Hi Patrick
You might go with a larger 1Kx8 PROMs. I think these
are more easily found. You can waste the rest or add
jumpers to select options. It seems like I was able to
get some of these from Jameco or Anchor.
Just a though
Dwight
From: "Patrick Rigney"
<patrick(a)vintagecomputermarketplace.com>
I'm trying to find a couple of 256x8 PROMs (unprogrammed of course) for
replacements. The original part is an 82S135 (Phillips), but equivalents
are apparently: NEC uPB421; AMD/MMI 6309, 63S09, 6309-1, 63S281; Texas
Instruments 18S22 or 28L22. If anyone knows of a source for these, or has a
couple you are willing to part with, please contact me off list. So far
I've found a lot of sites advertising, but only one has actually had the
parts and I'm hoping to do better than nearly $16 each. --Patrick