Chapter 3

Question 1

What is AX

Answer 1

Accumulator register

Question 2

What is BX

Answer 2

Base register

Question 3

What is CX

Answer 3

Counter register

Question 4

What is DX

Answer 4

Destination register

Question 5

What is SI

Answer 5

Source index register (for memory reading)

Question 6

What is DI

Answer 6

Destination index register (for memory writing)

Question 7

What is IP

Answer 7

Instruction pointer register

Question 8

What is SP

Answer 8

Stack pointer register

Question 9

What is BP

Answer 9

Base pointer register

Question 10

What is C in flag register

Answer 10

Carry bit

Question 11

What is P in flag register

Answer 11

Parity bit

Question 12

What is A in flag register

Answer 12

auxiliary carry bit

Question 13

What is Z in flag register

Answer 13

Zero bit

Question 14

What is S in flag register

Answer 14

Sign bit

Question 15

What is T in flag register

Answer 15

Trap flag

Question 16

What is I in flag register

Answer 16

Interrupt flag

Question 17

What is D in flag register

Answer 17

Direction flag

Question 18

What is O in flag register

Answer 18

Overflow flag

Question 19

What is CS

Answer 19

Code segment register

Question 20

What is DS

Answer 20

Data segment register

Question 21

What is SS

Answer 21

Stack segment register

Question 22

What is ES

Answer 22

Extra segment register

Question 23

How we write Move 5 to AX in assembly

Answer 23

mov ax, 5
(Note: it is intel convention that it writes destination first and source in second) (syntax: instruction destination, source)

Question 24

How we write add BX to AX

Answer 24

add ax, bx

Note: it is intel convention that it writes destination first and source in second

Question 25

What is assembler of assembly language

Answer 25

NASM (Netwide assembler) by intel

Question 26

What is linking

Answer 26

Object code is not executable. We need to linking it to make it executable by linker. Alink is an open source linker for this purpose

Question 27

What does debugger do

Answer 27

It does debug on register level. We use AFD (Advance fullscreen debugging)

Question 28

What is opcode

Answer 28

Its a number translated from instruction for processor

Question 29

MSB to LSB called what notation

Answer 29

Little endian notation

Question 30

LSB to MSB called what notation

Answer 30

Big endian notation

Question 31

What is REGISTER ARCHITECTURE

Answer 31

The iAPX88 architecture consists of 14 registers.

Question 32

What is General Registers (AX, BX, CX, and DX)

Answer 32

The registers AX, BX, CX, and DX behave as general purpose registers in Intel architecture and do some specific functions in addition to it. X in their names stand for extended meaning 16bit registers.

Question 33

What is Stack Pointer (SP)

Answer 33

It is a memory pointer and is used indirectly by a set of instructions.

Question 34

What is Base Pointer (BP)

Answer 34

It is also a memory pointer containing the address in a special area of memory called the stack

Question 35

What are Segment Registers (CS, DS, SS, and ES)

Answer 35

The code segment register, data segment register, stack segment register, and the extra segment register are special registers related to the Intel segmented memory model.