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From: info-mac@uw-beaver (info-mac)
Newsgroups: fa.info-mac
Subject: Upgrading your own MAC memory
Message-ID: <1253@uw-beaver>
Date: Wed, 18-Jul-84 20:11:42 EDT
Article-I.D.: uw-beaver>.1253
Posted: Wed Jul 18 20:11:42 1984
Date-Received: Thu, 19-Jul-84 04:59:49 EDT
Sender: daemon@uw-beave
Organization: U of Washington Computer Science
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From: Dennis.Griesser@HIS-LA-CP6.ARPA
Will it work?  A previous transaction by Kevin <Mackey.PA@PARC-MAXC.ARPA>
(dated 2/10/84) gave a summary of a talk by Dan Kottke, an Apple engineer.
Among other things, he said:
  o It's very easy to put 256K chips in.
  o He expects several magazines to show everyone how to do it.
  o The PC board has 4 layers.

No mention was made of other changes required to expand memory.  I do
remember a quote from somewhere (a magazine quoting Jobs?) that said
NO other changes are required.

If you go to the trouble of removing the RAMs, you might as well
install sockets for them.  Get good quality ones, don't skimp.

How do you pull the old RAMs?  Use the method that YOU have the most
confidence in.  I have tried squeeze bulbs, spring-loaded pumps,
solder-wick, and fancy desoldering stations.  I've tried to save the
old chips, and I've tried sacrificing them.  The thing that worked
best for me, with least damage to the PC board was solder wick.  No
kidding!

When considering whether or not to sacrifice old chips, consider
the possible gains and losses.  For the MAC, that means:
   Approximate cost of Mac................$2500
   Approximate cost of new chips..........$1700
   Approximate if-new cost of old chips....$100
The the old chips are only about 2% of your total investment.  You
could not sell them for anything near the if-new cost, but might find
some project to put them in.  I don't think it is worth risking the
main MAC board to save such a small amount.

New question:  an equivalent amount of memory using 64K chips would
cost around $300.  How hard would it be to add three banks of cheap
chips and save $1400 on the expansion?