Quiz 11: The Last Quiz				      Name:

1. Which of the following is the fastest I/O technique
a. DMA
b. Interrupt Driven I/O
c. Programmed I/O (Polling)
d. These are not I/O techniques

2. Which of the following apply to polling ? (Pick all correct answers)
a. It wastes CPU resources
b. It is very simple to implement
c. It is really useful for I/O devices like disks
d. It is the fastes I/O technique

3. What is an interrupt ?
a. An unscheduled procedure call
b. An unscheduled instruction
c. A hardware mechanism to delay instructions
d. None of the above

4. Which of the following activities are handled by interrupts ?
a. Pressing a keyboard key
b. Mouse Clicks
c. Your computer clock
d. Executing instructions on the computer

5. Which is an advantage of the Daisy-Chaining arbitration scheme ?
a. It requires just one request line and one grant line
b. It allows us to program the priority of different devices
c. Each device gets access to the bus at the same priority level
d. It requires a large number of lines

The next five questions cover ALL topics so far...but relax, they're easy !
Q6,7: if A=0x3A, B=0xAB
6. What is A & B, A | B, A ^ B ?
a. 0x2A, 0xBB, 0x91
b. 0x2A, 0xBA, 0x92
c. 0x2B, 0xBB, 0x91
d. 0x2B, 0xBA, 0x91

7. What is B-A ?
a. 0x70
b. 0x71
c. 0x72
d. 0x73

8. Which registers are associated with stack addressing ?
a. $ra,$sp
b. $sp,$fp
c. $fp,$sp
d. $0,$sp

9. Which device is a memory elements in digital logic ? (Can store a bit)
a. AND gates
b. Flip-Flops
c. NAND gates
d. Inverters

10. Which of the following is NOT a state in digital logic ?
a. 0
b. 1
c. Z
d. A