Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!gatech!rutgers!cbmvax!rsbx
From: rsbx@cbmvax.UUCP (Raymond S. Brand)
Newsgroups: comp.sys.amiga.tech
Subject: Re: 8520 (CIA) timers
Message-ID: <7220@cbmvax.UUCP>
Date: 6 Jul 89 16:04:32 GMT
References: <12524@well.UUCP>
Distribution: comp
Organization: Commodore Technology, West Chester, PA
Lines: 11

> I am using the 8520 chips to do some timing, and I am having one major problem.
> Nowhere can I find out what the period of time is that I am counting.  I am
> using the "count 02 pulses" mode, whatever that means.  That is the phrase
> used in the 1.1 Hardware Reference Manual.  Could some one please tell me how
> many microseconds one of these timer ticks is?  Thanks.

Currently (1.4 will provide a way for you to find the EClock (02 pulse)
frequency) the timers run at 715909 Hz if you have an NTSC machine and at
709397 Hz if you have a PAL machine.

Raymond S. Brand	rsbx@cbmvax.uucp