Reduced instruction set computers
Two of the best known families of microprocessor are those based on the Motorola 68000 and Intel 8086 architectures, the 680×0 family gaining popularity through its association with the Apple Macintosh and the 80×86 family through association with the original IBM PC. By adopting this family approach, first introduced for IBM mainframes in the mid-sixties, processor designers have been able to take advantage of the implementation techniques and speed increases offered by advances in Very Large Scale Integration (VLSI) technology, while continuing to support a common architecture. Supporting a common architecture is important because it allows software written for older machines to run on newer ones and thus protects the customers’ software investment.
KeywordsClock Cycle Very Large Scale Integration Very Long Instruction Word Processor Designer Instruction Execution
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