System and method for operation mode control in a computer system

A system for operation mode control for use in a computer system, comprising:

• a mode controller for generating a combination of electric potentials on a first connection terminal and a second connection terminal;
• and
• an additional microprocessor, comprising:
• a storage module, further comprising:
• a mode list recording a plurality of operation modes;
• and
• a pointer designating one of operation modes in the mode list as a first operation mode;
• a detection module for detecting the combination of the electric potentials at a first sampling point, and determine a shift direction of the mode controller according thereto;
• and
• a control module for selecting a second operation mode adjacent to the first operation mode in the mode list according to the shift direction, checking a disparity between the first and the second operation modes, generate a control signal to the computer system according to the check result, directing the computer system to reboot or execute an application specific to the second operation mode, and subsequently enabling the computer system to operate in the second operation mode.