Article View: comp.sys.mac
Article #18270Re: Can Sell old SIMMS to II owner?
From: ephraim
Date: Wed, 19 Aug 1987 12:43
Date: Wed, 19 Aug 1987 12:43
22 lines
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1498 bytes
In article <334@ge-mc3i.UUCP>, sterritt@ge-mc3i.UUCP (Chris Sterritt) writes: > a friend of mine just got a Mac II, with only a Meg. My question is, can > I sell him the two 256K simms (since they'll at least fit in his machine) > to upgrade him to 1.5 megs? > Has anyone *done* this, or *know* of a reason why it won't work? According to anything I've seen about upgrading the II's memory, the supported memory sizes are 1, 2, 4, 5, and 8 megabytes. The reason is that SIMMs are 8 bits wide and the Mac II data path is 32 bits wide. So, SIMMs must be installed in groups of four. You can have 4 256K SIMMs (1 Meg), 8 256K SIMMs (2 Meg), 4 1M SIMMs (4 Meg), 4 1M + 4 256K (5 Meg), or 8 1M (8 Meg). You can't have 6 256K SIMMs (1.5 Meg). In fact, you can't have any combination totalling 1, 2, 3, 5, 6, or 7 SIMMs, nor can you have any mixture except 4 and 4. -- Ephraim Vishniac masscomp!wang7!ephraim
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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!rutgers!clyde!masscomp!wang7!ephraim From: ephraim@wang7.UUCP (ephraim) Newsgroups: comp.sys.mac Subject: Re: Can Sell old SIMMS to II owner? Message-ID: <135@wang7.UUCP> Date: Wed, 19-Aug-87 08:43:52 EDT Article-I.D.: wang7.135 Posted: Wed Aug 19 08:43:52 1987 Date-Received: Sat, 22-Aug-87 07:31:40 EDT References: <334@ge-mc3i.UUCP> Organization: Wang Laboratories, Lowell, MA, USA Lines: 22 Keywords: SIMMS, 256k, MacII Summary: 6 SIMMs is not a choice