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-- reduced instruction set computer --
reduced instruction set computing
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reduced instruction set computer

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Noun1.reduced instruction set computer - (computer science) a kind of computer architecture that has a relatively small set of computer instructions that it can perform
Antonyms:
complex instruction set computer, complex instruction set computing, CISC - (computer science) a kind of computer architecture that has a large number of instructions hard coded into the cpu chip
(processor)Reduced Instruction Set Computer - (RISC) A processor whose design is based on the rapid execution of a sequence of simple instructions rather than on the provision of a large variety of complex instructions (as in a Complex Instruction Set Computer).

Features which are generally found in RISC designs are uniform instruction encoding (e.g. the op-code is always in the same bit positions in each instruction which is always one word long), which allows faster decoding; a homogenous register set, allowing any register to be used in any context and simplifying compiler design; and simple addressing modes with more complex modes replaced by sequences of simple arithmetic instructions.

Examples of (more or less) RISC processors are the Berkeley RISC, HP-PA, Clipper, i960, AMD 29000, MIPS R2000 and DEC Alpha. IBM's first RISC computer was the RT/PC (IBM 801), they now produce the RISC-based RISC System/6000 and SP/2 lines.

Despite Apple Computer's bogus claims for their PowerPC-based Macintoshes, the first RISC processor used in a personal computer was the Advanced RISC Machine (ARM) used in the Acorn Archimedes.
architecture, CISC, complex instruction set computer, complex instruction set computing, computer architecture, computer science, computing, reduced instruction set computing, RISC

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