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Louisiana, Lafayette LA">USL</a> </li> <li> <a href="site-vpi.html" title="Virginia Polytechnic Institute, Blacksburg, VA">VPI</a> </li> </ul> <div class="clr"></div> </li> <li> <a href="about-multics.html" title="About the web site">About   »  </a> <ul> <li> <a href="changes.html" title="Reverse chronological list of website changes this year">Changes</a> </li> <li> <a href="multics-news.html" title="Current Multics events">News</a> </li> <li> <a href="mult-links.html" title="Links to other sites on the Web relevant to Multics">Links</a> </li> <li> <a href="multics-images.html" title="Thumbnails of images on the site">Image Gallery</a> </li> <li> <a href="sitemap.html" title="Site Map">Site Map</a> </li> </ul> <div class="clr"></div> </li> </ul> </nav>  <a href="gsearch.html" style="float:right;" target="_blank"><img src="mulimg/mg2.gif" width="25" height="25" alt="search" title="search multicians.org"></a> </div>   <div class="altmenubar" id="alt-main-nav" role="navigation" aria-label="Main"> <nav> <div id="menuToggle">  <input type="checkbox" id="switchmenus">  <a href="gsearch.html" target="_blank"><img src="mulimg/mg2.gif" width="25" height="25" alt="search" title="search multicians.org" style="float:right; display:inline;"></a> <label for="switchmenus" class="altmenuword"> MENU</label>  <div class="peekaboo"> <span> <br><a href="history.html">History</a>: <a href="features.html">Features</a> | <a href="myths.html">Myths</a> | <a href="project-mac.html">Project MAC</a> | <a href="chrono.html">Dates</a> | <a href="mgloss.html">Glossary</a> | <a href="mhp.html">History Proj</a> | <a href="corby-letter.html">Last site</a> | <br><a href="multicians.html">People</a>: <a href="multics-stories.html">Stories</a> | <a href="people-pictures.html">People Pictures</a> | <a href="multics-humor.html">Humor</a> | <a href="memorabilia.html">Memorabilia</a> | <br><a href="biblio.html">Library</a>: <a href="papers.html">Papers</a> | <a href="articles.html">Articles</a> | <a href="devdoc.html">Dev Docs</a> | <a href="multics-source.html">Source</a> | <a href="simulator.html">Simulator</a> | <br><a href="sites.html">Sites</a>: <a href="site-timeline.html">Site Timeline</a> | <br><a href="about-multics.html">About</a>: <a href="changes.html">Changes</a> | <a href="multics-news.html">News</a> | <a href="mult-links.html">Links</a> | <a href="multics-images.html">Image Gallery</a> | <a href="sitemap.html">Site Map</a> | </span> </div> </div> </nav> </div>  <div class="main"> <div class="colmask holygrail"> <div class="colmid"> <div class="colright"> <div class="col1wrap"> <div class="col1pad"> <div class="col1">  <main> <div class="about"> <p> The Multicians web site presents the story of the Multics operating system for people interested in the system's history, especially <a href="mgm.html#Multician" title="glossary: Anyone who contributed to the development and success of...">Multicians</a>. The site's goals are to </p> <ul class="goals"> <li>preserve the technical ideas and advances of Multics so others don't need to reinvent them.</li> <li>record the history of Multics, its builders, and its users before we all forget.</li> <li>give credit where it's due for important innovations.</li> <li>remember some good times and good people.</li> </ul> <p class="content"> The Multicians web site contains 487 HTML files (see the <a href="sitemap.html" title="about: Site Map by Tom Van Vleck">Site Map</a>) comprising over 540K lines, 1795 PDF files, and 670 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. </div> </main>  <div class="midtext"> The late Harry Reed and Charles Anthony reached a major milestone on the <a href="simulator.html" title="About the SIMH based simulator for the Honeywell 6180 (DPS8M).">Multics simulator</a> on Saturday 08 November, 2014. Their <a href="multics-news.html#hreedsim" title="Current events involving Multics">SIMH-based simulator</a> 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. <b>Release 3.0.1 of the simulator is now available.</b> There have been multiple updates to Multics for the simulator: the latest version is <a href="https://multics-wiki.swenson.org" title="new window: https://multics-wiki.swenson.org" target="_blank" rel="noopener"><span class="nb"><img src="mulimg/tinyglob.gif" alt="" width="12" height="11" style="display: inline;"> <b>MR 12.8, August 2023</b></span></a>. Anyone can try out a simulated Multics or install the simulator on their own computer. </div> <div class="midtext"> <a href="https://web.mit.edu/multics-history/" title="new window: https://web.mit.edu/multics-history/" target="_blank" rel="noopener"><span class="nb"><img src="mulimg/tinyglob.gif" alt="" width="12" height="11" style="display: inline;"> Open Source for Multics</span></a> 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. </div> </div>  </div>  </div>  <div class="col2">  <div class="blurb"> <p> <strong>Multics</strong> (Multiplexed Information and Computing Service) was a mainframe time-sharing 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. </p> <p> Multics was a prototype of a <a href="mgc.html#computerutility" title="glossary: A computer, its software, and staff set up to...">Computer Utility</a>, 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. </p> </div> </div>  <div class="col3"> <div class="slideshow" id="slider"> <ul> <li><a href="multics-stories.html" title="CISL H6180 Multics computer, Dec 1973 [THVV]"><span class="sc_whmd">  87 Multics Stories</span><img src="mulimg/clearpix.gif" width="300" height="244" alt="" class="csssliderh6180doorsopen2xjpg"></a></li> <li class="starthidden"><a href="corby.html" title="Corby, 2016 [Jason Dorfman]"><span class="sc_bkhi">  Corby (1926-2019)</span><img src="mulimg/clearpix.gif" width="300" height="244" alt="" class="cssslidercorbydorfman2xjpg"></a></li> <li class="starthidden"><a href="history.html" title="timeline"><span class="sc_bkhi">  History 1963-2025</span><img src="mulimg/clearpix.gif" width="300" height="244" alt="" class="cssslidermtimeline2xgif"></a></li> <li class="starthidden"><a href="multicians.html" 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