In one integrated circuit embodiment, a programmable pull-down output buffer is calibrated by sequentially configuring the buffer at different drive-strength levels and adjusting a source current applied to the buffer until the voltage at an input node of the buffer reaches a reference voltage level. The toy vehicle comprises a chassis that has first and second ends and first and second drive wheels disposed between the first and second ends. The loading device includes a connector for connecting a storage medium, a first program memory part for storing a first authentication program, a second program memory part for storing a second authentication program, and a first processor for authenticating the first authentication program with the second authentication program. When the third power supply section is supplying power during the sleep mode, the controller controls the wiring system opening and closing unit and sets the power supply wiring system of the commercial power supply to the open state. A user touches a point within the active region. The diverter body defining a channel extending in the longitudinal direction and has first and second edges extending in the longitudinal direction and defining an opening into the channel therebetween.