Ch 07: Video Memory & Screen Display

Covers direct text manipulation on 80x25 character screens, calculating screen offsets ((Row * 80 + Col) * 2), attribute byte structure (foreground, background, blink bit), and converting binary values to ASCII strings.

264 Questions264 MCQs0 Short Questions0 Long Questions

🎯 Exam Practice Papers

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Timed practice exam simulation for CS401 - Computer Architecture and Assembly Language Programming.

Showing 71 – 80 of 264 Questions

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Q71

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. String Instructions (Direct Memory to Memory Transfers)Easy🔁⭐💡📄🎓VU🏛️VU

In 16-bit x86 assembly language, which specialized category of instructions allows direct memory-to-memory data transfers in a single instruction?

💻 assembly Snippet

movsb ; Copies byte directly from memory [DS:SI] to memory [ES:DI]

A.string
B.word
C.indirect
D.stack

Q72

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. String Instructions (MOVS SI and DI Register Updates)Easy🔁⭐💡📄🎓VU🏛️VU

After the execution of the `MOVS` (Move String) primitive instruction, which index registers are automatically updated?

💻 assembly Snippet

movsb ; Reads [DS:SI], writes [ES:DI], and updates both SI and DI

A.SI only
B.DI only
C.SI and DI only
D.SI, DI and BP only

Q73

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (Video Memory Attribute Byte Layout)Easy🔁⭐💡📄🎓VU🏛️VU

In standard text mode video memory, each 16-bit word cell represents one character location on screen. What information is stored in the higher memory byte address?

💻 assembly Snippet

mov word [es:0], 0x0741 ; Lower byte 0x41 ('A'), Higher byte 0x07 (Attribute byte)

A.The character code
B.The attribute byte
C.The parameters
D.The dimensions

Q74

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (Video Cell Byte Size)Easy🔁⭐💡📄🎓VU🏛️VU

In standard text-mode video RAM, how many memory bytes correspond to each individual character location on screen?

A.One byte
B.Two bytes
C.Four bytes
D.Eight bytes

Q75

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (Video Memory Base Segment 0xB800)Easy🔁⭐💡📄🎓VU🏛️VU

Which set of assembly instructions correctly initializes the Extra Segment (`ES`) register to point to the base physical address of color text-mode video memory (`0xB8000`)?

💻 assembly Snippet

mov ax, 0xb800 ; Video memory base segment
mov es, ax     ; Set ES to video segment

A.mov AX, 0xb008 mov ES, AX
B.mov AX, 0xb800 mov ES, AX
C.mov AX, 0x8b00 mov ES, AX
D.mov AX, 0x800b mov ES, AX

Q76

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (Attribute Byte Background Color Decoding)Easy🔁⭐💡📄🎓VU🏛️VU

Executing the instruction `mov word [ES:0], 0x0741` displays the character 'A' on screen. What will be the background color of the screen cell?

💻 assembly Snippet

mov word [es:0], 0x0741 ; Attribute 0x07: Background = 0 (Black), Foreground = 7 (Light Gray)

A.Black
B.White
C.Red
D.Blue

Q77

📝 Short Q📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (VESA VBE Service Functions)Easy🔁⭐💡📄🎓VU🏛️VU

Give the name and service function code of any one standard VESA VBE (Video Electronics Standards Association BIOS Extension) service.

💻 assembly Snippet

mov ax, 0x4F00 ; Return VBE Controller Information
mov di, buffer
int 0x10

Q78

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (VGA Font Memory Matrix Storage 8x16)Easy🔁⭐💡📄🎓VU🏛️VU

In standard VGA text-mode video memory, an $8 \times 16$ pixel monochrome character font matrix is stored using how many bytes of RAM?

A.8
B.16
C.4
D.20

Q79

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (Standard 7-Bit ASCII Range 0 to 127)Easy🔁⭐💡📄🎓VU🏛️VU

Standard ASCII (American Standard Code for Information Interchange) defines 128 standard characters assigned to numeric codes in the range of __________.

A.1 to 129
B.0 to 127
C.0 to 128
D.None of the Given

Q80

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Video Display Architecture (ASCII Character Code 0x41 rendering 'A')Easy🔁⭐💡📄🎓VU🏛️VU

When the ASCII character code __________ (or byte `0x41`) is written to video RAM in text mode, the video card hardware lookup font matrix renders a visual representation of character 'A' on screen.

💻 assembly Snippet

mov byte [es:0], 0x41 ; Writes ASCII 'A' (0x41) to video RAM

A.0x41 (65)
B.0x61 (97)
C.0x30 (48)
D.0x20 (32)

Ch 07: Video Memory & Screen Display

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

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