DIRECTIONS: Read each question carefully. Then click on the dot next to the answer that most closely fits the question. Try to answer all questions on this quiz and when you are done, click on the grade me button at the bottom.

1. Which of the following notations denotes only 1 physical wire?

2. What do we call the inputs to a mux?

windows
ports
entries
wires

3. What happens when PC-INCR is set to 1?

the value in PC goes up by 1
the value in PC goes up by 1 if PC-LD is also 1
the value in PC is set to 0000000000000001
the value in PC is set to all zeros

4. Since PC has 16 bits, how long can a program in the CSC-1 be?

65536 words
65535 words
4096 words since that is the maximum size of memory
there is no limit since virtual memory is used

5. Which register in the CSC-1 is only 12 bits wide?

MAR
MBR
PC
S

6. What does the following notation mean?
   

the top 8 bits are all zeroed out as they go into the instruction decoder
the instruction decoder is only 8 bits wide
the IR register only contains 8 bits
only the 8 most significant bits go from the IR into the instruction decoder

7. Which of these operations is not performed by the ALU in the CSC-1?

not TMP
-A
A or TMP
identity TMP

8. The shifter is controlled by two bits S1 and S2. How many different functions does the CSC-1 shifter perform?

3
2
4
8

9. When we write MAR-MUX=2 or MAR-MUX=10₂, what we mean is...

MAR-MUX1=1 and MAR-MUX0=0
MAR-MUX0=1 and MAR-MUX1=0
MAR gets the value 000000000010 (which is 2)
both input wires to the MAR's MUX are high

10. Which of the four condition bits coming out of the ALU indicates that the 2's complement result was too big for the A register to hold?

C
N
Z
V

11. Which wire is the least significant bit (LSB) of the IR?

IR-OUT0
IR-OUT1
IR-OUT11
IR-OUT15