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
Received on Mon Apr 19 1999 - 22:40:21 BST
