The System Source Computer Museum in Hunt Valley, Maryland, has a large collection of classic computers dating from the vacuum tube era through supercomputers and pioneering minicomputers and microcomputers. Included in the collection is the only extant UNIVAC 490 real-time computer, which was designed by Seymour Cray before he left UNIVAC to join Control Data Corporation. At NASA, the 490 was used in the Gemini and Apollo programs, with a 490 responsible for running the display screens at Mission Control in Houston. The 490 was designed in the early 1960s using discrete transistor circuitry and shared much of its construction and peripherals with the UNIVAC 1107, which was the first computer I ever used in 1967.