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Cray Operating System
The
Cray Operating System
(
COS
) succeeded
Chippewa Operating System
(shipped with earlier computer systems
CDC 6000 series
and
CDC 7600
) and 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
.
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