25 Apr 2014


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 421 HTML files (see the Site Map) comprising over 1,000,000 lines, 19 PDF files, and 365 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.

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.
A project to create a software simulator for the Multics CPU has been started by Harry Reed. Volunteers are most welcome.
MIT is hosting a 50th anniversary celebration of Project MAC/ LCS/ CSAIL in Cambridge, MA on May 28 & 29, 2014. There will be an associated Multicians' reunion event on May 29.

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
B2 Security Evaluation: History of Multics security and the B2 rating.
Multicians: Updated entry for Gary Palter.
Bibliography: Added two security papers.
MTB Index: Added links to 166 MTBs and put them on the site.
Bibliography: Added some security papers.
And They Argued All Night: Added a copy of Mike Padlipsky's essay.

all changes