| 摘要 |
PURPOSE:To take a countermeasure against a fault by providing at least a storage circuit between common storage devices which are used in common by plural information processors, and transferring data to the storage devices from the storage circuit by a command of the information processor. CONSTITUTION:A storage device 1 is used in common by information processors 2 and 3 via a storage circuit 4. The processor 2 transmits the replacement information via a data signal line 24a and stores it temporarily in a storage circuit 4. When the transmission of the replacement information is finished, the data of the circuit 4 is written to the device 1 by a write indication signal line 24b and a data signal line 41a. If a fault arises during the data transfer from the processor 2 to the circuit 4, no incomplete replacement data is written to the device 1 unless the line 24b delivers no output. As a result, the data obtained before replacement remains at the device 1. This facilitates easy succession to the processor 3. |
