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 ( 86K) shows the later style with pads only where IC's or other components are installed.
This board cost $150 in 1970.
Feel free to contact me, David Gesswein email@example.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.
PDP-8 Home Page  PDP-8 Site Map  PDP-8 Site Search