Hi, all, In a group of PDP8 stuff that I recently got, I got a board that I can't identify. It is most definitely not a DEC-made board, likely made by some third party. It has no identification as to function or manufacturer anywhere on it, except for stamped-on ?part number?: "303 0115 001". It is a double-sided board, with all TTL logic. Date codes on the IC's range from late 1971 through mid-1973. The IC's are mostly 7400-series small-scale devices, IE: 7410, 7404, 7400, 7474. There are also some Signetics-made IC's that have part numbers of the form SPxxx, IE: SP384A, SP380A, SP314A. There are also some other 16-pin DIP IC's (Signetics and another manufacturer whose logo I don't recognize) that have part numbers such as "N8251", "N8235", "N8256". There is a stamped on code on the back (solder) side of the board that says "7524" -- perhaps a date code? The board has NO jumpers or settings that I can find. It has no 'top' connectors, so it doesn't interconnect with other boards, and there's no cable connectors or anything like that on it. The 'extractor' handles are white (two of 'em), and have no nomenclature on them. It doesn't seem complex enough to have much functionality, and it's definitely not some kind of I/O board, as there are no ins or outs other than the OMNIBUS. There's a photo of it (large, around 460K, so there's good detail) available at the following URL: http://www.geocities.com/SiliconValley/Lab/7510/decboard.jpg Anyone have any ideas as to what this thing might do? Rick Bensene The Old Calculators Web Museum http://www.geocities.com/SiliconValley/Lab/7510