Question 28 (2 points) Which one is an Asynchronous event? Question 28 options:

Question

Question 28 (2 points)

Which one is an Asynchronous event?

Question 28 options:

illegal operation code

divided by zero

keyboard stroking

emulated instructions

Question 29 (2 points)

Consider the following program:

100 ADD
101 NAND
102 LW
103 NAND
104 BEQ

Handler:

200 LW
201 SUB
...

an interrupt occurs when the processor is executing NAND instruction.
What is the PC value that needs to be preserved to resume this program after the interrupt?

Question 29 options:

100

104

102

101

Question 30 (2 points)

Consider the following program:

100 ADD
101 NAND
102 LW
103 NAND
104 BEQ

Handler:

1000 Save $k0
1001 Enable Interrupts
1002 Save processor Registers
...

1020 execute device code
....

1102 Restore processor registers
....
1120 restore $k0
1121 return to original program

an interrupt occurs when the processor is executing NAND instruction.
Assume that a second interrupt occurs at the instruction "restore $k0" (PC = 1120).
What is the memory address stored in $k0?

Question 30 options:

102

1120

1121

1001

Question 31 (2 points)

The role of ____________ is to balance the mix of processes in memory to avoid thrashing.

Question 31 options:

Loader

dispatcher

medium term scheduler

short term scheduler

illegal operation code

divided by zero

keyboard stroking

emulated instructions

Explanation / Answer

Question 28

And: keyboard striking.

Asynchronous events occurs independent of program.

Question 29

Ans: 104

Question 30:

Ans: 1001

Question 31:

Ans: dispatcher

Dispatcher is uses to balance process ellocation and avoids collision.

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