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
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
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
The address of the top of stack is stored in register.
A. PC
B. AC
C. SP
D. PSW
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