GE was one of the eight major computer companies of the 1960s along with IBM, Burroughs, NCR, Control Data Corporation, Honeywell, RCA, and UNIVAC.[35] GE had a line of general purpose and special purpose computers, including the GE 200, GE 400, and GE 600 series general purpose computers,[35] the GE 4010, GE 4020, and GE 4060 real-time process control computers, and the DATANET-30 and Datanet 355 message switching computers (DATANET-30 and 355 were also used as front end processors for GE mainframe computers). A Datanet 500 computer was designed, but never sold.[36]