| 摘要 |
PURPOSE:To reduce the load of a data processor by processing a processing request supplied from an input/output device by an input/output controller, and attaining a typical series of input/output controls through the input/output device with the input/output control of one time. CONSTITUTION:A main control part 21 waits for a notice about either the generation or non-generation of a processing request of an input/outut device 3 is informed from a processing request control part 25. Receiving the information on the non-generation of the processing request of the device 3 from a processing request detecting part 22, the part 21 controls an interface control part 26 to receive an answer message from the device 3 and to transfer the message to a data processor 1. Then the part 21 informs the processor 1 that the answer message is received by an interruption, and finishes the control to the device 3. Furthermore, the part 21 applies and interruption to the processor 1 after receiving the information of the generation of the processing request from the part 25 and reports that no answer message is received. Then, the control to the device 3 is closed. |
