This board converts parallel data from a PDP-8 into the serial data stream for a Teletype. It is similar to the transmit portion of a UART. This card and the W707 are the only PDP-8 cards I know of which uses RTL chips. Transistor Transistor Logic ( TTL ) chips where introduced a couple years after RTL chips and had better performance and soon became the dominant chip type. Soldered jumper wires near the top of the card selects between 5 and 8 bit characters and 1, 1.5, or 2 stop bits. This card is old enough that it uses soldered rivets to connect the top and bottom traces instead of plated through holes. The W707 supports up to 200,000 baud.
This board cost $150 in 1968.
Back of board (319K)
W series logic information
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