Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: 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 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.