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Incompatible Timesharing System (ITS) is an early operating system written in assembly language. It was developed chiefly by the Artificial Intelligence Laboratory with input from the seminal Project MAC at the Massachusetts Institute of Technology (MIT). ITS supports Programmed Data Processor-6 and Programmed Data Processor-10.
Both ITS and the applications developed on it were influential in terms of their technical impact.Some of the important applications developed on ITS were EMACS and GNU information. Some programming languages like MacLisp (the precursor of Zeta lisp and common Lisp), Micro Planner, MDL and Scheme were also developed on ITS. ITS was also a crucial factor in the development of the hacker culture, which arose within MIT's computer culture in the 1960s.
The ITS OS was developed in late 1960s and continued to be used up to 1990 at MIT, and until 1995 at the Stacken Computer Club in Sweden.
Some of the important technical features of ITS are as follows: