General Comprehensive Operating System

General Comprehensive Operating System (GECOS)
DeveloperGeneral Electric, Honeywell, Groupe Bull, Atos
Working stateCurrent
Initial release1962 (1962)
Latest releaseGCOS 8
PlatformsGE-600 series, Honeywell 6000 series
Licenseproprietary
Official websiteatos.net/en/products/enterprise-servers/bullsequana-m

General Comprehensive Operating System (GCOS, /ˈdʒiːkoʊs/; originally GECOS, General Electric Comprehensive Operating Supervisor) is a family of operating systems oriented toward the 36-bit GE-600 series and Honeywell 6000 series mainframe computers.

The original version of GCOS was developed by General Electric beginning in 1962. The operating system is still used today in its most recent versions (GCOS 7 and GCOS 8) on servers and mainframes produced by Groupe Bull, primarily through emulation, to provide continuity with legacy mainframe environments. GCOS 7 and GCOS 8 are separate branches of the operating system and continue to be developed alongside each other.

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