Chapter 16

Question 1

What is ASCII stands for

Answer 1

American Standard Code for Information Interchange.

Question 2

What is ASCII code

Answer 2

standard numeric representation

Question 3

What is the difference between VGA memory and computer memory

Answer 3

Same

Question 4

What is the memory location of IBM PC text mode

Answer 4

B80000

Question 5

What is video attribute

Answer 5

The second byte in the word designated for one screen location holds the foreground and background colors for the character. This is called its video attribute.

Question 6

What is the role of bit 7 in word

Answer 6

Blinking of foreground character

Question 7

What register commonly used for videos access

Answer 7

ES

Question 8

Can we load a segment register with intermediate operand

Answer 8

No

Question 9

mov word [es:0], 0x0741

does what

Answer 9

print an ‘A’ on the top left of the screen in white color on black background.

Question 10

mov word [es:160], 0x1230

does what

Answer 10

This is displayed 80 words after the start and there are 80 characters in one screen row. Therefore this is displayed on the first column of the second line. the attribute byte is 12 meaning green color on blue background.