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From: tgoose@eng.umd.edu (Jason Garms)
Newsgroups: comp.sys.mac.hardware
Subject: Re: The LC vs. IIsi (LONG)
Message-ID: <1991Jun12.004120.19934@eng.umd.edu>
Date: 12 Jun 91 00:41:20 GMT
References: <1991Jun5.175401.14345@sequent.com> <1991Jun7.192453.11305@dartvax.dartmouth.edu> <1991Jun7.214930.9822@midway.uchicago.edu> <1991Jun11.114430.6225@rodan.acs.syr.edu>
Sender: news@eng.umd.edu (C-News)
Reply-To: tgoose@eng.umd.edu (Jason Garms)
Organization: College of Engineering, Maryversity of Uniland, College Park
Lines: 42

In article <1991Jun11.114430.6225@rodan.acs.syr.edu>, dinapoli@rodan.acs.syr.edu (Ron DiNapoli) writes:
> In article <1991Jun7.214930.9822@midway.uchicago.edu> jcav@quads.uchicago.edu (john  cavallino) writes:
> >In article <1991Jun7.192453.11305@dartvax.dartmouth.edu> Brian.V.Hughes@dartmouth.edu (Brian V. Hughes) writes:
> >>In article <1991Jun5.175401.14345@sequent.com>
> >>lff@sequent.com (Lou Fernandez) writes:
> >>    In terms of speed requirements, I wouldn't put anything slower that
> >>80 Ns in any of the  newer Macs.
> >
> >The Apple specs say that the LC needs 120ns and the IIsi needs 100ns.
> >
> 
> The LC needs 100ns or faster SIMMs.  This is clearly documented in Technical 
> Note #176 "Macintosh Memory Configurations" on page 6.  On the upper left 
> hand corner of the page there is a picture of the LC motherboard showing the
> location of the SIMMs slots.  The caption reads
> 
> 	Macintosh LC
> (RAM SIMMs must be 100nS RAS-access time or faster)
> 
> This is stated again on page 7 under the heading of "Macintosh LC"
> 
> --Ron D.

This back and forth stream intrigues me because it is fully likely that Apple
has made both claims in different advertisements.  They are well known for this.
I don't think it is really worth arguing about.  I can tell you however, that
I have put 120ns SIMMs into many Mac LC's and have never seen any problems.

However unless you already have the SIMMs this should not be an issue because
many places would charge you more for 120 (or even 100ns) SIMMs than 80ns.
This is because the 80ns are available in higher quantity.

Jason Garms
tgoose@eng.umd.edu

PS. Interesting footnote.  In Apple's repair manual which they give to Apple
Authorized repair centers, the CPU in the Mac IIfx is listed as a 33MHz 68030.
This is understandable because that is what was orignally going to be used.
It is still funny that Apple shipped these repair guides with that mistake in
them.

Have a good day!!