Re: Parity vs. non-Parity RAM in the Mac IIci

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Article #4996

#4996

From: Alex Lau
Date: Thu, 21 Sep 1989 22:37

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In article <0xe23@deimos.cis.ksu.edu> paryavi@harris.cis.ksu.edu (Saiid Paryavi) writes:
>Does anyone know what the difference between parity and non-parity RAM is in
>the Mac IIci?  Does it have to do with the speed of the RAM?  Does one type
>run faster than the other or is it that one is more reliable???

As I understand it, parity-checking RAM runs an error check while
non-parity-checking RAM doesn't. Parity-checking RAM is a mite
slower and slightly more expensive, although the MS-DOS market is
full of parity-checking RAM machines so the demand is higher and
sometimes the prices are actually lower for the RAM itself.

Also as I understand it, Apple included an option for parity-checking
RAM in the IIci because many major corporations and certain divisions
of the government require it. Apple had a tech note (I forget which
number) explaining why they didn't use parity-checking; I guess that
will soon be updated...

>Saiid Paryavi                      			Computer Science Dept.	

--- Alex
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!watmath!att!tut.cis.ohio-state.edu!ucbvax!pasteur!franny.Berkeley.EDU!c8s-an
From: c8s-an@franny.Berkeley.EDU (Alex Lau)
Newsgroups: comp.sys.mac
Subject: Re: Parity vs. non-Parity RAM in the Mac IIci
Message-ID: <17475@pasteur.Berkeley.EDU>
Date: 21 Sep 89 22:37:21 GMT
References: <0xe23@deimos.cis.ksu.edu>
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