Super input\/output interface chip I\/O It is generally located on the bottom left or top left of the motherboard, the main chip has Winbond and ITE, it is responsible for the keyboard, mouse, serial port into the serial data into parallel data. At the same time, the data of parallel port and floppy drive port are processed. In our maintenance site, some peripherals such as keyboard and mouse port bad, print port bad can not be used, mostly for I\/O chip bad, sometimes even cause the phenomenon of not bright.