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Opcode ○꠹｜Definition｜1st｜20251119205401-00-⌔
Opcode
In computing, an opcode (abbreviated from operation code)12 is an enumerated value that specifies the operation to be performed. Opcodes are employed in hardware devices such as arithmetic logic units (ALUs), central processing units (CPUs), and software instruction sets. In ALUs, the opcode is directly applied to circuitry via an input signal bus. In contrast, in CPUs, the opcode is the portion of a machine language instruction that specifies the operation to be performed.
Printed 2026-06-28.
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Link to original Footnotes
Barron, David William (1978) [1971, 1969]. “2.1. Symbolic instructions”. Written at University of Southampton, Southampton, UK. In Floretin, J. John (ed.). Assemblers and Loaders. Computer Monographs (3 ed.). New York, USA: Elsevier North-Holland Inc. p. 7. ISBN 0-444-19462-2. LCCN 78-19961. (xii+100 pages) ↩
Chiba, Shigeru (2007) [1999]. “Javassist, a Java-bytecode translator toolkit”. Archived from the original on 2020-03-02. Retrieved 2016-05-27. ↩
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