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Cray-3
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===Software=== The Cray-3 ran the Colorado Springs Operating System (''CSOS'') which was based upon Cray Research's [[UNICOS]] [[operating system]] version 5.0. A major difference between CSOS and UNICOS was that CSOS was ported to standard C with all [[Portable C Compiler|PCC]] extensions that were used in UNICOS removed.<ref name=cray-3-soft-intro-manual>{{cite book |title=CRAY-3 Software Introduction Manual |url=http://bitsavers.org/pdf/cray/CRAY-3/3102_CRAY-3_Software_Introduction_Nov91.pdf |publisher=Cray Computer Corporation |date=1991}}</ref> Much of the software available under the Cray-3 was derived from Cray Research and included for instance the [[X Window System]], vectorizing [[FORTRAN]] and [[C (programming language)|C]] compilers, [[Network File System|NFS]] and a [[TCP/IP]] stack.{{sfn|Brochure|1993|p=14}}<ref name=cray-3-soft-intro-manual/>
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