超星 - Second homework

单选题

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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单选题

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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单选题

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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单选题

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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单选题

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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单选题

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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单选题

Comparing with programmed I/O, interrupt-driven I/O 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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单选题

In DMA, when does DMA module issue interrupt request signal to CPU?

A. before DMA module transfers a block data
B. after DMA module finishes a block data transfer
C. before DMA module seizes to use bus
D. after DMA module ends to seize bus

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单选题

The address of the top of stack is stored in register.

A. PC
B. AC
C. SP
D. PSW

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单选题

The interrupt request signal is send fromto.

A. CPU,I/O module
B. I/O module,CPU
CPU,memory
D. memory,CPU

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