A super I/O module for controlling at least one I/O port of a computer system is provided. The super I/O module includes a controller, a signal detector and a selector. The controller supports functions corresponding to the I/O port. The signal detector receives an input signal from the I/O port, and detects whether the input signal has an identification code. When detecting that the input signal has the identification code, the signal detector generates a selection signal according to the identification code. The selector receives the selection signal and selectively provides the input signal to the controller or a function circuit of the computer system according to the selection signal.