Path: utzoo!utgpu!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!unmvax!ncar!ames!pasteur!ucbvax!hplabs!hpda!hpcuhb!hpcilzb!cnc From: cnc@hpcilzb.HP.COM (Chris Christensen) Newsgroups: comp.sys.mac Subject: 1.75Mb Mac Plus possible? Message-ID: <870265@hpcilzb.HP.COM> Date: 7 Dec 88 18:06:40 GMT Organization: HP Design Tech Center - Santa Clara, CA Lines: 18 from another note: > >The Macintosh Plus and SE both only have space for a total of 4 SIMMs >(the Macintosh II has space for 8 SIMMs). So to upgrade your 1Mb system >which uses 4 256K SIMMs to 2Mb, you have to remove two of the 256K SIMMS >and replace them with two 1Mb SIMMs (giving you a total of 2.5Mb). As >for the 120ns chip speed, that speed is fine in an SE (if I am not >mistaken, the Plus and SE only need 150ns but the increased speed of the >MacII requires the 120ns chips). > 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? It sure would be nice on my pocket book if I could upgrade one SIMM at a time. Chris Christensen