Pressing -RETURN- until the last displayed line scrolled off
>>would restore the display.  Mono and CGA cards don't seem to have the
>>problem.  Has anyone else noticed this?  Is there a fix?
>
>We have got the same problem on a Toshiba T1100, which is supposed to
>emulate a CGA card, so this does not appear to be bound to EGA cards.
>-- 
This problem has been reported many times before.  MINIX 1.1 assumed
that all video cards used the 6845 chip.  The EGA card doesn't.  MINIX
1.2 has a fix that makes it work fine with the IBM EGA card.  Many EGA
clones aren't compatible with either the 6845 or the IBM EGA card.  
Finally I gave up in disgust and installed the soft scrolling fix that
Larry Hubble posted earlier.  This went out a few days ago.  I think
that with this fix the resulting system (call it MINIX 1.2a) should work
on any EGA card system.  If anyone notices otherwise, post something.
Andy Tanenbaum (ast@cs.vu.nl)