EPROM Question

Zane H. Healy wrote: :-) On a related note, is there such a thing as a homebrewed cross-reference showing which EPROMS can be treated as the 'same' from a programming point of view? For instance, my programmer knows nothing of Mitsubishi EPROMs, but does acknowledge many other manufacturers. I had no luck earlier trying to program a Mitsubishi 27218 part as an AMD EPROM of equivalent size, but it worked fine by telling the programmer that it was an Intel 27128 - presumably the timings vary slightly between manufacturers, but it's often possible to find something that's "close enough". (If anyone else has an old Elan universe-series EPROM / PAL programmer, shout. I'd be interested to know if you have programming cartridges that are different to mine) cheers Jules