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