Computer work saving during power interruption

Details Computer work saving during power interruption Computer work saving during power interruption

1990-10-17

1993-03-09

Beausoliel, Jr., Robert W.

Excavating

371 66, G06F 1100, G06F 1130

Patent

active

051931761

ABSTRACT:
A computer having both volatile and nonvolatile memory, and which is operative in response to a system program and an application program, is protected against an interruption of a primary power source by a momentary introduction of power from a backup source, and by a freezing of data and program instructions in effect at the time of the power interruption. A backup region is designated within the nonvolatile storage medium for receipt of data and instructions present in the nonvolatile memory upon the occurrence of a power interruption. Circuitry is provided for sensing the interruption, the circuitry including the implementation of a computer program which directs cessation of further operation of the application program followed by a transfer of data and instructions from the volatile memory to the nonvolatile memory. This transfer is done under backup power. Thereupon, the backup power is discontinued and the computer is shut down. Subsequently, after resumption of primary power and, upon request of an operator of the computer, the data and the instructions are returned from the nonvolatile memory to the volatile memory, and running of the application program is resumed from the stage at which it had been previously frozen.

REFERENCES:
patent: 4327410 (1982-04-01), Patel
patent: 4458307 (1984-07-01), McAnlis
patent: 4757505 (1988-07-01), Marrington
patent: 4812677 (1989-03-01), Perry
patent: 4907150 (1990-03-01), Arroyo
patent: 4959774 (1990-09-01), Davis
patent: 5012406 (1991-04-01), Martin

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