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From: isle@dartvax.UUCP (Ken Hancock)
Newsgroups: comp.sys.mac
Subject: Re: MAC 256K SIMMs --> Mac ][  HELP
Message-ID: <7607@dartvax.UUCP>
Date: Wed, 11-Nov-87 14:06:34 EST
Article-I.D.: dartvax.7607
Posted: Wed Nov 11 14:06:34 1987
Date-Received: Sat, 14-Nov-87 15:22:12 EST
References: <5134@cisunx.UUCP>
Reply-To: isle@dartvax.UUCP (Ken Hancock)
Organization: Dartmouth College, Hanover, NH
Lines: 25

In article <5134@cisunx.UUCP> jasst3@cisunx.UUCP (Jeffrey A. Sullivan) writes:
>Question is this:  Can I just slip those 2 256K SImms into the second bank
>of the ]['s memory banks (along with another pair of 256K SIMMs) and have
>an extra meg?  Are the speeds of the chips OK?
>
>Also, is it possible to un-do a 2M expansion to an SE so I could use the 2
>1M SIMMs in the ][ and put the 256K SIMMs back in the SE?

First question.  The SE uses 150 nanosecond 256K SIMMs.  (-15 on the chip).
120 nanosecond chips should be used on the Mac II.  (-12).  I have heard
of people who have put in 150's...I don't know what the effect is...probably
slower memory.  (Anyone from Apple care to clarify this?)

Second Question.  It should be reversable as long as you have the -12 1MB
SIMMs.  I believe that a resistor should have also been removed when the
2 1MB SIMMs were swapped for the 256K SIMMs, so that would also have to
be replaces.

Ken

-- 
Ken Hancock      UUCP: isle@dartvax
               BITNET: isle@u2.dartmouth.edu

DISCLAIMER: If people weren't so sue-happy, I wouldn't need one!