This board is a Teletype transmitter board. It performed the parallel to serial conversion for a serial interface to a terminal. It required a W076 to convert the TTL outputs to Teletype 20ma current loop. This board is an early version, the blue IC's are only seen on a few early board and have date codes of 1968. The board also had a regular pattern of pads over the entire board with track leadouts to connect traces to. This was probably to make the early hand layout easier. The M700 timing generator (205K) shows the later style with pads only where IC's or other components are installed.
This board cost $150 in 1970.
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Feel free to contact me, David Gesswein djg@pdp8online.com with any questions, comments on the web site, or if you have related equipment, documentation, software etc. you are willing to part with. I am interested in anything PDP-8 related, computers, peripherals used with them, DEC or third party, or documentation.
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