A new lighting system is provided that is particularly useful in projecting light to a deck where pilots use night vision goggles. A microcomputer to be used in a notebook PC is disclosed, in which programs of a keyboardpower management BIOS and a system BIOS are stored in a built-in flash memory ROM. A round rib is disposed on an inner end surface of the first saw blade, and at least three recessed holes are arranged in a top end surface of the round rib at equal angle intervals. The processes are scheduled on the shared processor according to the jointly determined activation times to minimize queuing delay. The teeth are arranged in a plurality of rows. Accordingly, a signal transmission characteristic can be enhanced, test expenses can be reduced, and ground noise can be reduced.