| 摘要 |
PROBLEM TO BE SOLVED: To provide a bus extension input/output adapter control system for data processor, with which an input/output device can be extended without changing an existent data processor having only one input/output interface slot and throughput pressure caused by the extension of the input/output device can be suppressed to a minimum when connecting plural input/output devices to the existent device. SOLUTION: This system is provided with a token sending means for permitting access from an input/output device, in-coming input/output bus for sending read/write information from each of input/output devices, out-going input/output bus for sending answer information and interruption information from a processor, FIFO (in-coming buffer) for sending to a processor bus, and FIFO (out-going buffer) for receiving from the processor bus and respectively between the input/ output device and an input/output adapter and between the input/output adapter and the processor, control is independently performed.
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