The typical digital computer has five different units or sections: an input unit where information or orders go into the computer;

一个控制装置，它根据输入的指令控制着计算机的运行；

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The control system is composed of setting unit(host computer ), digital controller , input channel (position detector)and output channel (actuating mechanism).

电控系统由设定器（上位机）、数字控制器、输入通道（位置检测）和后向通道（执行机构）构成。

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All computer systems of interest to us are similar. They contain hardware components for input, central processing unit and output.

我们目前感兴趣的计算机系统都是相似的，它们的硬件设备均包含输入设备，中央处理器和输出设备。

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The NOR type needs to be ultrafast because it is directly connected to the central processing unit of a computer and stores its basic input-output system (the operating system used by the microchip that lies beneath user-interface operating systems, such as Windows).

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