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+====== TWENEX MACLISP Tutorial ======
+**Lisp** is a programming language famous for its use in Artificial Intelligence and advanced Computer Science research. First developed in 1958, it is the second oldest (after Fortran) high-level programming language still in common use.
+Two dialects of Lisp are available at TWENEX.ORG, Maclisp and [[interlisp|InterLisp-10]].
+===== Maclisp =====
+(''@MACLISP'')
+**Maclisp** was developed in the mid-1960's as part of MIT's Project MAC((for **M**athematics **A**nd **C**omputation. The name is unrelated to the later-developed Apple Macintosh computer)), originally for the PDP-6 ITS operating system.
+Maclisp was a highly influential language and was the primary inspiration for Common Lisp, with contributions form other dialects like InterLisp.
+=== Set-up ===
+Before running MACLISP, you must define the following logical name:
+''@DEFINE MACLISP: PS:<MACLISP>''
+(You can add the above line to your LOGIN.CMD file to automatically define the logical name for all of you TWENEX sessions.)
+It is also recommended that you create a Maclisp init file (''LISP.INI'') in your home directory with the following contents:
+  ;;; A very typical init file / Emacs mode--> -*- Mode:LISP; -*-
+  (COMMENT) ;magic
+  (PROGN ; real init file stuff
+    (SETQ BASE 10. IBASE 10. *NOPRINT NIL) ;base-10 display
+    (SETQ NOUUO T *RSET T) ;these make debugging easier
+    (SSTATUS FEATURE NOLDMSG) ;supress module load messages
+    '*) ;return an asterisk for Maclisp to print out
+=== LEDIT ===
+''LEDIT'' is a software package that allows a programmer to inspect, modify, and save Lisp source expressions from within a Maclisp session, abilities Maclisp itself lacks. This is achieved  by calling the Emacs editor from the programmer's Maclisp session.
+To use LEDIT:
+  - Start Maclisp and load your source file.
+  - Evaluate ''(LOAD "LISP:LEDIT.FASL")'' (You may add this line to your LISP.INI file and eliminate this step.)
+  - Evaluate ''(LEDIT)'' to switch to Emacs.
+  - Load the source file into Emacs (''^X ^F'').
+  - View, change, save source with Emacs commands.
+  - Flag function definitions to update in Maclisp with ''M-Z''.
+  - Return to Maclisp with ''^X Z''.
+===== References =====
+[[http://www.maclisp.info/pitmanual/index.html|K.M. Pitman. (2007, December 16). The Revised Maclisp Manual [Online]. Available: http://www.maclisp.info/pitmanual]]

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