Web site: (not active)
Desktop environment: CLI
Architecture: Cray 1/X-MP
Based on: UNIX
The last version | Released: 1.17.2 | 1990
Cray Operating System (COS) – a Cray Research’s proprietary operating system for its Cray-1 (1976) and Cray X-MP supercomputers.
The Cray Operating System (COS) succeeded Chippewa Operating System (shipped with earlier computer systems CDC 6000 series and CDC 7600) and is Cray Research’s now discontinued proprietary operating system for its Cray-1 (1976) and Cray X-MP supercomputers, and those platforms’ main OS until replaced by UNICOS in the late 1980s. COS was delivered with Cray Assembly Language (CAL), Cray FORTRAN (CFT), and Pascal.
The Cray Operating System successor is UNICOS.
COS 1.17 65.7MB.img