Information Processing Language: Difference between revisions

Revision as of 02:10, 26 September 2020

Revision as of 23:17, 14 March 2021

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==Basics of IPL==

An IPL computer has:

# A set of ''symbols''. All symbols are addresses, and name cells. Unlike symbols in later languages, symbols consist of a character followed by a number, and are written H1, A29, 9-7, 9-100.

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There are eight instructions, based on the values of P: subroutine call, push/pop S to H0; push/pop the symbol in S to the list attached to S; copy value to S; conditional branch. In these instructions, S is the target. S is either the value of the SYMB field if Q=0, the symbol in the cell named by SYMB if Q=1, or the symbol in the cell named by the symbol in the cell named by SYMB if Q=2. In all cases but conditional branch, the LINK field of the cell tells which instruction to execute next.

IPL has a library of some 150 basic operations. These include such operations as:

* Test symbols for equality

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==Further reading==

*Newell, A. and F.C. Shaw. "Programming the Logic Theory Machine." Feb. 1957. Proceedings of the Western Joint Computer Conference, pp. 230-240 230–240.

*Newell, Allen, and Fred M. Tonge. 1960. "An Introduction to Information Processing Language V." CACM 3(4): 205-211.

*Newell, Allen. 1964. ''Information Processing Language-V Manual; Second Edition''. Rand Corporation [Allen Newell], Englewood Cliffs, NJ: Prentice-Hall.

*Samuel, Arthur L.: Programming Computers to Play Games. In: Advances in Computers, Vol. 1, 1960, pp 165-192165–192 (esp.: 171-175).

==External links==

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* [http://bitsavers.org/pdf/rand/ipl/ IPL documents from BitSavers]

* [http://www-formal.stanford.edu/jmc/history/lisp/node2.html Influence of IPL on LISP]

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[[Category:Procedural programming languages]]