1. Mit/gnu Scheme User's Manual
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This article's use of external links may not follow Wikipedia's policies or guidelines. Please improve this article by removing excessive or inappropriate external links, and converting useful links where appropriate into footnote references. (May 2017) (Learn how and when to remove this template message. MIT/GNU Scheme User’s Manual Edition 1.93 for MIT/GNU Scheme 9.0 2010-02-18 by Stephen Adams Chris Hanson and the MIT Scheme Team.

• Running Scheme. This chapter describes how to run MIT Scheme on a unix system or a PC running DOS, Windows 3.1, or Windows NT. It also describes how you can customize the behavior of MIT Scheme using command-line options and environment variables.
• The The Scheme Programming Language, 4th Edition (TSPL), which is a general introduction to and reference for Scheme. It is available for order direct from MIT Press and various online and local retailers. The full text is available online, along with errata. The Chez Scheme User's Guide (CSUG) documents features specific to Chez Scheme.

Scheme or how to interact with it — that is the subject of the MIT/GNU Scheme User’s Manual. This chapter summarizes the semantics of Scheme, briefly describes the MIT/GNU Scheme programming environment, and explains the syntactic and lexical conventions of the language. Subsequent chapters describe special forms, numerous data. See the GNU emacs section of the User's manual. The key bindings for MIT Scheme under emacs are all supported in Edwin. For more information on Edwin (especially on the debugger), see the Edwin section of the User's manual. A few notes on using Edwin. Scheme Programming with MIT/GNU Scheme. Scheme is a programming language. It is a dialect (derivative) of Lisp. It was originally developed by Guy Steele and Gerald Sussman in 1975. MIT/GNU Scheme User's Manual - How to install and run MIT/GNU Scheme. MIT/GNU Scheme Reference Manual - Definition of scheme language supported by MIT/GNU Scheme.

MACLISP (or Maclisp, sometimes styled MacLisp or MacLISP) is a programming language, a dialect of the language Lisp. It originated at the Massachusetts Institute of Technology's (MIT) Project MAC^[1] (from which it derived its prefix) in the late 1960s and was based on Lisp 1.5.^[2]Richard Greenblatt was the main developer of the original codebase for the PDP-6;^[1] Jon L. White was responsible for its later maintenance and development. The name Maclisp began being used in the early 1970s to distinguish it from other forks of PDP-6 Lisp, notably BBN Lisp.

Mit/gnu Scheme User's Manual

History[edit]

Maclisp is a descendant of Lisp 1.5.^[3] Maclisp departs from Lisp 1.5 by using a value cell to access and store the dynamic values of variables;^[4] Lisp 1.5 used a linear search of an association list to determine a variable's value.^[5] The Maclisp variable evaluation is faster but has different variable semantics. Maclisp also employed reader macros to make more readable input and output, termed input/output (I/O). Instead of entering (QUOTE A), one could enter 'A to get the same s-expression. Although both implementations put functions on the property list, Maclisp uses different syntax to define functions.^[6] Maclisp also has a load-on-demand feature.^[7]

Maclisp began on Digital Equipment CorporationPDP-6 and PDP-10 computers running the Incompatible Timesharing System (ITS); later it was ported to all other PDP-10 operating systems, for example, Timesharing / Total Operating System, TOPS-10 and TOPS-20. The original implementation was in assembly language, but a later implementation on Multics used PL/I. Maclisp developed considerably in its lifetime. Major features^[which?] were added which in other language systems would typically correspond to major release numbers.^[dubious]

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Maclisp was used to implement the Macsymacomputer algebra system (CAS) or symbolic algebra program. Macsyma's development also drove several features^[which?] in Maclisp. The SHRDLU blocks-world program was written in Maclisp, and so the language was in widespread use in the artificial intelligence (AI) research community through the early 1980s. It was also used to implement other programming languages, such as Planner and Scheme. Multics Maclisp was used to implement the first Lisp-based Emacs.

Maclisp was an influential Lisp implementation, but is no longer maintained actively. It now runs on PDP-10 emulators and can be used for experimenting with early AI programs.

Mit Gnu Scheme

Characteristics[edit]

Maclisp began with a small, fixed number of data types: cons cell, atom (later termed symbol), integer, and floating-point number. Later additions included: arrays, which were never first-class data types; arbitrary-precision integers (bignums); strings; and tuples. All objects (except inums) were implemented as pointers, and their data type was determined by the block of memory into which it pointed, with a special case for small numbers (inums).

