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From: agesen@daimi.UUCP (Ole Agesen)
Newsgroups: comp.sys.atari.st
Subject: IOTRANSFER & interrupts.
Message-ID: <850@daimi.UUCP>
Date: Wed, 15-Jul-87 09:38:07 EDT
Article-I.D.: daimi.850
Posted: Wed Jul 15 09:38:07 1987
Date-Received: Sat, 18-Jul-87 04:42:29 EDT
Reply-To: agesen@daimi.UUCP (Ole Agesen)
Distribution: world
Organization: DAIMI: Computer Science Department, Aarhus University, Denmark
Lines: 13

I'm quite new to this newsgroup, so maybe this problem already has been
discussed. Anyway ...
I'm writing a program on the 520 ST (1 MByte RAM) using TDI Modula-2/ST.
The program have to multitask.
I hope it'll be possible to use the standard modula statement IOTRANSFER in
a scheduler. But, but, ... here is my problem:
I don't know, which device to use to generate periodic interrupts (50-200
pr second would be fine). There should be a Timer-A somewhere.
The XBIOS-functions don't seem of much help - or perhaps I just don't 
understand 'em well enough.
Can anyone help me to some info about Timer-A (control/data-register?,
interruptvector?, how to access it), or even better: has anyone
used multitasking in modula-2 on the ST.