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== MIT's Lisp machine operating system == The Lisp Machine operating system was written in [[Lisp Machine Lisp]]. It was a one-user workstation initially targeted at software developers for [[artificial intelligence]] (AI) projects.<ref>{{cite journal |title=A Lisp Machine |journal=Proceedings of the Fifth Workshop on Computer Architecture for Non-numeric Processing |publisher=Association for Computing Machinery β Special Interest Group on Information Retrieval |year=1980 |doi=10.1145/800083.802703|last1=Greenblatt |first1=Richard D. |last2=Knight |first2=Thomas F. |last3=Holloway |first3=John T. |last4=Moon |first4=David A. |pages=137β138 |s2cid=10081363 }}</ref> The system had a large [[bitmap]] screen, a mouse, a keyboard, a [[Computer network|network]] interface, a disk drive, and slots for expansion. The operating system was supporting this hardware and it provided (among others): * code for a frontend processor * means to boot the operating system * [[virtual memory]] management * [[garbage collection (computer science)|garbage collection]] * interface to various hardware: mouse, keyboard, bitmap frame buffer, disk, printer, network interface * an interpreter and a native code compiler for Lisp Machine Lisp * an object system: [[Flavors (programming language)|Flavors]] * a [[graphical user interface]] (GUI) window system and [[window manager]] * a local [[file system]] * support for the [[Chaosnet]] (CHAOS) network * an [[Emacs]]-like Editor named [[Zmacs]] * a mail program named Zmail * a Lisp listener * a [[debugger]] This was already a complete one-user Lisp-based operating system and development environment. The MIT Lisp machine operating system was developed from the middle 1970s to the early 1980s. In 2006, the [[source code]] for this Lisp machine operating system from MIT was released as [[free and open-source software]].<ref>{{cite web |url=http://www.unlambda.com/index.php?n=Main.Mit |title=Retrocomputing β MIT CADR Lisp Machines |author=<!--Unstated--> |date=<!--Unstated--> |website=Unlambda.com |access-date=2018-12-01}}</ref>
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