Article View: comp.sys.mac
Article #43875Mac II upgrade
From: jovanovic
Date: Thu, 14 Dec 1989 22:42
Date: Thu, 14 Dec 1989 22:42
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1407 bytes
I have a Mac II that I'd like to upgrade, but I'm not sure about what the best way to do this is. I know the 68881 and 68882 are pin compatible, so replacing the 68881 with a 16MHz 68882 is no problem. But what about using a 25MHz 68882? Or would this show no real performance increase because of hardware-imposed wait states? Also, I'd like to add a PMMU, but would rather replace the 68020 directly with a 68030, although I don't know whether or not they're pin compatible. If they're not pin compatible, then I guess that means I have to go with a PMMU. But if by chance the 68030 is pin compatible, again, what real effect would there be in using a 25MHz chip rather than a 16MHz chip? Are wait states software- rather than hardware- imposed? Thanks for your help, and I'll summarize replies in a future posting. -steve. -- ----------------------------------------------------------------------- stevej@studsys.mu.edu Marquette University Electrical Engineering
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uwm.edu!marque!studsys!stevej From: stevej@studsys.mu.edu (jovanovic) Newsgroups: comp.sys.mac,comp.sys.mac.hardware Subject: Mac II upgrade Keywords: Mac II, PMMU, 68030, 68882 Message-ID: <722@studsys.mu.edu> Date: 14 Dec 89 22:42:50 GMT Followup-To: poster\ Organization: Marquette University - Milwaukee, Wisconsin Lines: 23