Read this before you fatten your Mac

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1 total messages Started by W. Harry Plantinga Fri, 15 Feb 1985 22:29

#635

Author: 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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