Datanetics 01-02-371B

01-02-371B is an early Datanetics batch-fabricated array keyboard, manufactured in June 1970 and discovered in 2021 by Reddit user SomewhatBeck. The encoding in this model is provided using a diode matrix; the same year would see model 01-02-638 with TTL matrix scan encoding, and 1971 would see DC900-0067-1 with a MOS/LSI single-chip encoder.

The encoder is diode–transistor logic (DTL) rather than the later TTL (transistor–transistor logic), and uses the following chips:

Part	Quantity	Function
DM8220N	1	Parity checker and generator
DM935N/MC840P	2	Hex inverter (without input diodes)
DM936N/MC836P	4	Hex inverter
DM946N/MC846P	4	Quad 2-input NAND gate

The keyboard has three printed circuit boards: one for the membrane–PCB switch assembly, one for the encoder, and one that connects the switch and encoder PCBs together. The switch and encoder PCBs each have edge connectors, and the third PCB, which is mounted vertically, bears a pair of edge connector sockets that press onto the two main circuit boards. This is instead of the more usual ribbon cable or discrete wiring more commonly seen in keyboards of the day.

The keyboard is fitted with a 15-pin D-subminiature plug, model DAM-15P.

The serial number is 1856, and the customer part number is 715541 D.

The photos below were provided by and the copyright of the keyboard’s owner (SomewhatBeck) and are used with permission.