题目内容

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

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In simple interrupt processing, how does the processor get the interrupt number? ___________

A. Issue acknowledgement of interrupt
B. Load new PC value based on interrupt
C. Restore process state information
D. Receive interrupt request signal

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Having checked the Interrupt Request Signal from I/O module, CPU sends back Interrupt Acknowledgment signal to the module to __________.

A. let the module remove the Request Signal
B. let the module put the “vector” on data bus
C. let the module send PC value to CPU
D. A and B

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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

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? ____________.

In simple interrupt processing, how does the processor get the interrupt number? ___________

Having checked the Interrupt Request Signal from I/O module, CPU sends back Interrupt Acknowledgment signal to the module to __________.

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