Ariel
<language>
An array-oriented language for the CDC 6400.
["Ariel Reference Manual", P. Devel, TR 22, CC UC Berkeley, Apr 1968]. ["A New Survey of the Ariel Programming Language", P. Deuel, TR 4, Ariel Consortium, UC Berkeley, June 1972]. [Deuel or Devel?]Last updated: 1995-12-29
ARI Service
<company>
The trading name of the remnants of AST Research, Inc.. ARI Services is a wholly owned subsidiary of Samsung Electronics Co. Ltd., of Seoul, Korea. They no longer manufacture or distribute computer hardware, but they continue to provide worldwide technical and service support to owners of systems that they manufactured.
AST Computers, LLC is a separate company. Headquarters: 16225 Alton Parkway, POB 57005, Irvine, California 92619-7005, USA. http://ari-service.com/.Last updated: 2000-03-28
ARITH-MATIC
<language>
An extension of Grace Hopper's A-2 programming language, developed in about 1955. ARITH-MATIC was originally known as A-3, but was renamed by the marketing department of Remington Rand UNIVAC.
http://cispom.boisestate.edu/cis221emaxson/hophtm.htm. [How was A-2 extended?]Last updated: 2001-01-27
Arithmetic and Logic Unit
(ALU or "mill") The part of the central processing unit which performs operations such as addition, subtraction and multiplication of integers and bit-wise AND, OR, NOT, XOR and other Boolean operations. The CPU's instruction decode logic determines which particular operation the ALU should perform, the source of the operands and the destination of the result.
The width in bits of the words which the ALU handles is usually the same as that quoted for the processor as a whole whereas its external busses may be narrower. Floating-point operations are usually done by a separate "floating-point unit". Some processors use the ALU for address calculations (e.g. incrementing the program counter), others have separate logic for this.Last updated: 1995-03-24
arithmetic mean
The mean of a list of N numbers calculated by dividing their sum by N. The arithmetic mean is appropriate for sets of numbers that are added together or that form an arithmetic series. If all the numbers in the list were changed to their arithmetic mean then their total would stay the same.
For sets of numbers that are multiplied together, the geometric mean is more appropriate.Last updated: 2007-03-20
arity
The number of arguments a function or operator takes. In some languages functions may have variable arity which sometimes means their last or only argument is actually a list of arguments.
Last updated: 1997-07-21
Nearby terms:
argument ♦ Argus ♦ Ariel ♦ ARI Service ♦ ARITH-MATIC ♦ Arithmetic and Logic Unit
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