Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!asuvax!ncar!midway!quads.uchicago.edu!ogil From: ogil@quads.uchicago.edu (Brian W. Ogilvie) Newsgroups: comp.sys.mac.hardware Subject: Re: Memory upgrade for Mac Plus Keywords: references wanted Message-ID: <1990Oct15.024301.28929@midway.uchicago.edu> Date: 15 Oct 90 02:43:01 GMT References: <1990Oct14.171754.5378@rodan.acs.syr.edu> Sender: news@midway.uchicago.edu (News Administrator) Organization: Bill's Donut Emporium Lines: 26 In article <1990Oct14.171754.5378@rodan.acs.syr.edu> amichiel@rodan.acs.syr.edu (Allen J Michielsen) writes: >In article masticol@lento.rutger >>Does anyone have a reference (in one of the Mac magazines or books, >>perhaps) on how to upgrade the memory of a Plus? I need to know both >>the procedure and what type of SIMMs to buy. > > I don't have a ref., but it's pretty easy. [...] Mr. Michielsen left out one important point in his description of how to upgrade the RAM in a Mac Plus. There is a resistor somewhere on the motherboard (if the SIMM sockets are on the bottom, relative to you, it's in the upper left part, I think) labeled "256 KB" which you must cut if you want to upgrade the memory. Otherwise BAD THINGS (TM) will happen. The details of installing SIMMs in all current Apple computers which use them are given in Tech Note #176, "Installing SIMMs." I used to forget to cut this resistor about one in four times when I upgraded Mac Pluses. The result, when there are four 1 Mb SIMMS in the Mac, is that it thinks there are only two. Not as neat as what happens if you install 2 256 Kb and 2 1 Mb SIMMS in the wrong banks, but sort of interesting, especially if a customer is watching you do this to his machine (now wait just a minute, nothing to panic about...) -- Brian W. Ogilvie "Find a need and fool it!" ogil@midway.uchicago.edu --Zippy the Pinhead