Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!shelby!polya!kaufman
From: kaufman@polya.Stanford.EDU (Marc T. Kaufman)
Newsgroups: comp.sys.mac
Subject: Re: Memory for LaserWriter II/ntx...?
Message-ID: <8444@polya.Stanford.EDU>
Date: 14 Apr 89 02:58:33 GMT
References: <3953@ucdavis.ucdavis.edu>
Sender: Marc T. Kaufman <kaufman@polya.Stanford.EDU>
Reply-To: kaufman@polya.Stanford.EDU (Marc T. Kaufman)
Distribution: usa
Organization: Stanford University
Lines: 10

In article <3953@ucdavis.ucdavis.edu> lgdemichillie@ucdavis.edu (Greg DeMichillie) writes:

>Yes indeed, the SIMMS for the LaserWriter are NOT the same as the SIMMS for
>regular Mac memory.  Why?  I don't have the faintest idea.

The Laserwriter SIMMs have a separate enable line for each bit, so that an
'OR' to memory operation can be performed by writing 1 bits, without the
need to read the location first.  It's faster that way.

Marc Kaufman (kaufman@polya.stanford.edu)