I found this type SFI-534 card in an IBM 5155 I recently bought. No software for it was on the 5155's hard drive (21mb Seagate). What is intriguing is what is on this board: MC6809P (socketed) MC6850P MC6840P MC6854P HY6264P-10 (x2) HD46504P/HD6844P AM2130-12PC (socketed) 27264-25 EPROM (socketed) DB9M and DB9F The board is switch selectable to be addressed anywhere from CA000-CA3FF through D3000-D33FF. It looks like it can be a lot of fun to play with if I can find any information (I.E. Schematics, etc.). From what I've found out so far, this board uses RS-422 for communication. All the receivers/drivers and protection circuitry is under the metal cover. Anyone know anything about this board? There's one very similar to it on eBay now: http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=381126929 ,with photo. I put a $0.01 bid on it just so I can easily track the action, so if anyone else wants one of these boards, feel free to bid on it also. I have no desire, yet, to own another one. Bill ************************************************************** Bill Dawson <mailto:whdawson*at*mlynk.com> <- Anti-spam protection ? Your computer will do far more than you ever expected it to, and that won't be enough. Pournelle's First Law