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power-fail recovery

power-fail recovery A method of dealing with the effects of a loss of the incoming power supply. The system is equipped with a power-line monitor, which detects any long-term deviation in the supply-line voltage from acceptable limits, and causes a power-fail interrupt when deviations occur. The service routine for this interrupt stores the process descriptors for all processes in nonvolatile memory and then halts all activity. When the supply-line voltage is restored, the system restarts and can reinstate all processes from the previously stored process descriptors.

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