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