为了便于获取指令，处理器把需要的由二元数据构成的地址存储在外部处理机总线的序列里面。
To carry out a fetch, the processor places the binary-code address of the desired location onto the address lines of the external processor bus.
计算机硬件系统的设计方法，必要时可增加中央处理机的硬件或外部设备来扩充机器的性能。
The design of computers to permit expansion of their capabilities by increasing the central processor 's hardware and the number of peripheral devices as required.
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