IBM TPC Keyboard IV
Provided by the ASK Keyboard Directory
eg, P/N 4010504
IBM-made 84-key keyboard for the IBM 4459 TEMPEST PC IV (aka, TPC IV or TPC4), a TEMPESTed version of the IBM 5170 Personal Computer AT. This keyboard is a TEMPESTed version of the IBM Personal Computer AT Keyboard. Its controller electronics are shielded and it uses a male DE-9 plug instead of a 5-pin DIN plug.