Path: utzoo!attcan!uunet!mcsun!ukc!edcastle!aimd
From: aimd@castle.ed.ac.uk (M Davidson)
Newsgroups: comp.sys.atari.st
Subject: MFP and xbtimer
Message-ID: <3282@castle.ed.ac.uk>
Date: 14 Apr 90 12:36:03 GMT
References: <3281@castle.ed.ac.uk>
Reply-To: aimd@castle.ed.ac.uk (M Davidson)
Organization: Edinburgh University Computing Service
Lines: 14


Hi, before my HD trashed I had written a program to re-vector the Timer
B interrupt using XBTIMER. It worked OK but at the end of the interrupt
routine I had to clear the service bit by simply clearing the correct
bit in the MFP register. 

Is that how it's meant to be done? I'm just looking for a cleaner way of
doing it - isn't it possible that the address of the MFP chip may change
at some time in the future. Is there a way of finding out these
addresses without taking them out of a book? Or are all the IO registers
high in memory guaranteed never to change?

Thanx again,
Mark.