A mobile telephone accesses an application server and application software is launched in the server. The Digital IO Expansion Mechanism includes an input bank, a FIFO, and an IO line. The second roots pump includes a second casing which has a second pump chamber. This virtual machine software is extensible to take advantage of other software andor hardware at the device. The charge air temperature is determined by the temperature of the charge air cooler coolant flow. The digital driver according to the present invention is constituted in such a manner that, by successively inputting digital data to a shift register, the digital data are shifted in the shift register, and the resulting output is sent out to latch circuits.