| 摘要 |
PURPOSE:To simplify the processing of an arithmetic processor by allowing only an I/O device in a driven state to write input data in an I/O data storing area of a storage device to be accessed by the arithmetic processor. CONSTITUTION:The I/O data of only the I/O device in the driven state out of the duplicated I/O devices 4, 5 are stored in the I/O data storing area 3a included in the storage device 3, and at the time of executing data access from the arithmetic processor 1, the area 3a of the device 3 is accessed. Since the I/O data can surely be accessed without deciding the I/O device in the driven state, the driven state deciding processing of the processor 1 can be omitted and the whole processing can be simplified. |
