Cray Operating System
The Cray Operating System (COS) is a Cray Research operating system for its now-discontinued Cray-1 (1976) and Cray X-MP supercomputers. It succeeded the Chippewa Operating System (shipped with earlier Control Data Corporation CDC 6000 series and 7600 computer systems), and was the Cray main OS until replaced by UNICOS in the late 1980s. COS was delivered with Cray Assembly Language (CAL), Cray FORTRAN (CFT), and Pascal.
| Developer | Cray Research |
|---|---|
| Working state | Discontinued |
| Initial release | 1975 |
| Latest release | 1.17.2 / July 1990 |
| Marketing target | Supercomputers |
| Available in | English |
| Platforms | Cray-1, Cray X-MP line |
| Influenced by | CDC SCOPE |
| License | Proprietary |
| Preceded by | Chippewa Operating System |
| Succeeded by | UNICOS |
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