operation code

Noun1.operation code - the portion of a set of operation descriptions that specifies the operation to be performed; the set of operations in a computer
Synonyms: order code
(programming)operation code - (Or "op code") The part or parts of a machine language 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 operations.

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.

When programming in assembly language, the op code is represented by a readable name called an instruction mnemonic.
code, computer code, order code
operating capital
operating cost
operating expense
operating instructions
operating microscope
operating procedure
operating room
operating statement
operating surgeon
operating system
Operating System/360
Operating System/Multiprogramming of Fixed Tasks
operating table
operating theater
operating theatre
-- operation code --
Operation Desert Storm
Operation of law
operational casualty
operational cell
operational damage
operational database
operational requirements
operational semantics
operational test and evaluation
operational testing
operations research
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