Assembler Directives, Interrupts

Question 1

It controls the assembly process.

Answer 1

assembler directives

Question 2

It indicates how an operand or section of a program is to be processed by the assembler.

Answer 2

directives

Question 3

These are designed to create the required data and perform all appropriate memory allocation and data formatting for little – endian values.

Answer 3

assembler directives

Question 4

These are set of instructions to answer a specific problem.

Answer 4

program

Question 5

A specific directive that can be used to assign a value to a constant variable.

Answer 5

define

Question 6

indicates the start of the segment and its symbolic name

Answer 6

segment

Question 7

indicate the end of the segment

Answer 7

ends

Question 8

used for memory reservation, the assembler stores a zero into locations specified by this

Answer 8

?

Question 9

A specific directive that creates an array.

Answer 9

dup

Question 10

A specific directive that repeats an expression a given number of times.

Answer 10

dup

Question 11

A directive that forces the assembler to align the next segment at an address divisible by specified divisor.

Answer 11

align

Question 12

Used to start the data segment on word boundary

Answer 12

align 2

Question 13

Used to start the data segment on doubleword boundary

Answer 13

align 4

Question 14

A specific directive that is used to give a name to some value or symbol.

Answer 14

equ

Question 15

assign either a byte or a word address to a label

Answer 15

this

Question 16

A specific derivative that changes the starting offset address of the data in the data segment.

Answer 16

org

Question 17

A specific directive that is similar to an alias of a segment.

Answer 17

assume

Question 18

A specific directive that tells the assembler what names have been chosen for the segments.

Answer 18

assume

Question 19

A specific directive that indicates the start of the procedure

Answer 19

proc

Question 20

A specific directive that indicates the end of the procedure

Answer 20

endp

Question 21

A procedure that resides in the same code segment as the program (local).

Answer 21

near (procedure)

Question 22

A procedure that may reside at any location in the memory system (global).

Answer 22

far (procedure)

Question 23

A specific directive that indicates which registers are used by the procedure.

Answer 23

uses

Question 24

A specific derivative that initializes memory model before defining any segment

Answer 24

.model

Question 25

Requires that all software and data fit into one 64K-byte memory segment, useful for many small programs

Answer 25

tiny (model)

Question 26

Requires that only one data segment be used with one code segment, for a total of 128K-bytes of memory.

Answer 26

small (model)

Question 27

A specific derivative that returns to DOS but error code is not defined.

Answer 27

.exit

Question 28

A specific derivative that returns to DOS with an error code 0.

Answer 28

.exit 0

Question 29

A specific directive that temporarily suspends execution of the main program.

Answer 29

interrupts

Question 30

An interrupt that generated by changing the logic levels of either the processor's hardware interrupt inputs.

Answer 30

External Hardware Interrupts

Question 31

An interrupt that cannot be ignored by the CPU.

Answer 31

Nonmaskable interrupt (NMI)

Question 32

An interrupt that can be enabled or disabled by the state of the interrupt.

Answer 32

interrupt request (INTR/IRQ)

Question 33

An interrupt that is generated directly by an executing program

Answer 33

Internal software interrupts (exceptions)

Question 34

These are instructions executed during the normal program flow.

Answer 34

INT INTO (Interrupt on Overflow)

Question 35

It happens when division by zero is detected in the execution unit

Answer 35

DIV IDIV

Question 36

The lowest priority interrupt.

Answer 36

single-step

Question 37

The highest priority interrupt.

Answer 37

Divide by zero (Divide - error)

Question 38

Interrupt Priority

Answer 38

Divide - error INT, INTO NMI INTR single-step

Question 39

A dedicated table in memory used for storage of their interrupt service routine (ISR) starting address.

Answer 39

Interrupt Vector Table

Question 40

In protected mode, an _____________________ that uses 8-byte descriptors to describe each of the interrupts replaces the vector table.

Answer 40

interrupt descriptor table

Question 41

A program that tells the processor what to do when the interrupt occurs.

Answer 41

Interrupt service request