16 Sep 2019


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The Multicians web site presents the story of the Multics operating system for people interested in the system's history, especially Multicians. The site's goals are to

  • preserve the technical ideas and advances of Multics so others don't need to reinvent them.
  • record the history of Multics, its builders, and its users before we all forget.
  • give credit where it's due for important innovations.
  • remember some good times and good people.

The Multicians web site contains 456 HTML files (see the Site Map) comprising over 1,000,000 lines, 600 PDF files, and 455 graphic images. The site has benefited from the contributions of many authors. Contributions are invited: if you have a correction, fact, date, name, anecdote, or picture, please share it with Multicians everywhere by sending mail to the editor.

Multicians mourn the loss of Professor Fernando Corbató.
Harry Reed and Charles Anthony reached a major milestone on the Multics simulator on Saturday 08 November, 2014. Their SIMH-based simulator booted Multics MR 12.5, came to operator command level, entered admin mode, created a small PL/I program, compiled and executed it, and shut down. Release 2.0 of the simulator is now available. There have been multiple updates to Multics for the simulator: the latest version is MR 12.6f, April 2017. Anyone can try out a simulated Multics or install the simulator on their own computer.
Open Source for Multics is hosted at MIT, courtesy of Bull HN. It is available "for any purpose and without fee" provided that the copyright notice and historical background are preserved in all copies.

Multics (Multiplexed Information and Computing Service) was a mainframe timesharing operating system begun in 1965 and used until 2000. Multics began as a research project and was an important influence on operating system development. The system became a commercial product sold by Honeywell to education, government, and industry.

Multics was a prototype of a Computer Utility, providing secure computing to remote users at their terminals. Multicians still miss the elegant, consistent, and powerful programming environment; some Multics features are only now being added to contemporary systems.

Recent Changes
Multicians: Updated entry for Carl Hoffman.
The Palyn Report: Added a story from John Gintell.
Multicians: Updated entries for Mike Broussard, Michael Tague, and Bonnie Braun.
Bibliography: Added CHM interviews with Bill Poduska, Louis Pouzin, Richard Greenblattt, and the late Bob Freiburghouse.
Multicians: Added Entry for John Love.
Simulator: Version 2.0 of the simulator released.

all changes