A DEC PDP-10 / DECSYSTEM-10, the machine Creeper ran on

1971

Creeper was written by Bob Thomas at BBN in 1971 for the TENEX operating system running on DEC PDP-10 hardware, printing 'I'M THE CREEPER: CATCH ME IF YOU CAN'. This is a preserved DECSYSTEM-10 at the Living Computer Museum in Seattle. There is no known free photograph or screenshot of Creeper itself. The subject dates from 1971; the photograph itself is later.