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From: dgold@apple.UUCP (David Goldsmith)
Newsgroups: comp.sys.mac
Subject: Re: MAC 256K SIMMs --> Mac ][  HELP
Message-ID: <6726@apple.UUCP>
Date: Fri, 13-Nov-87 14:07:43 EST
Article-I.D.: apple.6726
Posted: Fri Nov 13 14:07:43 1987
Date-Received: Sun, 15-Nov-87 10:58:11 EST
References: <5134@cisunx.UUCP> <11540041@hpsmtc1.HP.COM>
Reply-To: dgold@apple.UUCP (David Goldsmith)
Organization: Apple Computer Inc., Cupertino, USA
Lines: 25

In article <11540041@hpsmtc1.HP.COM> kwallich@hpsmtc1.HP.COM (Ken Wallich) writes:
>The Mac II comes with 120ms chips.  The SE comes with 150ms chips.
>The Mac II will run with ALL 120ms chips, or ALL 150ms chips, but if you 
>combine the two, it will only recognize the faster (120ms) chips.  You could
>put 120ms chips in your SE, but I don't know how well this works (I have a
>MacII :-).  Also I assume you mean 4 256K SIMMs to make a Meg.  Even though
>they sell them in 2's, 1 SIMM is either 256K or 1MB depending on the chips.

You CANNOT use 150ns SIMMs in the Macintosh II AT ALL, under ANY conditions.
The Mac II only works with 120ns RAM.  It has nothing to do with mixing 120ns
with 150ns; only 120ns RAM is fast enough.  Some people may succeed in using
150ns RAM because the parts they are using exceed spec and are in fact fast
enough, but there is no guarantee that will work -- you may experience
intermittent errors.  Repeat:  use ONLY 120ns RAM in the Mac II.

The Mac SE will work fine with either 150ns RAM, 120ns RAM, or any mixture of
the two.
-- 
David Goldsmith
Apple Computer, Inc.

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