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From: comp13@tjalk.UUCP
Newsgroups: comp.os.minix
Subject: Re: More on polled keyboards
Message-ID: <773@tjalk.cs.vu.nl>
Date: Fri, 20-Feb-87 04:50:46 EST
Article-I.D.: tjalk.773
Posted: Fri Feb 20 04:50:46 1987
Date-Received: Sun, 22-Feb-87 01:46:27 EST
Reply-To: comp13@cs.vu.nl (Ogilvie R P)
Distribution: world
Organization: V.U. Informatica, Amsterdam, the Netherlands
Lines: 10
Summary: Andy's question 'letting BIOS return control to OS'


In short, if you talk about a PC or XT I don't think it is possible.
The BIOS of these machines have no hooks and since the BIOS is in ROM
even if you would know where to patch an 'iret' or so, you couldn't
patch it anyway (because it is in ROM.
   As you know, the AT has hooks using INT 15h with a sub-code.

Let's join the original design: forget the BIOS!

Paul Ogilvie