JargonFile/entries/CTSS.txt

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CTSS
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/CTSS/ , n. Compatible Time-Sharing System. An early (1963) experiment in
the design of interactive timesharing operating systems, ancestral to
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Multics, Unix, and ITS. The name ITS (Incompatible Time-sharing System)
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was a hack on CTSS, meant both as a joke and to express some basic
differences in philosophy about the way I/O services should be presented to
user programs.