Path: utzoo!utgpu!watmath!clyde!ima!think!ephraim From: ephraim@think.COM (Ephraim Vishniac) Newsgroups: comp.sys.mac Subject: Re: 1.75Mb Mac Plus possible? Message-ID: <33209@think.UUCP> Date: 9 Dec 88 15:03:42 GMT References: <870265@hpcilzb.HP.COM> Sender: news@think.UUCP Reply-To: ephraim@think.com (Ephraim Vishniac) Organization: Thinking Machines Corporation, Cambridge MA, USA Lines: 16 In article <870265@hpcilzb.HP.COM> cnc@hpcilzb.HP.COM (Chris Christensen) writes: >I have always heard about making a 2.5Mb Mac+ or a 4Mb one. Can you >replace one of the SIMMs to get a 1.75Mb machine or three to get a >3.25Mb one? Or is there something magical about replacing an even >number of them? Yes, there is. The Plus and SE have a 16-bit bus. SIMMs are 8 bits wide. Similarly, the Mac II's 32-bit bus requires that you install SIMMs in identical groups of four. Ephraim Vishniac ephraim@think.com Thinking Machines Corporation / 245 First Street / Cambridge, MA 02142-1214 On two occasions I have been asked, "Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?"