题目内容

【单选题】 In the ( ) method to synchronize the operation of the CPU with the I/O device, the I/O device informs the CPU when it is ready for data transfer.

A. programmed I/O
B. interrupt-driven I/O
C. DMA
D. isolated I/O

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【单选题】 In the ( ) method to synchronize the operation of the CPU with the I/O device, the CPU is idle until the I/O operation is finished.

A. programmed I/O
B. interrupt-driven I/O
C. DMA
D. isolated I/O

【单选题】 In the ( ) method to synchronize the operation of the CPU with the I/O device, a large block of data can be passed from an I/O device to memory directly.

A. programmed I/O
B. interrupt-driven I/O
C. DMA
D. isolated I/O

【单选题】 The（）is a computer subsystem that performs operations on data.

A. CPU
B. memory
C. I/O hardware
D. none of the above

【单选题】 The data in（）are erased if the computer is powered down.

A. RAM
B. ROM
C. a tape drive
D. a CD-ROM