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=== Opcodes ===
{{main|Opcode}}
In some architectures, an instruction has a single opcode. In others, some instructions have an opcode and one or more modifiers. E.g., on the [[IBM System/370]], byte 0 is the opcode but when byte 0 is a {{base|B2|16}} then byte 1 selects a specific instruction, e.g., {{base|B205|16}} is store clock (STCK). On some instruction set architectures, one or more [[opcode prefix]]es are used to alter the subsequent opcode or expand the number of opcodes.
=== Operands ===
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