Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!usc!ucsd!helios.ee.lbl.gov!pasteur!cory.Berkeley.EDU!mkao
From: mkao@cory.Berkeley.EDU (Mike "Butterball" Kao)
Newsgroups: comp.sys.mac
Subject: Memory compatibilities between old/new Macs
Summary: Does the parity bit render "old" SIMM's incompatible?
Message-ID: <22977@pasteur.Berkeley.EDU>
Date: 13 Mar 90 05:03:31 GMT
References: <14624.25FC7443@stjhmc.fidonet.org>
Sender: news@pasteur.Berkeley.EDU
Reply-To: mkao@cory.Berkeley.EDU.UUCP (Mike "Butterball" Kao)
Organization: University of California, Berkeley
Lines: 14


I learned from my digital design professor that the newest Macs (beginning
witht he IIci I think) have added a parity bit to each byte, now resulting
in 9-bit bytes. I suppose this means that these Macs use 9-bit SIMM's?

I want to know because I currently own a Mac II with 4 MB and am considering
buying 4 more MB to bring my machine up to the max; however, I am concerned
that, should I decide to upgrade to one of these newer Macs, all my SIMM's
will be useless. Is this true?

--------------------------------------------------------------------------
PLEASE reply via E-MAIL to insure my receipt of any replies. Thank you!!!!
FINALLY! A permanent address........................mkao@cory.berkeley.edu
------------------------------Pi Kapp, Gamma------------------------------