Complex instruction set computer (cisc)
Complex instruction set computer (cisc) a processor with a large quantity of instructions, some of which may be quite complicated, as well as a large quantity of different addressing modes, instruction and data formats, and other attributes. The designation was put forth to distinguish cpus such as those in the motorola m68000 family and the intel pentium from another approach to cpu design that emphasized a simplified instruction set with fewer but possibly faster executing instructions, called risc processors. One cisc processor, the digital vax, has over 300 instructions, 16 addressing modes, and its instruction formats may take up 1 to 51 bytes.
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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