When a serial external interface receives a port address from a host device, a CPU reads data at all device addresses corresponding to the port address from a secondary storage medium and writes the data to a primary storage medium. A pair of conductors of a continuous form is used for each phase of the machine. By this means, the IGCC plant can minimize blow-off of oxygen gas produced from the air. Each of the two types of HFATs contains a number of entries. When the switching mechanism is located at a first position, the image beam is projected along a first projecting path, and the portable electronic device is in a first operating mode.