| 摘要 |
PROBLEM TO BE SOLVED: To lower overrun probability. SOLUTION: This device has a register 6 for storing reply data from a main storage device 2, a register 9 for storing these reply data, a register 8 for storing an operating instruction signal from a microprogram control part 5, a selector 12 for selecting one of registers 6, 8 and 9 and a priority discriminating circuit 11 for receiving a control signal from the microprogram control part 5 and generating a priority select signal and applying it to the selector 12. When the priority select signal is received, the operating instruction signal in the register 8 is selected and applied to a channel device 3 by the selector 12, afterwards, the reply data in the register 9 are selected and applied to the channel device 3, and otherwise, the reply data in the register 8 are selected and applied to the channel device 3.
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