Xref: utzoo comp.sys.mac.hardware:11983 comp.sys.m68k:2361 Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!sci.ccny.cuny.edu!dsndata!wayne From: wayne@dsndata.uucp (Wayne Schlitt) Newsgroups: comp.sys.mac.hardware,comp.sys.m68k Subject: Re: 68040 for 68030 substitution (question) Message-ID: Date: 10 Jun 91 20:22:07 GMT References: Sender: wayne@dsndata.UUCP Organization: Design Data Lines: 22 In-reply-to: alanr@cecelia.media-lab.media.mit.edu's message of 28 May 91 21:55:16 GMT In article alanr@cecelia.media-lab.media.mit.edu (Alan Ruttenberg) writes: > > I was wondering if a 68040 can be substituted for a 68030 in a > MacIIfx. I understand that the pinouts and the clock rate (40Mhz 030 > 25Mhz 040) are different. > > What I am curious about is what a minimal upgrade to a 040 would > entail. Can I buy a chip, and build a small adapter board? Or are > there many changes that would have to be made. > i dont think you can easily replace a 68030 with a 68040. hp has a board that makes a 50MHz 68030 look like a 25Mhz 68040. i know they are going to have a lot of those boards laying around from all the upgrades they are doing but i doubt that you could get one. from the size and complexity of the board, i would say that the problem is far from trivial... -wayne