Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!sdd.hp.com!caen!uwm.edu!linac!midway!ellis.uchicago.edu!jcav From: jcav@ellis.uchicago.edu (john cavallino) Newsgroups: comp.sys.mac.hardware Subject: Re: Mac II modifications ... Message-ID: <1991Mar6.154517.10703@midway.uchicago.edu> Date: 6 Mar 91 15:45:17 GMT References: Sender: news@midway.uchicago.edu (News Administrator) Organization: University of Chicago Lines: 23 In article bh11+@andrew.cmu.edu (Braddock John Hathaway) writes: >I was just wondering ... what would be the effect of putting a >20MHz 68020 in a stock Mac II ... would there be a speedup or >would the chip just run cooler than before? > >I realize that I am showing my hardware ignorance by asking this, >but I'm curious anyway. > >Thanks, > >Brad The speed (mHz) at which the processor runs is determined by a crystal oscillator, not the chip itself. The speed rating on the chip is the manufacturer's recommended max clock rate for that particular chip. Putting a 20mhz 68020 in a stock mac II will run the chip at the clock rate of a stock Mac II, which is a little under 16mhz. Sorry. -- John Cavallino | EMail: jcav@midway.uchicago.edu University of Chicago Hospitals | USMail: 5841 S. Maryland Ave, Box 145 Office of Facilities Management | Chicago, IL 60637 "Opinions, my boy. Just opinions" | Telephone: 312-702-6900