Path: utzoo!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!mcsun!hp4nl!star.cs.vu.nl!ast
From: ast@cs.vu.nl (Andy Tanenbaum)
Newsgroups: comp.os.minix
Subject: Re: ega bug
Message-ID: <5282@star.cs.vu.nl>
Date: 5 Feb 90 09:54:35 GMT
References: <12500002@ucf-cs.ucf.edu>
Sender: news@cs.vu.nl
Organization: Fac. Wiskunde & Informatica, VU, Amsterdam
Lines: 13

In article <12500002@ucf-cs.ucf.edu> richard@ucf-cs.ucf.edu writes:
>I have heard rumors of an "EGA bug."  Does anyone remember far back enough
>to tell me if this is that bug, and what the fix is?

The problem is that EGA video RAM does not wrap around the way the IBM PC
video RAM does.  Thus EGA is not IBM compatible. :-(

The fix is to do all the scrolling in software.  Starting with 1.3, this
feature was standard.  You hit the F3 hit to enable it.  It is slower, but
it works.  The fix is moderately complicated, and involves a lot of
assembly code.

Andy Tanenbaum (ast@cs.vu.nl)