| 摘要 |
PURPOSE:To obtain input/output control information and output data having high maintainability by making peripheral control devices execute simultaneously an input/output control operation, collating its input/output control information and output data by an input/output device, and executing an actual operation only at the time of coincidence. CONSTITUTION:Two peripheral control devices execute simultaneously the same channel program from a central processor, input/output control information and output data which have arrived from a device interface are inputted to the first and the second buffers 14, 15 in the order of arrivals, and the contents of them are compared by a comparator 16. When the contents of both the buffers 14, 15 coincide, the contents of the first buffer 14 are sent out to a controlling circuit through a gate 17, and an actual input/output operation is executed. |
