History
CICS was preceded by an earlier, single threaded transaction processing system, IBM MTCS. An 'MTCS-CICS bridge', a type of middleware, was later developed to allow these transactions to execute under CICS with no change to the original application programs.
CICS was originally developed in the United States at an IBM Development Center in Des Plaines, Illinois, beginning in 1966 to address requirements from the public utility industry. The first CICS product was released in 1968, named Public Utility Customer Information Control System, or PU-CICS. It became clear immediately that it had applicability to many other industries, so the Public Utility prefix was dropped with the introduction of the first release of the CICS Program Product on July 8, 1969, not long after IMS database management system.
In 1974, CICS development responsibility was shifted to IBM's Hursley, United Kingdom Laboratory, where development work continues today.
Read more about this topic: CICS
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