Chapter 42 Flashcards Preview

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Flashcards in Chapter 42 Deck (19)
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1
Q

What are 2 types of descriptors

A
  • Global

- Local

2
Q

What is global descriptor

A

It is responsible for global memory

3
Q

What is local descriptor

A

It works for each process memory

4
Q

OS uses which descriptor

A

Global descriptor table

5
Q

What is size of base

A

32 bit

6
Q

What is size of limit

A

20 bit

7
Q

What is granularity

A

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

8
Q

What is size of paragraph

A

16 byte

9
Q

What is size of page

A

4 kb

10
Q

What is vesa mode of graphic adapter

A

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

11
Q

What is benefit of protected mode

A

Larger memory availability

12
Q

What are default colors of computer

A

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

13
Q

What is size of veso

A

16 bit

14
Q

What is vesa extension

A

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

4F

15
Q

What are sub services of vesa

A

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

16
Q

What is AL in vesa service

A

check for function support

17
Q

What is AH in vesa service

A
It shows status
0x00 = successful
0x01 = fail
0x02 = function not supported
0x03 = function invalid
18
Q

What is 16 bit formation

A

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

19
Q

What are 2 modes

A
  • real

- protected