A sequence of elementary instructions that corresponds to a specific computer operation, that is maintained in special storage, and whose execution is initiated by the introduction of a computer instruction into an instructionregister of acomputer.

• 对应于某一特定的计算机操作的一种基本指令序列，保存在专用的存储器中，由引入到计算机指令寄存器的一条计算机指令启动执行。