Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!nrl-cmf!ames!pasteur!ucbvax!hplabs!hp-pcd!hpcvlx!everett
From: everett@hpcvlx.HP.COM (Everett Kaser)
Newsgroups: comp.sys.ibm.pc
Subject: Re: EGA and the Leading Edge
Message-ID: <101000024@hpcvlx.HP.COM>
Date: 17 Nov 88 20:26:41 GMT
References: <355@oucsace.cs.OHIOU.EDU>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 13

Actually, my hunch is that this is a result of adding the EGA card into a
PC XT type BIOS machine.  I put an EGA card into an IBM PC, and lo and behold!
the same thing happens.  My hunch is that the ROM on the EGA card takes over
some vectors, and then jumps back into the BIOS ROM init code BEFORE the
BIOS ROM's beep, so that things can get re-initialized properly (with the EGA
ROM in the loop).  This doesn't need to happen on an AT class machine, as the
AT class BIOS is written with EGAs in mind.

On the other hand, this is all guessing, so I could have pie in my face ...

Everett Kaser
!hplabs!hp-pcd!everett
everett%hpcvlx@hplabs.hp.com