题目内容

Transfer data with I/O modules, 3 types of techniques can be used. Which doesn’t belong to them? _______.

A. Interrupt-driven I/O
B. Programmed I/O
C. Direct I/O access
DMA

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Which I/O technique should be taken to output a data block of some sectors to hard disk? ___________

A. Interrupt-driven I/O
B. Programmed I/O
C. Direct I/O access
DMA

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Which I/O technique should be taken to input a word from keyboard? __________

A. Interrupt-driven I/O
B. Programmed I/O
C. DMA
Direct I/O access

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Comparing with interrupt-driven I/O, DMA further raises the usage rate of CPU operations, because __________

A. it isn’t necessary for CPU to save and restore scene
B. it isn’t necessary for CPU to intervene the dada transfer
C. it isn't necessary for CPU to read and check status repeatedly
D. both A and B

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Transfer data with I/O modules, 3 types of techniques can be used. Which isn’t necessary for CPU to intervene the dada transfer? ____________.

A. Interrupt-driven I/O
B. Programmed I/O
C. Direct I/O access
DMA

查看答案

Transfer data with I/O modules, 3 types of techniques can be used. Which doesn’t belong to them? _______.

A. Interrupt-driven I/O B. Programmed I/O C. Direct I/O access DMA

Which I/O technique should be taken to output a data block of some sectors to hard disk? ___________

Which I/O technique should be taken to input a word from keyboard? __________

Comparing with interrupt-driven I/O, DMA further raises the usage rate of CPU operations, because __________

Transfer data with I/O modules, 3 types of techniques can be used. Which isn’t necessary for CPU to intervene the dada transfer? ____________.

A. Interrupt-driven I/O
B. Programmed I/O
C. Direct I/O access
DMA