This particular case might be just a bit more involved, since pin numbers are more difficult for the unititiated to track between the 44-pin PLCC and the 40-pin DIP. However, it really doesn't require one be a rocket scientist to figure it out. Like many other tasks it requires attention to detail. The original inquiry came from someone wishing, probably more than anything else, to read the contents of his EPROMs without risking damaging them. It's really not likely that will happen so long as power and ground are connected to the right pins. An additional risk might be that data outputs might be shorted to one or another of the rails. If one is careful enough to avoid those bugaboos, reading the things will be no problem. In fact, I'd recommend one attempt to do this via the EPP port. BTW . . . If your printer port is situated at the usual 0x378, then an outputb to 0x37B will generate a write to the data port (same pins as at 0x378) acocmpanied by an "address strobe" as part of the EPP standard interlocked hardware-handshake. An outportB to 0x37C will generate a "data strobe" in the same manner, requiring of course, that one interpret these correctly and respond with the appropriate "wait" pulse on what would otherwise be the "busy" pin. I'm not "up" on the Pentium instruciton set to such extent that I can guarantee that if one writes a WORD to the odd-addressed 0x37B location it will write the bytes to the two sequentially adjacent locations, but I would anticipate that if one writes a long word (32-bits) to 0x37C, most EPP hardware will transfer the bytes low==>high in order, via the data pins, and acocmpany each byte with a data handshake. That would certainly make it easy to read from a PLCC socket. Dick -----Original Message----- From: Tony Duell <ard(a)p850ug1.demon.co.uk> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Tuesday, October 05, 1999 12:34 PM Subject: Re: Help wanted in dumping EPROMs