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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Sep 23, 2011 · An opcode is the first byte of an instruction in machine language which tells the hardware what operation needs to be performed with this instruction. Every processor/controller has its own set …

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).

Intel x86 Opcode Instruction Table This document contains an x86 assembler instruction set opcode table. It lists x86 instructions grouped by their opcodes. For each instruction, it shows the mnemonic, …

An **opcode** (short for **operation code**) is the **binary or hexadecimal representation** of a single instruction that a **central processing unit (CPU)** can execute.

1 Opcodes and Instructions An opcode, short for operation code, is a binary or hexadecimal number that represents a specific instruction for a processor to perform.

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 …

Nov 17, 2025 · Every instruction in assembly language, bytecode, or machine code consists of an opcode followed by zero or more operands. For example, in x86 assembly, the instruction ADD EAX, …