| 摘要 |
PROBLEM TO BE SOLVED: To previously prevent a communication error and malfunction when a battery is consumed. SOLUTION: A power voltage detection part 13 detecting the voltage of the power battery is connected to a pointing device control part 9. The pointing device control part 9 and a keyboard control part 8 control an alarm sound generation part 14. The pointing device control part 9 transfers power voltage information inputted from a power voltage detection part 13 to the keyboard control part 8. When power voltage is less than reference voltage, the pointing device control part 9 and the keyboard control part 8 execute a regular signal processing, drives the alarm sound generation part 14 in accordance with voltage information when an incorporated pointing device 4, an external pointing device 15 and a keyboard are operated, and a buzzer 6 issues alarm sound. |
