planting@uwvax.UUCP (W. Harry Plantinga) (02/16/85)
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