Cray Operating System

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The Cray Operating System ('''COS''') was Cray Research 's proprietary Operating System for its Cray-1 (1976) and Cray X-MP Supercomputer s, 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