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The Incompatible Time Sharing System (ITS) was developed at the Massachusetts Institute of Technology's AI Lab ([1]) in the late 1960s. It was written in assembly language and ran on Digital Equipment Corporations PDP-10s at MIT until 1990, and then until 1995 at the Stacken Computer Club in Sweden.

The name was a takeoff on CTSS, the Compatible Time-sharing System developed by Corbató, Fano et. al. for the IBM 7090 and 7094

Despite its small user base, it has had immense influence due to the software originally developed for it. This includes:

* EmacsEditor * Info (the very first WikiForum, now ported onto Unix) * TecoEditor * MacLisp (the precursor of EmacsLisp and CommonLisp) * MacSyma? (a symbolic mathematics system, precursor of Maxima [2])

The Jargon File also started out life on ITS.

ITS nowadays runs on Ken Harrenstien's PDP-10 simulator ([3]). A snapshot of the final file system (except for user pages) can be found at ([4]). The modern Jargon File entry is http://catb.org/~esr/jargon/html/I/ITS.html.

Processes were structured hierarchically in ITS. Files were grouped into directories, one per user. It was possible to access files on other machines over the network.

For further information, see [5].

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