← CS401 - Computer Architecture and Assembly Language Programming OverviewChapter 7

Ch 07: Video Memory & Screen Display

264 Questions264 MCQs0 Short Questions0 Long Questions
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Showing 101 – 110 of 264 Questions
Page 11 of 27
Q101
❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (Screen Memory Byte Offset 160 Coordinates)Easy🔁⭐💡📄🎓VU🏛️VU
Executing the instruction `mov word [es:160], 0x1230` in standard 80x25 text-mode video memory renders a character at which exact screen coordinate position?
💻 assembly Snippet
; Offset = (Row * 80 + Column) * 2
; For Row 2 (index 1), Column 1 (index 0): Offset = (1 * 80 + 0) * 2 = 160
  1. A.First column of second row
  2. B.Second column of first row
  3. C.Second column of second row
  4. D.First column of third row
Q102
❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. String Instructions (REP Repeat Prefix)Easy🔁⭐💡📄🎓VU🏛️VU
Which special instruction prefix is used to automatically repeat string operations (like `MOVSB` or `STOSB`) for a block of memory based on the count in `CX`?
💻 assembly Snippet
mov cx, 100
rep movsb ; Repeats movsb 100 times
  1. A.rep
  2. B.repeat
  3. C.repb
  4. D.repe
Q103
❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (ASCII Code 0x30 Character Mapping)Easy🔁⭐💡📄🎓VU🏛️VU
In the assembly instruction `mov word [es:160], 0x1230`, what character is represented by the lower byte `0x30` when written to video memory?
💻 assembly Snippet
mov word [es:160], 0x1230 ; Low byte 0x30 = ASCII '0'
  1. A.A
  2. B.B
  3. C.0
  4. D.1
Q104
❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. String Instructions (Index Register Pair SI and DI)Easy🔁⭐💡📄🎓VU🏛️VU
Which pair of registers is specifically used as source and destination index pointers to access memory in string primitive instructions?
💻 assembly Snippet
movsb ; Source [DS:SI], Destination [ES:DI]
  1. A.DI and BP
  2. B.SI and BP
  3. C.DI and SI
  4. D.DS and SI
Q105
❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. String Instructions (STOSW and CX Iteration Decrement)Easy🔁⭐💡📄🎓VU🏛️VU
After the execution of string instruction `STOSW` (Store String Word) with the Direction Flag clear (`DF = 0`), the iteration count in register `CX` will be __________.
💻 assembly Snippet
rep stosw ; Decrements CX by 1 per word stored
  1. A.Incremented by 1
  2. B.Incremented by 2
  3. C.Decremented by 1
  4. D.Decremented by 2
Q106
❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (Screen Memory Byte Offset 160 Coordinates)Easy🔁⭐💡📄🎓VU🏛️VU
Executing `mov word [ES:160], 0x1230` in standard 80x25 text mode renders a character on screen at which position?
  1. A.First column of second row
  2. B.Second column of first row
  3. C.Second column of second row
  4. D.First column of third row
Q107
❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (BIOS INT 10h Service 0Ch Write Pixel)Easy🔁⭐💡📄🎓VU🏛️VU
In BIOS video service interrupt `INT 10h`, what is the value required in register `AH` to invoke the Write Graphics Pixel service?
💻 assembly Snippet
mov ah, 0x0C ; Write graphics pixel service
mov al, 0x0F ; Pixel color (White)
mov cx, 100  ; X coordinate
mov dx, 50   ; Y coordinate
int 0x10
  1. A.0Ch
  2. B.0Bh
  3. C.1Ch
  4. D.2Ch
Q108
❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (VESA VBE High Resolution Standards)Easy🔁⭐💡📄🎓VU🏛️VU
VESA VBE (Video Electronics Standards Association BIOS Extension) 2.0 is an industry interface standard established for __________.
  1. A.High resolution Mode
  2. B.Low resolution Mode
  3. C.Medium resolution Mode
  4. D.Very High resolution Mode
Q109
❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. String Instructions (STOSB Direction Flag Increment)Easy🔁⭐💡📄🎓VU🏛️VU
In the `STOSB` (Store String Byte) instruction, when the Direction Flag is clear (`DF = 0`), the destination index pointer register (`DI`) is __________.
💻 assembly Snippet
cld
stosb ; Stores AL at [ES:DI] and increments DI by 1
  1. A.Incremented by 1
  2. B.Incremented by 2
  3. C.Decremented by 1
  4. D.Decremented by 2
Q110
❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. String Instructions (STOSW and CX Iteration Decrement)Easy🔁⭐💡📄🎓VU🏛️VU
When executing `STOSW` (Store String Word) with repeat prefix (`REP STOSW`), after each word store iteration, register `CX` will be __________.
💻 assembly Snippet
rep stosw ; Decrements CX by 1 per word iteration
  1. A.Decremented by 1
  2. B.Decremented by 2
  3. C.Incremented by 1
  4. D.Incremented by 2

📖 Related CS401 - Computer Architecture and Assembly Language Programming Curriculum Units

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View All CS401 - Computer Architecture and Assembly Language Programming Chapters →
Ch 01: Introduction to Assembly Language387 QsCh 02: 16-Bit Segmented Memory Model & Addressing Modes395 QsCh 03: Branching, Loops and Program Flow261 QsCh 04: Bit Manipulation and Shifts198 QsCh 05: Subroutines and Stack Architecture222 QsCh 06: Parameter Passing and Stack Frames216 Qs