Memory Upgrades

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Article #21623

#21623

From: David W. Berry
Date: Sat, 14 Nov 1987 00:55

55 lines
2671 bytes

In light of the rash of postings on upgrading memory in the SE and
the II, I offer the following bits of wisdom in hopes that we can
eliminate traffic on the matter.  If you have further questions please
contact me via mail or phone.

	Macintosh II

	Configuration		Add		Remove
	1 Meg			As shipped
	2 Meg			4 * 256K SIMMS
	4 Meg			4 * 1M SIMMS	4 * 256K SIMMS
	5 Meg			4 * 1M SIMMS
	8 Meg			8 * 1M SIMMS	4 * 256K SIMMS

	Note that all upgrades to the Mac II consist of adding either
4 or 8 SIMMS.  There is no other acceptable combination.  Also note that
the only reason I can think of to have 4 Meg is to put 4 Meg in one Mac II
and 2 Meg in another.

	No modification is needed beyond installing the appropriate
memory.  The largest parts must be installed farthest from the power
supply.

	All chips must be 120NS parts, while 150NS parts may work
they will eventually begin having problems in the most insidious ways.
DON'T USE 150NS PARTS WITH A MACINTOSH II!  All Apple upgrades contain
120NS parts and are therefore safe to use with a Macintosh II.  Before
you purchase a third-party upgrade make sure it contains 120NS parts.


	Macintosh SE and Plus

	Configuration		Add		Remove
	1 Meg			As Shipped
	2 Meg			2 * 1M SIMM	4 * 256K SIMM
	2.5 Meg			2 * 1M SIMM	2 * 256K SIMM
	4 Meg			4 * 1M SIMM	4 * 256K SIMM

	Once again, you have a configuration which doesn't make much
sense to have, the 2 Meg configuration means you have 2 256K SIMMs
sitting unused in your pocket, might as well leave them in the machine.

	In order to install 1 Meg SIMMS in an SE you remove/disconnect
the resistor marked 256K in the vicinity of SIMM#1.  If you wish to
remove all 1 Meg SIMMS from the machine you must reinstall it.  The
largest parts should be installed in SIMM #1 and SIMM #2.

	Chips may be either 120NS or 150NS.  Machines may be shipped
with either part.
-- 
	David W. Berry
	dwb@well.uucp                   dwb@Delphi
	dwb@apple.com                   973-5168@408.MaBell
Disclaimer: Apple doesn't even know I have an opinion and certainly
	wouldn't want if they did.

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!decwrl!nsc!voder!apple!dwb
From: dwb@apple.UUCP (David W. Berry)
Newsgroups: comp.sys.mac
Subject: Memory Upgrades
Message-ID: <6733@apple.UUCP>
Date: Fri, 13-Nov-87 19:55:47 EST
Article-I.D.: apple.6733
Posted: Fri Nov 13 19:55:47 1987
Date-Received: Sun, 15-Nov-87 16:11:20 EST
Reply-To: dwb@apple.UUCP (David W. Berry)
Organization: Apple Computer Inc., Cupertino, USA
Lines: 55
Keywords: The Final Word on Memory upgrades