Datanetics 01-02-638
Datanetics part no. 01-02-638 is a full-travel Datanetics batch-fabricated array keyboard. This particular example has serial number 0156 and was manufactured in December 1970, making it a fairly early keyboard for Datanetics. The photos below are from the now deleted eBay listing 333868304514 “Vintage Datanetics keyboard - 1970 w/ early TTL iC's”, posted by seller anifurdr of store DVQs vintage electronics.
This keyboard makes use of TTL encoding, with the following thirteen ICs being used:
| Part | Count | Function |
|---|---|---|
| MC8311P | 1 | One-of-sixteen decoder |
| MC7493P | 2 | 4-bit binary counter |
| SN74151N | 1 | 8-line to 1-line data selector/multiplexer |
| MC7405P | 1 | Hex inverter |
| MC7404P | 2 | Hex inverter |
| N7400A | 3 | Quad 2-input NAND gate |
| MC7410P | 1 | Triple 3-input NAND gate |
| MC7402P | 1 | Quad 2-input NOR gate |
| MC4008P | 1 | 8-bit parity tree |
Considering the presence of two binary counters, a multiplexer and a decoder, it seems highly likely that this is a matrix scanning keyboard. There does not seem to be a clock, however, and the CKA and CKB clock lines into the two counters cannot be traced. Possibly this keyboard required an external clock signal.
