Read this before you fatten your Mac

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Article #635

#635

From: W. Harry Plantinga
Date: Fri, 15 Feb 1985 22:29

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I've done the 512k upgrade from DDJ and I now have a fat mac for under $200.  

A couple of notes:

  -  The article has an error in it:  the text says to solder pin 7 of the
     74F253 to the IC below, and the picture says pin 8.  The picture is
     right.  (Applies only to the older board version.)

  -  74LS253 seems to work as a substitute for 74F253.

  -  The color code yellow-purple-brown on a resistor means 470 ohms,
     not 47 ohms, and 470-ohm resistors don't work nearly as well (I
     found this out the hard way).

				Harry Plantinga
				{seismo,allegra,inhp4}!uwvax!planting
				planting@wisc-rsch.arpa

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site uwvax.UUCP
Path: arc1-ca.pugleaf.net!utzoo!utcs!lsuc!pesnta!hplabs!hao!seismo!uwvax!planting
From: planting@uwvax.UUCP (W. Harry Plantinga)
Newsgroups: net.micro.mac
Subject: Read this before you fatten your Mac
Message-ID: <125@uwvax.UUCP>
Date: Fri, 15-Feb-85 17:29:49 EST
Article-I.D.: uwvax.125
Posted: Fri Feb 15 17:29:49 1985
Date-Received: Sun, 17-Feb-85 12:33:36 EST
Distribution: net
Organization: U of Wisconsin CS Dept
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