| 摘要 |
PURPOSE:To prevent a useless operation of an equipment by setting each bit of an equipment control register held by a power source unit to an equipment OFF state, when feed from an uninterruprive power supply system is stopped. CONSTITUTION:A state of an equipment control register 4 for storing a control signal to an equipment as a bit train is held even at the time of service interruption by feed from a power source unit 12. A service interruption detecting circuit 6 monitors whether an output of the power source unit 12 for receiving power source supply from one of an uninterruptive power supply system 8 and a commercial power source 9 exists or not, and sends out a reset signal SR to a reset circuit 7, when the output from the power source unit 12 becomes a disconnected state. The reset circuit 7 resets forcibly each bit of the equipment control register 4 to an equipment OFF state, based on the reset signal SR from the service interruption detecting circuit 6. Accordingly, it can be prevented that a useless state is generated due to a fact that only the equipment is operated, although the computer main body is not operated. |
