Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!sdd.hp.com!ucsd!ucbvax!bloom-beacon!eru!hagbard!sunic!news.funet.fi!assari.tut.fi!assari.tut.fi!n67786 From: n67786@lehtori.tut.fi (Nieminen Tero) Newsgroups: comp.sys.mac.hardware Subject: Re: SIMMs for IIsi - what do I need? Message-ID: Date: 17 Dec 90 11:32:24 GMT References: <1CE00001.0b2um2@tbomb.ice.com> Sender: news@assari.tut.fi (USENET News System) Organization: Tampere Univ. of Technology, Finland. Lines: 25 In-Reply-To: time@tbomb.ice.com's message of 17 Dec 90 12:15:58 GMT > Thank you. I have nothing against putting faster chips in a machine > when there are chips already in the machine that are slower. As long > as they all meet the required speed or faster this is acceptable. This is not exactly true now is it? I just went to move some 80ns SIMMs from my IIfx into my IIx. Guess What? They do not fit. Sockets are different sizes. Am I missing something here? Different speed SIMMs have different socket dimensions, right? Just the fact that fx RAMs are so called dual port rams. Dual port RAMs are only used in Mac fx, so it won't make much of a hassle (at least at the time being). For the curious and technically minded: dualport RAMs are such that provided certain conditions are met dualport rams can be written to and read from at the same time. The larger sockets are needed for this kinds of RAMs to operate. tim. -- Tero Nieminen Tampere University of Technology n67786@cc.tut.fi Tampere, Finland, Europe