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Lisp at TWENEX.ORG 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, InterLisp-10 and Maclisp.



InterLisp was developed in 1967 at Bolt, Beranek and Newman (BBN) for TENEX, BBN's in-house PDP-10 operating system. Development was later transfered to XEROX PARC. The language became popular with Stanford University AI researchers and at other principly US West-Coast institutions.

InterLisp was noted for its integration of interactive development tools into the the programming environment: debugger, Lisp-structure-aware editor, spelling corrector, file manager.

The dialect was in a rivalry with Maclisp prior to the development of Common Lisp.



Maclisp was developed in the mid-1960's as part of MIT's Project MAC1), 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.


W. Teitelman. (1974). InterLisp Reference Manual [Online]. Available:

K.M. Pitman. (2007, December 16). The Revised Maclisp Manual [Online]. Available:

C. Weissman. (1967). Lisp 1.5 Primer [Online]. Available:


(Is LEDIT another Lisp dialect, or just a TOPS-20 Emacs (non-/pre-GNU/Elisp) mode for editing Lisp source code?)

  1. LEDIT is a module for connecting MACLISP & Emacs. You can inspect, edit, & save source in Emacs, then evaluate/run it in MACLISP. It's documented in INFO. There's supposed to be another module to do the same with InterLisp. I'd like to figure out how to use this. – papa
for Mathematics And Computation. The name is unrelated to the later-developed Apple Macintosh computer
tutorials/lisp.1488514742.txt.gz · Last modified: 2017/03/03 04:19 by papa