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From: garym@telesoft.UUCP (Gary Morris @shine)
Newsgroups: net.micro.mac
Subject: Re: Fat Mac request (512K)
Message-ID: <199@telesoft.UUCP>
Date: Fri, 20-Sep-85 01:08:16 EDT
Article-I.D.: telesoft.199
Posted: Fri Sep 20 01:08:16 1985
Date-Received: Wed, 25-Sep-85 10:19:43 EDT
References: <2017@amdahl.UUCP> <226@encore.UUCP>
Reply-To: garym@telesoft.UUCP (Gary Morris @shine)
Distribution: net
Organization: TeleSoft, SanDiego CA
Lines: 24
Keywords: fat, 512K, memory, upgrade
Summary: Magazine article references

In article <226@encore.UUCP> bartlett@encore.UUCP (John Bartlett) writes:
>Old request I'm sure, but I'm new.  A friend would like me to upgrade his
>Mac to 512K.  Please send any info you have.  I'm a hardware engineer, so
>technique is not needed, just procedure.

This is short so I'll post it for everyone.  Two articles that I know of
cover the upgrade.  Dr. Dobb's Journal, January 1985, Pgs 18-23 and pg 4.
Also there was an article in '68' Micro Journal (sorry I don't have the
date).  I've done four upgrades myself using the circuit from Dr. Dobb's
and the parts layout from '68' Micro Journal.  The circuits are almost
identical except for pull up resistors used in Dr. Dobb's.  I also used 
74LS253 (Dobb's says use 74F253N, Micro says 74LS253), and have had no 
problems.  It's definitely worth reading the article before attempting 
the job.

-- GaryM

[General disclaimer: This posting is in no way related to my employer.]

-- 
GARY A. MORRIS -- TeleSoft, San Diego, CA   (619) 457-2700
		  (UUCP) ...{decvax,ucbvax}!sdcsvax!telesoft!garym
"Always listen to experts.  They'll tell you what can't be done 
 and why.  Then do it."  	--  Lazarus Long