General Comprehensive Operating System
General Comprehensive Operating System 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. Wikipedia
Developer: Groupe Bull, Honeywell International, Inc., General Electric, and more
License: Proprietary software
Initial release: 1962; 62 years ago
Latest release: GCOS 8