Abstract: A computer system which has a connection port to transmit data is provided with a user input unit through which a user inputs a password; a switch which is turned ON/OFF to transmit data through the connection port; and a processor subsystem which outputs a control signal to control operation of the switch to transmit data through the connection port, when the input password matches a preset password. As a result, the computer system is able to efficiently control data transmission between a processor subsystem and an external storage device.

Abstract: An electronic device includes a system unit having a plurality of electronic components; a system power supply supplying power to the system unit; a system power controller managing the power supplied from the system power supply to the system unit; and an adaptor including an AC/DC converter converting AC power inputted thereto into DC power corresponding to a selected voltage level amongst a plurality of voltage levels outputted therefrom and outputting the DC power corresponding to the selected voltage level, and an adaptor controller controlling the AC/DC converter to output the DC power corresponding to the selected voltage level amongst the plurality of voltage levels to the system power supply, based on a level selection signal supplied from the system power controller. Thus, the present invention provides an electronic device having an adaptor which can selectively output power according to a level selection signal supplied from the electronic device, and the adaptor used therewith.