CS401P Quiz 9

CS401P - Quiz No.9

Date: 07 January 2026

Q1. What does the attribute byte in the word designated for one screen location hold?

1. Foreground and background colors
2. Video controller instructions
3. ASCII code for the character
4. Cursor height information

Correct answer: Foreground and background colors

Q2. What is the significance of the memory location B8000 in the context of Display Memory?

1. BIOS vendor's problem location
2. Default cursor position
3. Physical memory location for video controller's memory
4. Segment register for accessing video memory

Correct answer: Physical memory location for video controller's memory

Q3. How is the screen location calculated (in the context of display memory formation)?

1. Multiplying row number by 80 and adding column number
2. Adding row and column numbers
3. Dividing row and column numbers
4. Using the MUL instruction

Correct answer: Multiplying row number by 80 and adding column number

Q4. Which of following interrupt is used for BIOS Video Services

1. 0x16
2. 0x13
3. 0x21
4. 0x10

Correct answer: 0x10

Q5. Service numbers are given in ________ register while sub services in ________

1. AH, AL or BL
2. AX, Al or Ah
3. Al, Ah or ax
4. Ax, Bx

Correct answer: AH, AL or BL

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