Ncr Corporation

Rolf D Armstrong

Victor F Cole

Jon M Corcoran

A circuit for maintaining copies of original index registers and copies of modified index registers such that in the event original copies of the index registers are needed, they may be restored. The circuit is for use in a fault tolerant system wherein in the event of a rollback, original copies of the index registers may be restored to a processor, even if some of the index registers were modified in the previous execution of a command by the processor.

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Escondido, CA, United States of America

Rolf D Armstrong