Nec Corporation

Nobuki Morita

Yoshiaki Sugiyama

Kazuhito Koguchi

Shinichi Nomiyama

In an information processing system comprising a plurality of processor units each of which comprises a memory unit, an execution processor, an information transfer unit, and a bus line connected to one another, the memory unit has a control information area and a data area for storing a control information signal and a main data signal, respectively, and a saving area for saving the main data signal which is stored as a copied signal of the data signal. When the copied signal is saved into the saving area, an information transfer unit receives, through the bus line, the main data signal which is read out of the memory unit and which is transferred to the other processor unit. An additional data signal is produced by the other processor unit and stored through the information transfer unit into the saving area. Inasmuch as both the main and the additional data signals are stored in each processor unit, each processor can take over processing carried out in the other processor unit when the other processor unit is faulty.

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Tokyo, Japan

Nobuki Morita