Test #4

Question 1

Our Basic Computer has five types of machine instructions

Answer 1

False

Question 2

The program counter (PC) register in our Basic Computer is 16 bits in length and hold the address of the next instruction to be executed

Answer 2

False

Question 3

Which of the following are registers in the Basic Computer? Select all that apply

AC
BC
IR
AR
DR

Answer 3

AC
IR
AR
DR

Question 4

Which of the following are addressing modes on the Basic Computer? Select all that apply

Alternative
Direct
Linked
Indirect
Batch

Answer 4

Direct
Indirect

Question 5

Recursive subroutines are supported on the Basic Computer

Answer 5

False

Question 6

Which machine instruction on our Basic Computer is used for branching to a subroutine?

BUN
ISZ
LDA
CLA
BSA

Answer 6

BSA

Question 7

When a key on the keyboard of our Basic Computer is pressed, an interrupt cycle will always take place.

Answer 7

False

Question 8

When an interrupt cycle occurs, where is the return address stored?
Word 1
PC
AR
Word 0
Word 1

Answer 8

Word 0

Question 9

For register-reference instructions, the I bit (bit 15) of the instruction specifies the type of addressing that is being used

Answer 9

False

Question 10

The timing signals T0, T1, T2, … in our Basic Computer are generated using which of the following? Select all that apply

8x1 multiplexer
4-bit sequence counter
1x8 demultiplexer
4 bit adder
4x16 decoder

Answer 10

4-bit sequence counter
4x16 decoder

Question 11

Our Basic Computer has a 12-bit data bus that allows for transfer of data from one register to another

Answer 11

False

Question 12

To perform a memory read/write operation on our Basic Computer, the address of the memory word involved must be placed in the Data Register

Answer 12

False

Question 13

Which of the following are True concerning the I/O process on our Basic Computer? Select all that apply

FGO must = 1 for INPR contents to be transferred to AC

FGI must = 0 for keystroke to be transferred to INPR

The data transfer from OUTR to printer is serial

Flags FGI and FGO determine when data can be transferred

I/O must be done under program control

Answer 13

FGI must = 0 for keystroke to be transferred to INPR

The data transfer from OUTR to printer is serial

Flags FGI and FGO determine when data can be transferred

Question 14

Execution of a machine instruction on our Basic Computer always begins at timing pulse T4

Answer 14

False

Question 15

Suppose the “BSA $156” instruction is found in memory of our Basic Computer at memory location $03F. Assume this instruction has just executed. What value was stored in memory location $156 during the execution of this instruction?

$03F
$156
$160
$040
$050

Answer 15

$040

Question 16

Our Basic Computer has over 40 different machine instructions

Answer 16

False

Question 17

Suppose you want to create a counted loop in the machine language of our Basic Computer. What machine instruction is used to help create this loop?

BSA
LDA
CIR
ISZ
INP

Answer 17

ISZ

Question 18

Suppose you want to create a counted loop that loops 5 times in the machine language of our Basic Computer. This requires a counter to be set up in a memory location. What should the value of the counter be?

5
10
12
-10
-5

Answer 18

-5

Question 19

The following two microoperations can be done simultaneously on our Basic Computer:

AC <- DR, DR <- AC

Answer 19

True

Question 20

The following operation can be done as a single microoperation on our Basic Computer:

PC <- AR + 1

Answer 20

False

Question 21

The instruction $8500 in our Basic Computer specifies an ADD instruction using indirect addressing

Answer 21

False

Question 22

Which of the following statement must be TRUE for the Interrupt Cycle to occur on our Basic Computer?

IEN must be set to 1
FGI or FGO (or both) must be 1
INPR must be 1
R must be 1
OUTR must be 1

Answer 22

IEN must be set to 1
FGI or FGO (or both) must be 1
R must be 1

Question 23

When the Interrupt Cycle occurs on our Basic Computer, the return address is stored in the special memory location $100

Answer 23

False

Question 24

At each timing pulse T0, our Basic Computer enters either the Fetch Cycle or the Interrupt Cycle

Answer 24

True

Question 25

What machine instruction on our basic computer is used to return from a subroutine?
BSA
ISZ
LDA
STA
BUN

Answer 25

BUN

Question 26

There is only one way to handle I/O on our Basic Computer: through Program Control I/O

Answer 26

False

Question 27

While our Basic Computer is executing a subroutine, an Iterrupt Cycle can never occur

Answer 27

False

Question 28

A second Interrupt Cycle can occur during the execution of the I/O Interrupt program

Answer 28

False

Question 29

Which of the following values are found in the Control Unit of our Basic Computer? Select all that apply

Timing pulses T0 - T15
Indirect Bit
D0 - D7 to indicate op code
AC
PC

Answer 29

Timing pulses T0 - T15
Indirect Bit
D0 - D7 to indicate op code

Question 30

One difference between a subroutine call (BSA) and an Interrupt Cycle on our Basic Computer is where the return address is stored.

Answer 30

True

Question 31

Even though there is not a machine instruction on our Basic Computer to perform the logical OR operation on two 16-bit words, this can be done through multiple machine instructions.

Answer 31

True

Question 32

Automation can eliminate certain jobs, but may also create new jobs

Answer 32

True

Question 33

Uber drivers are a perfect example of the Gig economy

Answer 33

True

Question 34

The idea of net neutrality says that all Internet packets should be treated the same

Answer 34

True

Question 35

The Digital Divide refers to the situation where some people have access to modern information technology while others do not

Answer 35

True

Question 36

It is possible to transfer the contents of DR directly to AC register over the main data bus of the Basic Computer.

Answer 36

False

Question 37

A machine instruction on our Basic Computer with an op-code in the range 0-6 is a memory-reference instruction.

Answer 37

True

Question 38

Our Basic Computer has a built-in machine instruction that performs subtraction.

Answer 38

False