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In page General Electric:

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In 1962, GE started developing its GECOS (later renamed GCOS) operating system, originally for batch processing, but later extended to time-sharing and transaction processing. Versions of GCOS are still in use today. From 1964 to 1969, GE and Bell Laboratories (which soon dropped out) joined with MIT to develop the Multics operating system on the GE 645 mainframe computer. The project took longer than expected and was not a major commercial success, but it demonstrated concepts such as single-level storage, dynamic linking, hierarchical file system, and ring-oriented security. Active development of Multics continued until 1985.[citation needed]