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From: philip@Kermit.Stanford.EDU (Philip Machanick)
Newsgroups: comp.sys.mac.misc
Subject: Re: 256K SIMMS and the IIcx
Message-ID: <1990Jun5.202937.19854@Neon.Stanford.EDU>
Date: 5 Jun 90 20:29:37 GMT
References: <1990Jun5.162020.19019@agate.berkeley.edu> <15137@dime.cs.umass.edu>
Sender: news@Neon.Stanford.EDU (USENET News System)
Reply-To: philip@pescadero.stanford.edu
Organization: Computer Science Department, Stanford University
Lines: 31

In article <1990Jun5.162020.19019@agate.berkeley.edu>,
dankg@volcano.Berkeley.EDU (Dan KoGai) writes:
> In article <15137@dime.cs.umass.edu> roskill@cs.umass.edu writes:
> >
> >Hi,
> >
> >I know I've talked about this subject before, but I want to
> >expand my father's IIcx by adding 4 256K SIMMS.  Is there
> >anything special about the 256K SIMMS used in the IIcx?
> >
> >If they are nothing special, then I'm in the market for 4
> >256K SIMMS....I'll pay shipping and some amount for each
> >SIMM.  Make me an offer and get rid of those refrid magnets.
> 
> 	The only checkpoint for IIci or down is access speed.  In your
> case, that's no problem as long as access speed is faster than 120ns.
> Here's the minimum access speed list for IIci and down
> 
> Plus|SE		150ns
> II|IIx|IIcx	120ns
> IIci		80ns
> 
> 	IIfx is special, for it uses special 64-pin simm to acceralate
> write speed.  Hope it helps.
Yes - here's another question. The 1M version of the IIci is equipped
with 256K SIMMs with fewer RAM chips (2 per SIMM, I think - i.e., 4-bit
wide chips instead of 1-bit wide). Is there any problem using these IIci
256K SIMMs on other models?

Philip Machanick
philip@pescadero.stanford.edu