A portable computer includes a battery and a connection to an external power source, a two-speed data storage device being supplied power from one or more of the battery and the external power source, and a controller attached to the storage device. On a central axis side of the movement of the float body, a pair of guide members is provided, and when the valve body tilts, the valve body and the float body contact each other on a lower side of a tilt of the valve body and the float body ascends, so that the guide members correct the tilt. The invention then independently branches to a target of the branch instruction by each of the processing elements of the plurality of processing elements when each processing element receives the sent branch instruction. The first conductors are respectively in electrical contact with the conductive pads of the chip.