(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.
- Reduced level
noun 1. (surveying) calculated elevation in relation to a particular datum
noun, Mechanics. 1. a quantity obtained when one particle is moving about another, larger particle that is also moving, equivalent to the mass of the smaller particle, were the larger particle not moving, and equal to the quotient of the product of the two masses divided by their sum.
- Reduced paid-up insurance
[peyd-uhp] /ˈpeɪdˌʌp/ noun 1. life insurance in which a nonforfeiture value is used to purchase a reduced amount of fully paid-up insurance of the same kind as the surrendered policy.
adjective 1. capable of being reduced. 2. Mathematics. of or relating to a polynomial that can be factored into the product of polynomials, each of lower degree. of or relating to a group that can be written as the direct product of two of its subgroups. of or relating to a set whose set of […]