Question 19

Which the combination of the terms below is most appropriate for the following descriptions (1) through (3) of input/output control ?

(1) Data is transferred between the main memory unit and the input/output unit via registers of the processor.
(2) Data is transferred between the main memory unit and the input/output unit directly via special hardware dedicated for data transfer connected in most cases to the system bus, bypassing the processor.
(3) This is a type of method (2) With this method, hardware especially dedicated for input/output operations autonomously reads programs for data transfer controls from the main memory, and controls the input/output units, enabling an increase in the degree of parallel processing.

  (1) (2) (3)
a) Pipeline control method DMA control method Channel control method
b) Pipeline control method Channel control method DMA control method
c) Program control method DMA control method Channel control method
d) Program control method Channel control method DMA control method

answer

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