Device drives are specialized programs that allow particular input or output devices to communicate with rest of the computer system.
设备驱动器是专门的方案，允许特定输入或输出设备进行通信与计算机系统的其余部分。
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The periphery output control system is composed of analog peripheral device such as LED, relay, digital switch etc, to control the other weak-current devices and general heavy-current devices.