| 摘要 |
PURPOSE:To prevent the processing ability of a shared memory device from unnecessary deterioration by starting the execution of processing for electric power cut off first just after the access to the said device. CONSTITUTION:Supporsing that electric power is restored again after service interruption in a CMO system, a system supervisory unit 1 records the status of a backup battery in a battery status flag 4 in a control mechanism 7 and the fact of service interruption in a service interruption recording flag 5 through signal lines 2,3 connected to the shared memory/control mechanism 7. The control mechanism 7 sends the contents of the flags 4, 5 to a CPUO system first just after the access from the CPUO system to the CMO system through the signal line 8. The CPUO system checks the contents of the flags sent from the control mechanism 7, discriminates whether the contents of the CMO system memory device is damaged or not damaged and executes appropriate processing. |
