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Incompatible Timesharing System

ITS, the Incompatible Timesharing System, was another early, revolutionary, and influential MIT time-sharing operating system; it was developed principally by the Artificial Intelligence Laboratory at MIT, with some help from Project MAC.

It was the system with the first full inter-computer shared file access, the first device-independent graphics terminal output, and numerous other significant advances.

Among countless other oddities, its top-level command interpreter was a debugger (DDT) whose commands looked like line noise, and its main editor, TECO, was programmable in a similar-looking gibberish.

ITS was developed on the Digital Equipment Corporation PDP-6 and PDP-10 mainframe computers.

ITS was produced by people who disagreed with the direction taken by Multics; the name was a hack on CTSS.

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