I'd just like to make an update for all who may be interested in that potential PET to S100 bus device that I had sitting in storage. I pulled it out tonight instead of studying for exams, and it is indeed what was suspected. The "motherboard" (if that is the correct term) is a Vector Graphic Inc. S100 bus board. The RAM board that was being used for the PET, is a Vector Graphic Inc. 16K Static RAM board with a date of 1977 on it. The power supply says "KIMSI-PLUS Power Supply" on the back, 1977 from Forethought Products. This is all very wild, because I had no idea there was S100 stuff in this house. Anyway, the really interesting piece of circuitry is the PET to S100 interface board. It's the same size as the RAM board, and of course plugs into the S100 bus. At the top of the board is a 50-pin connector that plugs into a cable, that in turn plugs into the side memory expansion connector on the PET 2001. In white lettering, it says .----------. |_| | | |_|| | | |_| | || (<-- my cheezy attempt at duplicating the company .----------' logo with ASCII, it's HUH surrounded by a question .ELECTRONICS mark.) S100 MPA and etched into the board it says "COPYRIGHT 1978 BY HUH" and "S100 MPA REV A". The board isn't very heavily populated, compared to the RAM board, and most of the chips are 74LSxx chips. Anyone out there know more than I do about this thing? Doug Spence ds_spenc(a)alcor.concordia.ca