Chapter 7 & 8

Question 1

Logical Shift

Answer 1

Fills the newly created bit position with 0

Last bit shifted is moved into CF

Question 2

Arithmetic Shift

Answer 2

Fills the newly created bit position with a copy of the number’s sign bit

Last bit shifted is moved into CF

Question 3

SHL Instruction

Answer 3

Shift Left - performs a logical left shift on the destination operand, filling the lowest but with 0

Shifting left n bits multiplies the operand by 2^n

Question 4

SHR Instruction

Answer 4

Shift Right - performs a logical right shift on the destination operand

The highest bit position is filled with a 0

Shifting right n bits divides the operand by 2^n

Question 5

SAL Instruction

Answer 5

Identical to SHL

Question 6

SAR Instruction

Answer 6

Shift Arithmetic Right - performs an arithmetic shift on the destination operand

Preserves sign

Question 7

ROL Instruction

Answer 7

Rotate/shifts each bit to the left

Highest bit is copied into the CF and into the lowest bit

Question 8

ROR Instruction

Answer 8

Rotate/shifts each bit to the right

Lowest bit copied into both the CF and into the highest bit

Question 9

RCL Instruction

Answer 9

Rotate Carry Left

Copies the CF to the LSB

Copies the MSB to the CF

Question 10

RCR Instruction

Answer 10

Rotate Carry Right

Copies the CF to the MSB
Copies the LSB to the CF

Question 11

SHLD Instruction

Answer 11

Shifts destination operand a given number of bits to the left

Syntax:
SHLD destination, source, count

Question 12

SHRD Instruction

Answer 12

Shifts destination operand a given number of bits to the right

Syntax:
SHRD destination, source, count

Question 13

MUL Instruction

Answer 13

Multiplies an 8,16, or 32-bit operand by AL, AX or EAX

Product - AX, DX:AX, or EDX:EAX

Question 14

IMUL Instruction

Answer 14

Signed integer multiplication

Question 15

DIV Instruction

Answer 15

Performs 8,16, or 32-bit division on unsigned integers

Dividend - AX, DX:AX, EDX:EAX
Divisor - operand
Quotient - AL, AX, EAX
Remainder - AH, DX, EDX

Question 16

IDIV Instruction

Answer 16

Signed Integer Division

Question 17

CBD, CWD, CDQ

Answer 17

Convert BYTE to WORD
Convert WORD to DWORD
Convert DWORD to QWORD

Question 18

ADC Instruction

Answer 18

Add with carry

• adds source and the contents of the CF to destination operand

Question 19

SBB Instruction

Answer 19

Subtract with borrow

• subtracts both a source operand and the value of the CF from a destination operand

Question 20

BCD

Answer 20

Binary Coded Decimal

• integers which use 4 binary bits to represent each decimal digit

Question 21

Unpacked BCD

Answer 21

Stores a decimal digit in the lower 4 bits of each byte

Hex ex: 5678 is stored as 05 06 07 08

Question 22

AAA Instruction

Answer 22

ASCII adjust after addition

Question 23

AAS Instruction

Answer 23

ASCII adjust after subtraction

Question 24

AAM Instruction

Answer 24

ASCII adjust after multiplication

Question 25

AAD Instruction

Answer 25

ASCII adjust before division

Question 26

Packed BCD

Answer 26

AKA packed decimal format - stores 2 decimal digits per byte Ex: 12345678d -> hex 12 34 56 78

Question 27

DAA Instruction

Answer 27

Decimal adjust after addition

Question 28

DAS Instruction

Answer 28

Decimal adjust after subtraction

Question 29

What is another name for Stack Frame?

Answer 29

Activation record

Question 30

LEA Instruction

Answer 30

Load Effective Address - returns offsets of direct and indirect operands

Question 31

OFFSET Operator

Answer 31

Returns constant offsets

Question 32

Enter Instruction

Answer 32

Creates stack frame for a called procedure

Question 33

LEAVE Instruction

Answer 33

Terminated the stack frame for a procedure

Question 34

LOCAL Directive

Answer 34

Declares a list of local variables - immediately follows the PROC directive Ex: mySub PROC LOCAL var1:BYTE,var2:WORD

Question 35

WriteStackFrame Procedure

Answer 35

Displays contents of current stack frame

Question 36

ADDR Operator

Answer 36

Returns a pointer to a variable

Question 37

PROTO Directive

Answer 37

Creates a procedure prototype - every procedure called by INVOKE must have a PROTO Syntax: Label PROTO paramList

Question 38

Java Virtual Machine (JVM)

Answer 38

Executes compiled bytecodes Machine language of compiled Java programs