In computing, an opcode (abbreviated from operation code) [1][2] is an enumerated value that specifies the operation to be performed. Opcodes are employed in hardware devices such as arithmetic logic …

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The opcode is the part of a machine language instruction that specifies the operation the CPU is supposed to carry out. It is usually located in the most significant bits of the instruction and is …

Jul 23, 2025 · Opcode containing 4 bits (for DP) and 6 bits (for DT) indicates the type of operation that the instruction performs. (Ex: Addition, Subtraction, etc. in case of DP and Load or Store in case of DT).

This reference is intended to be precise opcode and instruction set reference (including x86-64). Its principal aim is exact definition of instruction parameters and attributes.

If you are interested in computer hardware, you might have heard of the term opcode. But what does it mean and how does it relate to processor instruction sets and assembly language?

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Feb 21, 2024 · What is Opcode? Opcode, short for Operation Code, is fundamental in Computer Science and digital electronics. It plays a crucial role in the execution of machine-level instructions …

Jul 14, 2013 · As its name suggests, the opcode is a type of code that tells the machine what to do, i.e. what operation to perform. Opcode is a type of machine language instruction.