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SDC started in 1955 as the systems engineering group for the SAGE air defense ground system at the RAND Corporation . RAND spun off the group in 1957 as a non-profit organization that provided expertise for the United States military in the design, integration, and testing of large, complex, computer-controlled systems. SDC became for-profit in 1969 . With that change, it began to offer its services to all comers rather than only to the American military. In 1980, SDC was sold by its board of directors to the Burroughs Corporation . In 1986, Burroughs merged with the Sperry Corporation to form Unisys , and SDC was folded into Paramax, Unisys' military subsidiary. In 1995, Unisys sold Paramax to the Loral Corporation , which in turn sold Paramax to Lockheed Martin the following year. SIGNIFICANT CONTRIBUTIONS In the 1960's, SDC developed the timesharing system for the AN/FSQ-32 mainframe computer for ARPA . The Q-32 was one of the first systems to support both multiple users and inter-computer communications. Experiments with a dedicated modem connection to the TX-2 at MIT led to computer communication applications such as email. SDC also developed the JOVIAL programming language commonly used in real-time military systems. EXTERNAL LINKS |