Description of Resource: 
General Comprehensive Operating System (GCOS, /ˈdʒiːkɒs) is a family of operating systems oriented toward mainframe computers. The original version of GCOS was developed by General Electric from 1962; originally called GECOS (the General Electric Comprehensive Operating Supervisor). The operating system is still used today in its most recent version (GCOS 8) on servers and mainframes produced by Groupe Bull, primarily through emulation, to provide continuity with legacy mainframe environments.
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