| 摘要 |
A group of control registers for controlling a plurality of input output devices respectively are formed in random access memory which is connected to a microprocessor bus of an input output control device. A history of a program mode access from a central processing apparatus to the RAM is recorded in a first-in first-out memory (FIFO). The microprocessor of the input output control device reads an access information of the FIFO, accesses the group of the control registers on the RAM, and controls the input output device according to the read control information. Thus, control of a plurality of input output devices is carried out by one input output device.
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