Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!helios.physics.utoronto.ca!alchemy.chem.utoronto.ca!mroussel
From: mroussel@alchemy.chem.utoronto.ca (Marc Roussel)
Newsgroups: comp.sys.cbm
Subject: Re: More accurate timer?
Message-ID: <1990Dec19.203435.6068@alchemy.chem.utoronto.ca>
Date: 19 Dec 90 20:34:35 GMT
References: <16200014@col.hp.com>
Organization: Department of Chemistry, University of Toronto
Lines: 17

In article <16200014@col.hp.com> warren@col.hp.com (Warren Tustin) writes:
>Is there a way to do timing on the C128 that is more accurate than the 
>jiffy clock?

The C64 is capable of a time resolution of about 1 microsecond.  The
method by which this is accomplished is documented in

Z. Szepesi, Transactor vol. 6, no. 4, pp. 35-37 (Jan. 1986).

The 6526 CIA's have general purpose timers that can count in
well-defined increments (not interrupted by I/O) up to 70 minutes.  (How
big these increments are exactly depends on which side of the Atlantic
you're on.  It's about 1us in both cases and the conversion factor from
clock ticks to seconds is calculable.  I'll let you read the article.)

				Marc R. Roussel
                                mroussel@alchemy.chem.utoronto.ca