The Incompatible Timesharing System (ITS) was named to distinguish it from another early MIT computer operating system, Compatible Time-Sharing System (CTSS). Richard Stallman was prominent among the contributors, adding many MIT and ITS-related coinages. The File expanded by fits and starts until 1983. Raphael Finkel dropped out of active participation shortly thereafter and Don Woods became the SAIL contact for the File (which was subsequently kept in duplicate at SAIL and MIT, with periodic resynchronizations).

He noticed that it was hardly restricted to 'AI words' and so stored the file on his directory, named as 'AI:MRC SAIL JARGON' ('AI' lab computer, directory 'MRC', file 'SAIL JARGON').

In 1976, Mark Crispin, having seen an announcement about the File on the SAIL computer, FTPed a copy of the File to the MIT AI Lab. Note that it was always called 'AIWORD' or 'the Jargon file', never 'the File' the latter term was coined by Eric Raymond. The revisions of Jargon-1 were all unnumbered and may be collectively considered 'version 1'. Some terms, such as frob, foo and mung are believed to date back to the early 1950s from the Tech Model Railroad Club at MIT and documented in the 1959 Dictionary of the TMRC Language compiled by Peter Samson. From that time until the plug was finally pulled on the SAIL computer in 1991, the File was named 'AIWORD.RF' ('' was a system directory for 'User Program DOCumentation' on the WAITS operating system). The Jargon File (referred to here as 'Jargon-1' or 'the File') was made by Raphael Finkel at Stanford in 1975. The concept of the file began with the Tech Model Railroad Club (TMRC) that came out of early TX-0 and PDP-1 hackers in the 1950s, where the term hacker emerged and the ethic, philosophies and some of the nomenclature emerged. It was published in paperback form in 1983 as The Hacker's Dictionary (edited by Guy Steele), revised in 1991 as The New Hacker's Dictionary (ed. The original Jargon File was a collection of terms from technical cultures such as the MIT AI Lab, the Stanford AI Lab (SAIL) and others of the old ARPANET AI/ LISP/ PDP-10 communities, including Bolt, Beranek and Newman, Carnegie Mellon University, and Worcester Polytechnic Institute. The Jargon File is a glossary and usage dictionary of slang used by computer programmers. Collection of definitions from computer subcultures

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