Motherboard for selecting one of sub-systems immediately

A motherboard for selecting one of sub-systems immediately, comprising:

• a plurality of sub-systems individually having a corresponding kernel unit, a corresponding interface control unit, and a corresponding power circuit;
• a shared/control unit electrically coupled to the sub-systems;
• and
• an input/output unit electrically coupled to the shared/control unit and the sub-systems;
• according to an external selecting signal, the shared/control unit selects a corresponding sub-system to be a target sub-system, and then the shared/control unit inputs a corresponding signal of the target sub-system into the input/output unit;
• the target sub-system outputs at least a first specific signal to a corresponding peripheral, and the corresponding peripheral outputs at least a second specific signal to the target sub-system, such that the target sub-system can independently control the corresponding shared peripheral.