Article View: comp.sys.mac
Article #20538Re: 120ns vs 150ns SIMMs?
From: J.S.Shapiro
Date: Tue, 20 Oct 1987 04:15
Date: Tue, 20 Oct 1987 04:15
28 lines
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1382 bytes
In article <162@PT.CS.CMU.EDU>, fryd@G.GP.CS.CMU.EDU.UUCP writes: > Is it possible to tell by human inspection if a SIMM is 120ns or 150ns? > > I have heard that the MAC II requires 120ns memory. It does require 120ns SIMMs. > The chips on the 256k SIMMs have the following numbers > on them: > NEC Japan > 8707EK06 > 41256-15 > > Does the "-15" mean that these are 150ns parts? Sorry Michael. You have 150ns parts. In general the number you want is the 41256-xx number. This number describes both the layout of the ram (i.e. 256k x 1 vs 64k x 4) and the speed. The numbers will typically trail off with the two xx digits being one of the following: -10 100 ns parts -12 120 ns parts -15 150 ns parts I do not know what is done for faster RAMs. Jon Shapiro AT&T
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arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!sundc!sun!amdcad!ames!hc!beta!cmcl2!rutgers!bellcore!faline!ulysses!sfmag!sfsup!shapReferences:
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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!sundc!sun!amdcad!ames!hc!beta!cmcl2!rutgers!bellcore!faline!ulysses!sfmag!sfsup!shap From: shap@sfsup.UUCP (J.S.Shapiro) Newsgroups: comp.sys.mac Subject: Re: 120ns vs 150ns SIMMs? Message-ID: <2223@sfsup.UUCP> Date: Tue, 20-Oct-87 00:15:58 EDT Article-I.D.: sfsup.2223 Posted: Tue Oct 20 00:15:58 1987 Date-Received: Wed, 21-Oct-87 07:14:50 EDT References: <162@PT.CS.CMU.EDU> Organization: AT&T-IS, Summit N.J. USA Lines: 28 Summary: How to tell speeds of SIMMs