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From: Jim.Spencer@p510.f22.n282.z1.fidonet.org (Jim Spencer)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Adding 1MB to an old Macintosh+
Message-ID: <3.279FC793@mmug.mn.org>
Date: 25 Jan 91 05:03:04 GMT
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Kathy Strong writes in a message to All

KS> The dealer was correct. You must buy TWO 1MB SIMMs (100ns or 
KS> faster). You will remove two of the existing 256K SIMMs (the 
KS> two that are behind the other two, if I recall correctly) and 
KS> replace them with the 1MBs. You will try to find someone to buy 
KS> the 256ers, and fail. :-) Look for the resistor--it's fairly 
KS> close to the left bank of SIMMs, I think (can you tell it's been 
KS> a while since I did this?)... anyway, it's labeled something 
KS> like "256K only." Clip it off and you're done. 

You are correct except for the speed of the SIMMs: a Plus only needs 150 ns or faster.  The SE/30 and most of the II line need 120ns or faster.  Only the newer faster machines need anything faster.  Faster RAM however has the advantage that if you upgrade your Mac you can take your RAM with you.