CONTROL METHOD FOR I/O DEVICES

摘要

The data transmission is accomplished by transfer from a main memory(1) to an I/O controller(51) through a channel controller(3) which provides responsing signal to the I/O controller in normal state. The provision of the responsing signal stops by error detection of channel controller and the I/O controller detects the absence of the responsing signal through a time interval supervising circuit positioned on a bus supervising circuit. Then, the faulty address and content of an I/O device(61) are reported to a CPU(2) through the channel controller.