Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!rutgers!sri-spam!mordor!lll-tis!ames!ucbcad!ucbvax!YALE.ARPA!fischer-michael From: fischer-michael@YALE.ARPA (Michael Fischer) Newsgroups: comp.sys.atari.st Subject: Re: MFP problems Message-ID: <8706241459.AA04692@yale-eli.arpa> Date: Wed, 24-Jun-87 10:59:52 EDT Article-I.D.: yale-eli.8706241459.AA04692 Posted: Wed Jun 24 10:59:52 1987 Date-Received: Fri, 26-Jun-87 05:27:55 EDT Sender: daemon@ucbvax.BERKELEY.EDU Distribution: world Organization: The ARPA Internet Lines: 23 I'm still trying to install my own timer, and stumbled over the 'fact', that the system's timer ('C') is said to generate a 200hz- interrupt... As far as I can see it's installing procedure uses a division factor of 64 (decimal, I suppose), and a counter that's set to 192 (C0 hex). IF I believe my documentation which says that the MFP 68901 uses a 4Mhz - clock cycle, then what? All the divisions mentioned above wouldn't at all generate a 200hz-interrupt. Am I wrong? What I need are the data and control values for getting a one-millisecond resolution. Any suggestions? Yours in advance, Klaus. A 200hz interrupt has a 5 millisecond period. The numbers you give are not far off, if the '64' is interpreted as a hex number (= 100 decimal), for then the timer would interrupt every 100*192 clock cycles, or every 19.2/4 = 4.8 milliseconds. --Mike Fischer Arpanet: Bitnet: -------