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Path: utzoo!linus!philabs!cmcl2!seismo!mcvax!ukc!warwick!dpa
From: dpa@warwick.UUCP (David Angier)
Newsgroups: net.micro.cbm
Subject: Re: Flaky TOD Alarm Interrupts
Message-ID: <179@snow.warwick.UUCP>
Date: Thu, 23-May-85 04:09:35 EDT
Article-I.D.: snow.179
Posted: Thu May 23 04:09:35 1985
Date-Received: Fri, 24-May-85 21:34:09 EDT
References: <1755GMW@psuvm>
Reply-To: dpa@warwick.UUCP (David Angier)
Organization: Computer Science, Warwick University, UK
Lines: 13

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If I understand this correctly you would be wiser to use a timer
in one of the CIA's.  Timer 1 is the only one that works correcly,
timer 2 has flaky interrupts also, take the time interval and
multiply by the clock rate (~.9 Megs, see Reference Guide for more
accurate detail) and store it in the counter registers.
Also set the control register to continual running mode, force load
running.
I recommend using CIA 2 to generate NMI's since these won't be ignored.
Also the Interrupt enable register needs to be set (write a $81 to it).

                        Dave (Maths @ Warwick University (UK) )

                            ..!mcvax!ukc!warwick!snow!dpa