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