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Time-sharing,
multiple users, interactive
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Many
concurrent users logged on
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Interactive
editing and computing
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Self
submission of batch jobs
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Protection
among users, protection among jobs
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Fair
allocation of resources
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All
university computing centers since about 1970
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E.g.,
MULTICS, IBM 360/67, DEC PDP-10, PDP-20
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Advanced
minicomputers
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DEC,
Data General, Prime, etc.
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Unix
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