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. How many words are in the following memory?

12
4
3
6

2. Which control wire "turns on" memory?

MA
WR
neither

3. What must the value of the WR control wire be in order to fetch a word out of memory?

0
1

4. What do we call the four wires coming out of the decoder?

primary control wires
word select wires
row select wires
main horizontal wires

5. Which value shows up on the RO wires?

the word that was last fetch from memory when WR=0
if WR=0 then nothing but 0s
the word whose word-select wire is 1
random 1s and 0s

6. What are the wires called that tell the memory which word to read or write?

data wires
address wires
control wires

7. Which register acts as the communications buffer between the CPU's registers and the memory cells?

MAR
MBR
decoder

8. Besides the flip-flops of memory, to what other flip-flops does the MBR connect?

system registers
input/output devices
those of the MAR

9. Which wire below is the WR wire and which is the MBRLD?

X=MBRLD and Y=WR
X=WR and Y=MBRLD