Chapter 42

Question 1

What are 2 types of descriptors

Answer 1

• Global

- Local

Question 2

What is global descriptor

Answer 2

It is responsible for global memory

Question 3

What is local descriptor

Answer 3

It works for each process memory

Question 4

OS uses which descriptor

Answer 4

Global descriptor table

Question 5

What is size of base

Answer 5

32 bit

Question 6

What is size of limit

Answer 6

20 bit

Question 7

What is granularity

Answer 7

Granularity is usually used to characterize the level of detail in a set of data

Question 8

What is size of paragraph

Answer 8

16 byte

Question 9

What is size of page

Answer 9

4 kb

Question 10

What is vesa mode of graphic adapter

Answer 10

Video electronics standard organization is an extension of video BIOS for high resolution and high colors. Otherwise BIOS have black and white color.

Question 11

What is benefit of protected mode

Answer 11

Larger memory availability

Question 12

What are default colors of computer

Answer 12

RGB (red, green, blue) it is base of every color of computer

Question 13

What is size of veso

Answer 13

16 bit

Question 14

What is vesa extension

Answer 14

It is BIOS service to activate vesa. It is int 10 service

4F

Question 15

What are sub services of vesa

Answer 15

0 - Get superVGA information
1 - Get superVGA mode information
2 - Set superVGA video mode

Question 16

What is AL in vesa service

Answer 16

check for function support

Question 17

What is AH in vesa service

Answer 17

It shows status
0x00 = successful
0x01 = fail
0x02 = function not supported
0x03 = function invalid

Question 18

What is 16 bit formation

Answer 18

5:6:5
5 bits = red
6 bits = green
5 bits = blue

Question 19

What are 2 modes

Answer 19

• real

- protected