Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!apple!voder!nsc!amdahl!JUTS!duts!kls30 From: kls30@duts.ccc.amdahl.com (Kent L Shephard) Newsgroups: comp.sys.next Subject: Re: SIMM Message-ID: <28p402vw08py01@JUTS.ccc.amdahl.com> Date: 5 Jun 91 16:29:36 GMT References: <1991Jun1.091010.509@cube.han.de> Sender: netnews@ccc.amdahl.com Reply-To: kls30@DUTS.ccc.amdahl.com (Kent L. Shephard) Organization: Amdahl Corporation, Sunnyvale CA Lines: 36 In article <1991Jun1.091010.509@cube.han.de> martin@cube.han.de (Martin Ortlepp) writes: >In article cnh5730@maraba.tamu.edu >(Charles Herrick) writes: > >> The SIMMS RAM chips shipped in your machine are 1X8 (i.e. non-parity >> RAM). >> You can not mix (1X8) with (1X9). >> The 70ns should work, but your RAM needs to be non-parity if you are >> going to use the RAM NeXT put in your cube. > >Thanx for your answer. Hmm, in QA 620 it's said that one can mix parity and >non-parity RAM. The problem ist that a 040 machine with mixed parity and >non-parity won't boot automatically. However, my machine doesn't work with ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This is not true. My '040 cube boots automatically from the scsi disk w/out having to go to the ROM monitor. The first time it did not. But after I disabled parity and rebooted it did. Like I said before parity should go into the first banks with non parity going in last. This is the way I configured my machine and the only way it would boot without problems. >these SIMM's. I'll try 1x8 Mac style SIMM's, let's hope that they'll work.. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The 1X9 simms you have should work. The only difference between a 1X9 and 1X8 is the extra chip the boards themselves are the same. > >-Martin >martin@cube.han.de -- /* -The opinions expressed are my own, not my employers. */ /* For I can only express my own opinions. */ /* */ /* Kent L. Shephard : email - kls30@DUTS.ccc.amdahl.com */