CTSS

Compatible Time-Sharing System. An early (1963) experiment in the design of interactive timesharing operating systems, ancestral to {Multics}, {Unix}, and {ITS}. The name {ITS} (Incompatible Time-sharing System) 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. See {timesharing}.

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