Cray Operating System
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Template:Infobox OS 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 1984. COS was delivered with Cray Assembler Language (CAL) and Cray FORTRAN (CFT).
See also: Cray Time Sharing System