Compatible Timesharing System

<operating system> (CTSS) One of the earliest (1963) experiments in the design of interactive time-sharing operating systems.

CTSS was ancestral to Multics, Unix, and ITS.

It was developed at the MIT Computation Center by a team led by Fernando J. Corbato.

CTSS ran on a modified IBM 7094 with a second 32K-word bank of memory, using two 2301 drums for swapping.

Remote access was provided to up to 30 users via an IBM 7750 {communications controller} connected to dial-up modems.

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

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