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From: fryd@G.GP.CS.CMU.EDU (Michael Fryd)
Newsgroups: comp.sys.mac
Subject: 120ns vs 150ns SIMMs?
Message-ID: <162@PT.CS.CMU.EDU>
Date: Tue, 13-Oct-87 10:39:58 EDT
Article-I.D.: PT.162
Posted: Tue Oct 13 10:39:58 1987
Date-Received: Thu, 15-Oct-87 01:06:04 EDT
Sender: netnews@PT.CS.CMU.EDU
Organization: Carnegie-Mellon University, CS/RI
Lines: 23
Keywords: SIMMs

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.
I have also heard that some 256k SIMMs are 120ns and some
are 150ns.   How do I tell
from looking at a SIMM if it is suitable for a MAC II?

In particular, I have some 256k SIMMs that came out of
a MAC SE when it was upgraded with 1 meg 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?
I had heard that all MAC SEs came were supposed
to come with 120ns parts?

		- Thanks for any advice.
		  Michael Fryd

Michael.Fryd@cs.cmu.edu