Programs could be interpreted or compiled. Compiled behavior was the same as interpreted except that local variables were lexical by default in compiled code, unless declared SPECIAL,^[8] and no error checking was done for inline operations such as CAR and CDR. The Ncomplr compiler (mid-1970s) introduced fast numeric support to Lisp languages, generating machine code (instructions) for arithmetic rather than calling interpretive routines which dispatched on data type. This made Lisp arithmetic comparable in speed to Fortran for scalar operations (though Fortran array and loop implementation remained much faster).

The original version was limited by the 18-bit word memory address of the PDP-10, and considerable effort was expended in keeping the implementation lean and simple. Multics Maclisp had a far larger address space, but was costly to use. When the memory and processing power of the PDP-10 were exceeded, the Lisp Machine was invented: Lisp Machine Lisp is the direct descendant of Maclisp. Several other Lisp dialects were also in use, and the need to unify the community resulted in the modern Common Lisp language.

Name[edit]

MACLISP was named for Project MAC, and is unrelated to Apple's Macintosh (Mac) computer, which it predates by decades. The various Lisp systems for the Macintosh have no particular similarity to Maclisp.^[9]

References[edit]

1. ^ ^abLevy, Steven (1984). Hackers: Heroes of the Computer Revolution. Doubleday. ISBN0-385-19195-2.
2. ^Project MAC Progress Report IV: July 1966 to July 1967(PDF) (Report). n.d. p. 19. The higher-level language used for most of the vision laboratory program is the PDP-6 LISP System. This system is based chiefly on the LISP 1.5 programming language, but has been extensively modified in a number of ways. These include many new functions and services, including facilities for linking with programs written in other languages.
3. ^Moon 1974, p. 1
4. ^Moon 1974, p. 47
5. ^Lisp 1.5 p. 13, evaluating an atom e in the environment a is done with (cdr (assoc e a)). That involves a linear search of the association list a. A more involved description with global constants and errors is given on p. 71; it does a linear search of the property list before searching the association list.
6. ^Maclisp uses defun; Lisp 1.5 uses define.
7. ^Moon 1974, p. 107; the autoload property.
8. ^Pitman, Kent (December 16, 2007). 'The Revised Maclisp Manual (The Pitmanual), Sunday Morning Edition'. MACLISP.info. HyperMeta, Inc. Declarations and the Compiler, Concept 'Variables'. Retrieved October 20, 2018. If the variable to be bound has been declared to be special, the binding is compiled as code to imitate the way the interpreter binds variables.
9. ^Pitman, Kent (December 16, 2007). 'The Revised Maclisp Manual (The Pitmanual), Sunday Morning Edition'. MACLISP.info. HyperMeta Inc. p. 1 FAQ q1. Retrieved October 20, 2018. Project MAC had nothing to do with the Apple 'Mac'. And neither did MACLISP.

External links[edit]

• http://www.softwarepreservation.org/projects/LISP/maclisp_family/ contains a bibliography of Maclisp.
  • John L. White. An Interim LISP User's Guide. Artificial Intelligence Memo No. 190, Project MAC, Massachusetts Institute of Technology, March 1970, 87 pages. ftp://publications.ai.mit.edu/ai-publications/pdf/AIM-190.pdf states 'MACLISP' refers to the PDP/6 implementation of the programming language LISP in use at the Artificial Intelligence Group of Project MAC.'
  • 'In 1973 and 1974, David A. Moon led an effort to implement MacLisp on the Honeywell 6180 under Multics. As a part of this project he wrote the first truly comprehensive reference manual for Maclisp, which became familiarly known as the 'Moonual'.' [Steele and Gabriel 1993]
  • Jon L. White [JONL], Eric Rosen [ECR], Richard M. Stallman [RMS], Guy L. Steele Jr. [GLS], Howard I. Cannon [HIC], Bob Kerns [RWK]. LISP News. MacLisp release notes.
  • Jon L. White. LISP: Program is Data: A Historical Perspective on MacLISP. Proceedings of the 1977 MACSYMA Users' Conference. NASA Scientific and Technical Information Office (Washington, D.C., July 1977), pages 181-189. PDF
• McCarthy, John; Abrahams, Paul W.; Edwards, Daniel J.; Hart, Timothy P.; Levin, Michael I. (1985) [1962]. LISP 1.5 Programmer's Manual (2nd ed.). MIT Press. ISBN0-262-13011-4.
• Moon, David (1974). Maclisp Reference Manual(PDF).
• The Revised Maclisp Manual (1983) by Kent Pitman
• The Multics MACLISP compiler (1977) by Bernard Greenberg