ITEC 625 Week 7 Questions and Answers (UMUC)

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ITEC 625 Week 7 Questions and Answers (UMUC)

1. Why would DMA be useless if the computer did not have interrupt capability?

Without Interrupts the CPU would not be able to know of DMA status or completion of action.

2

9.7    What is polling used for? What are the disadvantages of polling? What is a better way
to perform the same job?”
 (Englander 293)

3. (Hint: Is DMA reallly useless in this situation?)

9.1    Why would DMA be useless if the computer did not have interrupt capability?”
 (Englander 293)

4.

9.4    Consider the interrupt that occurs at the completion of a disk transfer.
a.    “Who” is interrupting “whom”? b.    Why is the interrupt used in this case? What would be necessary if there were nointerrupt capability on this computer? c.    Describe the steps that take place after the interrupt occurs.”
 (Englander 293)