Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!tut.cis.ohio-state.edu!uc!cs.umn.edu!ux.acs!clarson From: clarson@ux.acs.umn.edu (Chaz Larson) Newsgroups: comp.sys.mac.misc Subject: Re: SE/30 + SIMM problem Message-ID: <1966@ux.acs.umn.edu> Date: 6 Aug 90 19:30:59 GMT References: <1668@idunno.Princeton.EDU> Reply-To: clarson@ux.acs.umn.edu (Chaz Larson) Organization: Iron City, USA Lines: 50 In article <1668@idunno.Princeton.EDU> fmidgley@phoenix.Princeton.EDU (Frank Murray Midgley) writes: > > This weekend, I attempted to upgrade my Mac SE/30 to 2.5M. I got >the casing open and the logic board removed with no trouble. The first two >SIMM slots had four 256K boards in them, as it should. I inserted the two >new boards into the third SIMM slot. When I closed up the case and restarted >the Mac, I got the sad mac sound, along with a strange checkerboard pattern >on the screen. I then tried placing one board in the third slot, and the >second board in the fourth slot. Same reaction from the computer. When I >removed the new boards, it went back to normal. Am I doing this totally >wrong? I was grounded the whole time by a wrist tap, so I don't think I >damaged the boards or the Mac. Any advice would be appreciated. The problem is that a Mac SE/30 cannot be upgraded to 2.5 megs. WRT memory upgrades, an SE/30 is the same as the II family, to wit: There are two banks of four slots each. A bank must be _completely full_ with SIMMs of the same size. So, the available memory configurations are: Bank: A B Total RAM: SIMM Size: 4 * 256K [empty] 1 megabyte [standard config] 4 * 256K 4 * 256K 2 megabytes 4 * 1meg [empty] 4 megabytes 4 * 1meg 4 * 256K 5 megabytes 4 * 1meg 4 * 1meg 8 megabytes --------------------------------------The below for System 7.0 only... 4 * 4meg [empty] 16 megabytes 4 * 4meg 4 * 256K 17 megabytes 4 * 4meg 4 * 1meg 20 megabytes 4 * 4meg 4 * 4meg 32 megabytes So, the long and short is that you'll have to buy another pair of SIMMs, so that you can fill both banks completely. Move the 256K SIMMs to Bank B, and install the four 1meg SIMMs into Bank A. That's all there is to it. Apple Tech Note #176 describes Mac Memory Configurations in great detail. If you want a copy, let me know and I can mail you one. Hope this helps you out. -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ "Must think...bubble pipe will relax me and I think..." - Flaming Carrot clarson@ux.acs.umn.edu AOL:Crowbone