Electronic device system including a portable electronic device having a handwriting input device locked to an expansion station when the power switch of the portable electronic device is turned on

A computer system comprising:

• a portable computer having a pen for inputting information, an input surface pressed by the pen, a power switch manually turned on or off, a controller for outputting a signal, when the power switch is turned on, and a first connector to which the signal from the controller is supplied;
• an expansion station having an expansion device for expanding a function of the computer and an input section connected to a power supply, the expansion station including:
• a main body containing the expansion device and the input section;
• a holding portion supported by the main body and removably holding the computer, the holding portion maintaining the main body together with the input surface in a stand-up state:
• and a second connector arranged in the holding portion, the second connector being electrically connected to the expansion device and the input section, and connected to the first connector when the computer is held by the holding portion, wherein
• the holding portion includes:
• a pair of engaging members movable between a first position in which they hook the computer and a second position in which they are released from the computer, when the first and second connectors are connected to each other;
• and lock means movable between a lock position, in which the engaging members are inhibited from being moved from the first position to the second position, and a lock release position, in which the engaging members are allowed to move from the first position to the second position;
• and
• the lock means is maintained in the lock position, when the computer is connected to the power supply through the first and second connectors and the lock means receives the signal output from the controller through the first and second connectors.