Cray Operating System

The Cray Operating System (COS) was Cray Research's 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.

Read more about Cray Operating System:  Design

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