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From: ix408@sdcc6.UUCP (Cris Rys)
Newsgroups: net.micro.mac
Subject: shelf done 512k upgrade + others
Message-ID: <1881@sdcc6.UUCP>
Date: Wed, 23-Jan-85 20:59:09 EST
Article-I.D.: sdcc6.1881
Posted: Wed Jan 23 20:59:09 1985
Date-Received: Fri, 25-Jan-85 21:34:56 EST
Organization: U.C. San Diego, Academic Computer Center
Lines: 29


Hi everyone,
	Well for those of you that are interested, I completed the
upgrade described in the Doctor Dobbs Journal (January). I had a few
problems, nothing fatal, just a few patches I forgot to make, but it
all came out great! It was a lot easier than I though it was, but
more tedious. For those of you still interested in the upgrade there
are three options that you may go:
1. Get upgrade from Apple for $600 ( they just lowered there prices)
   safest, yet most expensive.
2. Buy chips cheap, then send them with logic board to Masstech
   this would cost about $215 dollars for the chips + $150 dollars
   for Masstech assembly. I would have done this, and I recomend
   them, I have not heard anything bad about them.
3. Buy chips cheap, install them yourself about ($220)+ time.
   Safe if you know what you are doing, for me it was a first
   project (really!), Only problem is finding the 74AS253 chip.
   I used a 74LS253 and it is working fine. If anyone wants more
   information on this method you can write me. Something may be
   arranged with SD mac users to do a group upgrade together.
The cheapest place to get the 256k chips is Microprocessors
Unlimited. Here are the addresses of Masstech and Microprocessors Unlimited:
Masstech Developement Labs		Microprocessors Unlimited
451 Boston Road				24000 S. Peoria Ave.
Groton, Mass 01450			Beggs, OK 74421
(617)-448-3450				(918) 267-4961

bye
Cris Rys