𝗖𝗵𝗮𝗽𝘁𝗲𝗿 𝟲: Program Control Instructions

Question 1

Allows the programmer to skip sections of a program and branch to any part of the memory for the next instruction.

Answer 1

Jump

Question 2

Allows the programmer to make decisions based upon numeric tests

Answer 2

Conditional Jump

Question 3

Is a 2-byte instruction that allows jumps or branches to memory locations within +127 and –128 bytes from the address following the jump.

Answer 3

Short Jump

Question 4

a 3-byte instruction that allows a branch or jump within ±32K bytes (or anywhere in the current code segment) from the instruction in the current code segment.

Answer 4

Near Jump

Question 5

A 5-byte instruction that allows a jump to any memory location within the real memory system

Answer 5

Far Jump

Question 6

Short and near jumps are often called as __________ jumps.

Answer 6

Intrasegment

Question 7

Far jumps are often called as __________ jumps.

Answer 7

Intersegment

Question 8

are called relative jumps because they can be moved, along with
their related software, to any location in the current code segment without a change

Answer 8

Short Jump

Question 9

also called displacement, follows the opcode

Answer 9

distance

Question 10

A symbolic name for a memory address

Answer 10

Label

Question 11

Is similar to the short jump, except that the distance is farther

Answer 11

Near Jump

Question 12

in 0200 R, the letter R denotes -

Answer 12

Relocatable Jump Address

Question 13

Obtains a new segment and offset address to accomplish the jump

Answer 13

Far Jump

Question 14

Another way to obtain a far jump is to define a label as a ______

Answer 14

Far Label

Question 15

Appear in programs that contain more than one program file

Answer 15

External Labels

Question 16

This symbol defines a label as global

Answer 16

double colon (LABEL::)

Question 17

The address of the
jump is in the register specified by the jump instruction.

Answer 17

Indirect Jump

Question 18

indirect jump
indirect jump

Answer 18

double-indirect jump

Question 19

Instructions that set a byte to either 01H or clear a byte to 00H, depending on the outcome of the condition under test

Answer 19

Conditional Set

Question 20

is a combination of a decrement CX and the JNZ conditional jump

Answer 20

Loop

Question 21

.command

Answer 21

dot commands

Question 22

Directive that causes all assembler generated statements to be listed, including the label @Startup generated by the .STARTUP
directive

Answer 22

.LISTALL

Question 23

is used with a condition to begin the loop, and the .ENDW statement ends the loop

Answer 23

.WHILE statement

Question 24

is often followed by the .IF statement to select the break
condition

Answer 24

.BREAK

Question 25

Can be used to allow the DO–.WHILE loop to continue if a certain condition is met

Answer 25

.CONTINUE

Question 26

A series of instructions is repeated until some condition occurs

Answer 26

REPEAT-UNTIL

Question 27

is a group of instructions that usually performs one task

Answer 27

Procedure

Question 28

is a reusable section of the software that is stored in memory once, but used as often as necessary

Answer 28

Procedure

Question 29

instruction that links to the procedure

Answer 29

CALL

Question 30

instruction that return from the procedure

Answer 30

RET

Question 31

pushes the address of the instruction

Answer 31

CALL

Question 32

removes an address from the stack so the program returns to the instruction following the CALL.

Answer 32

RET

Question 33

transfers the flow of the program to the procedure

Answer 33

CALL

Question 34

is like a far jump because it can call a procedure stored in any memory location in the system

Answer 34

Far Call

Question 35

removes a 16-bit number

Answer 35

Near return

Question 36

removes a 32-bit number

Answer 36

Far Return

Question 37

is either a hardware-generated CALL or a software-generated CALL

Answer 37

Interrupt

Question 38

externally derived from a hardware signal

Answer 38

hardware-generated CALL

Question 39

internally derived from the execution of an instruction or by some other internal event

Answer 39

software-generated CALL

Question 40

is a 4-byte number stored in the first 1024 bytes of the memory when the microprocessor operates in the real mode

Answer 40

Interrupt Vector

Question 41

How many different interrupt vectors

Answer 41

256

Question 42

At times, an internal interrupt is called a/n __________

Answer 42

exception

Question 43

Either type interrupts the program by calling a/n ________

Answer 43

interrupt service procedure (ISP)

Question 44

Is used only with software or hardware interrupt service procedures

Answer 44

Interrupt Return (IRET)

Question 45

is a special software interrupt designed to function as a breakpoint

Answer 45

INT 3

Question 46

is a conditional software interrupt that tests the overflow flag

Answer 46

INTO

Question 47

Places a 1 into the I flag bit, which enables the INTR pin

Answer 47

Set Interrupt Flag (STI)

Question 48

Places a 0 into the I flag bit, which disables the INTR pin.

Answer 48

Clear Interrupt Flag

Question 49

Propagates the carry or borrow in multiple-word/doubleword addition and subtraction

Answer 49

Carry Flag

Question 50

Monitors the hardware BUSY pin on the 80286 and 80386, and the TEST pin on the 8086/8088

Answer 50

WAIT

Question 51

Stops the execution of software

Answer 51

Halt (HLT)

Question 52

When the microprocessor encounters this instruction, it takes a short time to execute

Answer 52

No Operation (NOP)

Question 53

appends an instruction and causes the LOCK pin to become a logic 0

Answer 53

Lock Prefix

Question 54

passes instructions to the floating-point coprocessor from the microprocessor

Answer 54

Escape (ESC)

Question 55

first made available in the 80186 microprocessor, is a comparison instruction that may cause an interrupt

Answer 55

BOUND

Question 56

first made available to the 80186 microprocessor, are used with stack frames, which are mechanisms used to pass parameters to a procedure through the stack memory

Answer 56

ENTER and LEAVE