International Business Machines Corporation

Clark J Spencer

Dale A Rickard

John Stanley Bialas, Jr

Daniel L Stanley

Johnny James LeBlanc

Timothy B Brodnax

Steven A King

A fault-tolerant computer system having shadow registers for storing the contents of a primary array into a shadow array at the completion of a stored instruction execution. This is accomplished in one clock cycle with all registers being shadowed simultaneously. During rollback of execution steps for a checkpoint retry, the shadow register files provide a signal cycle unload of the shadow array into the primary array. LSSD latches are used in the shadow register file.

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Praha, Czechoslovakia

Clark J Spencer