物理/O设备的分类 Human readable devices(人们可读设备) Such as Keyboard, Mouse, Display, Printer and so on Machine readable devices(机器可读设备) Such as Controller, Sensor, Tape Drive, Disk Drive and So on, Communication Devices Such as Modem, Network Adapter and so on物理I/O设备的分类 • Human Readable Devices(人们可读设备） – Such as Keyboard, Mouse, Display, Printer and so on; • Machine Readable Devices（机器可读设备） – Such as Controller, Sensor, Tape Drive, Disk Drive and so on; • Communication Devices – Such as Modem, Network Adapter and so on