Users and applications
Formal description
Use in data structures
Architectural roots
Making pointers safer
Simulation using an array index
Project partners & contact details
System Development Corporation
System Development Corporation (SDC) was a computer software company based in Santa Monica, California. Founded in 1955, it is considered the first company of its kind.
SDC began as the systems engineering group for the SAGE air-defense 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 a for-profit corporation in 1969, and began to offer its services to all organizations rather than only to the American military.
In 1991, Unisys Defense Systems was renamed Paramax, a wholly owned subsidiary of Unisys, so that it could be spun off to reduce Unisys debt.
In 1995, Unisys sold Paramax to the Loral Corporation, although a small portion of it, containing some projects that had originated in SDC, remained with Unisys.
In 1996, Loral sold Paramax to Lockheed Martin. In 1997, the Paramax business unit was separated from Lockheed Martin under the control of Frank Lanza (one of the original founders of Loral); it is now a subsidiary of L-3 Communications.
In the 1960s, SDC developed the timesharing system for the AN/FSQ-32 mainframe computer for Defense Advanced Research Projects Agency (DARPA). 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 the Massachusetts Institute of Technology led to computer communication applications such as e-mail. In the 1960s, SDC also developed the JOVIAL programming language and the Time-Shared Data Management System (TDMS), an Inverted File Database System. Both were commonly used in real-time military systems.