Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!yale!mintaka!churchy.ai.mit.edu!dbert
From: dbert@churchy.ai.mit.edu (Douglas Siebert)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Identifying SIMMs
Message-ID: <1991Feb26.044609.1420@mintaka.lcs.mit.edu>
Date: 26 Feb 91 04:46:09 GMT
References: <1991Feb25.101258.21262@merrimack.edu>
Sender: daemon@mintaka.lcs.mit.edu (Lucifer Maleficius)
Organization: The Internet
Lines: 52

In article <1991Feb25.101258.21262@merrimack.edu> rand@merrimack.edu writes:
>Someone recently made a donation of some SIMMs I'd like to identify.
>They came in a box labelled "Multi-SIMMs Megabyte SIMM modules for the
>Macintosh Plus, SE, and II" from SiCLONE.
>
>In each box there are 4 SIMMs. I'm wondering if the person gave us the
>1/4MB SIMMs he replaced or really gave us 1MB SIMMs. Here are the
>markings on the SIMMs:
>
>First set:
>Back:
>
>NEC MC-41256a8b-12
>8828me
>
>Front of the 8 chips:
>
>NEC
>d41256-12
>8825eea33
>
>Second set:
>Back:
>
>PG Design Electronics
>
>Front of the 8 chips (markedly larger than the first set)
>
>km41c1000j-12
>815 korea
>
>
>Do I have the real McCoy or the old McCoy?
>
>thanks

Sorry, you have the old McCoy.  The 41256 means 256Kbits are in each chip
(x8 chips = 256K bytes of course)  Perhaps someone else out there could
answer a question I have now....is the -12 after that an indication of speed?
If so, in what way>  Does the 12 mean 120ns?  Or does it mean it'll work
on machines with speeds of under 12MHz?  Or is it unrelated to this?
 
And on a related note, how does processor speed relate with memory speed?
I know that faster processors need faster memory, but is there a formula you
can use where you can take one variable and determine the boundaries on the
other?  Thanks.

--
________________________________________________________________________
Doug Siebert                                     dbert@albert.ai.mit.edu
MBA Student (2nd year)
The University of Iowa