微机的串/并口是与外设打交道的重要接口、也是微机中最为脆弱的部位,当出现与之相连的外设联不上机的情况时,只要自制一个模拟插头,将其插在串口或并口上,利用高级诊断程序对串口或并口进行测试,即可确定串口或并口是否 Computer serial / parallel port is an important interface with the peripheral interface, but also the most vulnerable parts of the computer, when connected peripherals are not connected to the case, as long as a homemade analog plug, plug it in the serial port or Parallel port, the use of high-level diagnostic procedures on the serial port or parallel port to test, you can determine whether the serial or parallel port