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Computing (FOLDOC) dictionary (also found in English - English (Wordnet), )
operation code
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programming (Or "op code") The part or parts of a machinelanguage instruction which determines what kind of action the
computer should take, e.g. add, jump, load, store. In any
particular instruction set certain fixed bit positions
within the instruction word contain the op code, others give
parameters such as the addresses or registers involved.
For example, in a 32-bit instruction the most significant
eight bits might be the op code giving 256 possible
For some instruction sets, certain values in the fixed bit
positions may select a group of operations and the exact
operation may depend on other bits within instruction word or
subsequent words.