Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!evax!cs4344af From: cs4344af@evax.arl.utexas.edu (Fuzzy Fox) Newsgroups: comp.sys.cbm Subject: Re: More accurate timer? Message-ID: <1990Dec19.213713.14856@evax.arl.utexas.edu> Date: 19 Dec 90 21:37:13 GMT References: <16200014@col.hp.com> Organization: Computer Science Engineering Univ. of Texas at Arlington Lines: 21 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? Yes, use one of the TOD clocks available on the 6526 chips. They will give you a measure of time to within a tenth of a second, and they operate independently of the operation of the rest of the computer, so disk access or other activities that disrupt the jiffy clock will not affect them. The clocks are located at $DC08-$DC0B and $DD08-$DD0B in memory. For a good treatise in programming the clocks (and the 128 in general) I recommend "Mapping the Commodore 128," by Ottis R. Cowper, from COMPUTE! Books. -- begin 644 .signature G5&AI