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 11 – 20 of 264 Questions

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Q11

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Hardware Interrupts and NMI (INT 2)Easy🔁⭐💡📄🎓VU🏛️VU

Which of the following hardware interrupts is the Non-Maskable Interrupt (NMI) in x86 architecture?

💻 assembly Snippet

INT 2

A.INT 2
B.INT 0
C.INT 1
D.INT 3

Q12

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Single-Step Interrupt (INT 1) and DebuggingEasy🔁⭐💡📄🎓VU🏛️VU

In x86 processor architecture, the Single-Step Interrupt (INT 1) is classified as a(n) ________.

💻 assembly Snippet

PUSHF
POP AX
OR AX, 0x0100
PUSH AX
POPF

A.Internal / Debug interrupt (Software / CPU Exception)
B.Hardware interrupt
C.External I/O interrupt
D.Non-maskable hardware interrupt (NMI)

Q13

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Internal Hardware Exceptions and Divide-by-Zero (INT 0)Easy🔁⭐💡📄🎓VU🏛️VU

When a number is divided by zero or an arithmetic quotient overflow occurs, a Division-by-Zero interrupt is triggered. How is this interrupt invoked?

💻 assembly Snippet

MOV AX, 10
MOV BL, 0
DIV BL

A.This interrupt is generated automatically
B.INT 0
C.INT 1
D.INT 2

Q14

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Hardware/CPU Exceptions and Interrupt ClassificationEasy🔁⭐💡📄🎓VU🏛️VU

Which of the following exceptions/interrupts is a fault that returns control back to the same instruction that caused the exception, rather than the subsequent instruction?

💻 assembly Snippet

MOV AX, 1
MOV BL, 0
DIV BL

A.Divide overflow interrupt
B.Debug interrupt
C.Arithmetic overflow interrupt
D.Change of sign interrupt

Q15

❓ MCQ📘 CS401📑 Lec 7🏷️ 7.1. Hardware/CPU Interrupts and INTO (INT 4)Easy🔁⭐💡📄🎓VU🏛️VU

Which hardware/CPU interrupt vector is dedicated to handling Arithmetic Overflow exceptions (invoked conditionally via the INTO instruction)?

💻 assembly Snippet

INTO

A.INT 4
B.INT 1
C.INT 2
D.INT 3

Q16

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

Which sequence of instructions correctly initializes Extra Segment (ES) to point to text mode video display memory buffer?

💻 assembly Snippet

mov ax, 0xb800
mov es, ax ; ES now points to video RAM base 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

Q17

📝 Short Q📘 CS401📑 Lec 7🏷️ 7.4. SCAS Example - String LengthMedium⭐💡📄🎓VU🏛️VU

Which x86 string primitive instruction and repeat prefix combination is used to locate a null character (zero byte) in a string?

💻 assembly Snippet

mov di, string_ptr
mov cx, 0xffff
xor al, al
repne scasb ; Finds zero byte in string

Q18

📝 Short Q📘 CS401📑 Lec 7🏷️ 7.5. LES and LDS ExampleMedium⭐💡📄🎓VU🏛️VU

Explain the purpose, parameters, and applications of the `LES` and `LDS` instructions in x86 assembly language.

💻 assembly Snippet

les di, [far_ptr] ; Loads offset into DI and segment into ES

Q19

📝 Short Q📘 CS401📑 Lec 7🏷️ 7.1. String Primitive Instructions (MOVS and CMPS)Medium⭐💡🌟📄🎓VU🏛️VU

Describe the function, implicit register operands, auto-indexing behavior, and typical applications of the `MOVS` (Move String) and `CMPS` (Compare String) primitive instructions in x86 assembly language.

💻 assembly Snippet

rep movsb   ; Copies CX bytes from [DS:SI] to [ES:DI]
repe cmpsb  ; Compares string bytes at [DS:SI] and [ES:DI] while equal

Q20

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

In standard 80x25 text mode video memory, what data storage unit corresponds to a single character location on screen?

A.Byte
B.Word
C.Double byte
D.Double word

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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