Question 1

Which ofthe following represents 1001 0001? (Assume the MSB is on the left.)

- Unsigned number 17
- Sign-magnitude number-17
- Hexadecimal number 11
- Two's complement signed number 145

Question 2

Which ofthe following is the 8-bit two's complement representation for -28? (For the numbers given below, assume the MSB is on the left.)

- 1100 0010

- 1110 0100

- 0001 1100

- 1110 0011

Question 3

This question is based on the course simulated processor. Figure 1 shows a program segment and the memory contents before the program segment is executed. Assume all registers are set to zero before the first instruction.

MOVE.L ;41001. AO

MOVE.B 4^-$12, DO

ADD.B (A0)-1-. DO

MOVE.L S1000., D1

SUB.B 41, D1

MOVE.L Di, $1000

STOP AS2700

All numeric values are in Hexadecimal

Figure 1

What is the content of Register DO when the program stops?
- 1122 3344 (hex)
- 1122 3334 (hex)
- 0000 0012 (hex)
- 0000 0034 (hex)

Question 4

Which of the following characteristic(s) distinguish memory mapped I/O from isolated I/O?

- Memory mapped I/O requires less internal logic and is thus cheaper, faster and easier to build.

- Memory mapped I/O has a large set of different instructions for referencing memory.

- Memory mapped I/O requires a bigger address decoder_

- All of the above

Question 5

The system bus is made up of

- data bus and address bus
- data bus and control bus
- address bus and control bus
- data bus, control bus and address bus

Question 6

Which of the following is the product of 1011 and 1100? (Assume the MSB is on the left.)

- 0000 0100

- 0000 1000

- 1000 0100

- 1000 1000

Question 7

Which of the following is the decimal value for hexadecimal DC?
- 92
- 92
- 220
- 1312

Question 8

During which CPU cycle is an instruction moved from primary storage to the control unit?

- Access

- Refresh

- Fetch

- Execute

Question 9

Clock speed is measured in _____

- bits per second

- baud

- bytes

- Hertz

Question 10 

This question is based on the course simulated processor. Figure 1 shows a program segment and the memory contents before the program segment is executed. Assume all registers are set to-zero before the first instruction.

MOVEL $ 1 0 1, AO

MOVE $12, DO

ADD_B (AO)+, DO

MOVEL $1000, D1

SURB #$1, D1

MOVEL D1, $1000

STOP #$2700

All numeric values are in Hexadecimal

Figure 1

What is the content of memory location at address 001003 (hexadecimal) when the program stops?
- 10 (hex)
- 11 (hex)
- 43 (hex)
- 44 (hex)

Question 11

Status register is also known as

- Accumulator

- Stack

- Program Counter

- Flags

Question 12 

The Arithmetic Logic Unit (ALU) of the CPU is used to

- control the internal operation of the CPU

- determine whether a program is able to be executed

- carry out basic addition, subtraction and BOOLEAN operations 

- transfer data in the CPU's registers to the memory

Question 13 

Where does the control unit look in order to find the address of the next instruction to be fetched?

- Accumulator (AC)

- Instruction Register (IR)

- Memory Buffer Register (MBR)

- Program Counter (PC)

Question 14 

Part of the operating system is usually stored in Read-Only Memory (ROM) so that it can be used to boot up the computer. ROM is used rather than Random Access Memory (RAM) because

- ROM chips are faster than RAM

- ROM chips are not volatile

- ROM chips are cheaper than RAM chips

- None of the above

Question 15

This question is based on the course simulated processor. Figure 1 shows a program segment and the memory contents before the program segment is executed. Assume all registers are set to zero before the first instruction.

MOVE_L 44S1001, AO

MOVE_13 1412, DO

ADD.B (AO)+, DO

MOVE.L $1000, DI

SUB.B #$1, DI

MOVE_L D1, $1000

STOP #$2700

What is the content of Register D1 when the program stops?
- 1122 3344 (hex)
- 1122 3343 (hex)
- 0000 0010 (hex)
- 0000 0011 (hex)

Question 16 

A memory chip has 8 data lines and 9 address lines. How many bytes of data can be stored on the chip?

- 256
- 500
- 511
- 512

Question 17 

Which of the following is NOT a characteristic of the high performance bus architecture?

- Has different buses to cater to different speed I/O devices
- Changes in processor architecture do not affect bus architecture
- Allow high speed I/O devices to be processor
- Allow memory expansion

Question 18

An interrupt instruction _____.

- causes a conditional transfer of control

- causes an unconditional transfer of control

- modifies the status register

- is an I/O instruction

Question 19

This question is based on the course simulated processor. Figure 1 shows a program segment and the memory contents before the program segment is executed. Assume all registers are set to zero before the first instruction.

MOVE #$1001, AO

MOVES #$12, DO

ADD.B (AO)+, DO

MONTI $1000, D1

SUB.B #$1, D1

MOVE_L Dl. $1000

STOP 0$2700

All numeric values are in Hexadecimal

- What is the content of Register AO when the program stops?

- 001000 (hex)

- 001001 (hex)

- 001002 (hex)

- 001003 (hex)

Question 20:

Which of the following is the fixed point binary equivalent for 14.625? (For the numbers given below, assume the MSB is on the left.)

- 1110.1010

- 1110.1100

- 0111.1010

- None of the above