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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