Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!ucsd!sdcc6!sdacs!david
From: david@sdacs.ucsd.EDU (Dave the Hirko)
Newsgroups: comp.sys.mac
Subject: Re: SIMM pricing
Summary: what the ninth SIMM really is....
Message-ID: <101@sdacs.ucsd.EDU>
Date: 21 Jun 89 16:04:00 GMT
References: <138@nisca.ircc.ohio-state.edu> <1072@starfish.Convergent.COM>
Distribution: comp.sys.mac
Organization: University of California, San Diego
Lines: 18


much discussion has gone on about the difference between the 9 module
PC SIMM and the 8 module Mac SIMM.  This ninth module has to do with
the PC's approach to memory.  Consider for every 8 bits of memory, the
PC needs a ninth 'parity' bit to fool around with.  The Macintosh was
not set up the same way.  Therefore, without any guarantees (although
I have two 9 module SIMMs in my Mac), Macs can go about ignoring the
extra bit and still function properly.


David A. Hirko 
Academic Computing Services
University of California, San Diego
DISCLAIMER (from Hell) : My views are mine.  All mine.  Just Mine. 

DB: "I'm going to put Oscar down now."
PV: "No, let me do that for you.... You're short, your bellybutton
	sticks out too far, and you're a horrible burden on your mother."