Ch 17: Secondary Storage and Device Drivers

Comprehensive capstone module covering cylinder-head-sector addressing, low-level disk sector reading/writing via INT 13h, boot sector layout, and assembling character device drivers.

183 Questions183 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 31 – 40 of 183 Questions

Page 4 of 19

Q31

📝 Short Q📘 CS401📑 Lec 17🏷️ Space-Efficient Register Zeroing (XOR reg, reg)Easy🔁⭐💡📄🎓VU🏛️VU

Why is 'XOR DI, DI' preferred over 'MOV DI, 0' for clearing a 16-bit register in 8088 assembly language?

💻 assembly Snippet

xor di, di

Q32

📝 Short Q📘 CS401📑 Lec 17🏷️ Combining LODS and STOS for Video Memory Block ProcessingMedium🔁⭐💡📄🎓VU🏛️VU

Explain how the LODS and STOS instructions are combined in a processing loop to print string characters to Video RAM.

💻 assembly Snippet

lodsb
mov ah, 0x07
stosw

Q33

📝 Short Q📘 CS401📑 Lec 17🏷️ Null-Terminated Strings and Length Calculation via SCASMedium🔁⭐💡📄🎓VU🏛️VU

How do high-level languages represent string boundaries using null-terminated strings, and how does the SCAS instruction locate string termination?

💻 assembly Snippet

mov al, 0
mov cx, 0xffff
repne scasb

Q34

📝 Short Q📘 CS401📑 Lec 17🏷️ Index Pointer Post-Increment in SCAS and Null-Terminated String ProcessingMedium🔁⭐💡📄🎓VU🏛️VU

Explain why index registers (DI/SI) point past the target character when SCAS or CMPS instructions terminate, and demonstrate how to calculate the exact length of a null-terminated string using 'REPNE SCASB'.

💻 assembly Snippet

mov al, 0
mov cx, 0xffff
repne scasb

Q35

❓ MCQ📘 CS401📑 Lec 17🏷️ Far Pointer Stack Parameter Passing Rules for LES and LDSMedium🔁⭐💡📄🎓VU🏛️VU

When passing a 32-bit far pointer (Segment:Offset) on the stack to a subroutine that reads it using LES or LDS, in what sequence must the caller push the segment and offset words?

💻 assembly Snippet

push segment_val
push offset_val
call my_subroutine

A.Push Segment word first, then Offset word second
B.Push Offset word first, then Segment word second
C.Push both words simultaneously using a 32-bit PUSH instruction
D.The order does not matter because LES automatically swaps the values

Q36

❓ MCQ📘 CS401📑 Lec 17🏷️ LDS Instruction Memory Loading ConventionsEasy🔁⭐💡📄🎓VU🏛️VU

When executing the instruction 'LDS SI, [BP+4]' in 8088 assembly language, which registers are loaded from memory addresses [BP+4] and [BP+6], respectively?

💻 assembly Snippet

lds si, [bp+4]

A.SI is loaded from [BP+4], and DS is loaded from [BP+6]
B.DS is loaded from [BP+4], and SI is loaded from [BP+6]
C.SI is loaded from [BP+4], and ES is loaded from [BP+6]
D.BP is loaded from [BP+4], and SI is loaded from [BP+6]

Q37

📝 Short Q📘 CS401📑 Lec 17🏷️ LES and LDS Instructions and 32-bit Far Pointer Memory LoadingMedium🔁⭐💡📄🎓VU🏛️VU

Explain the mechanics and purpose of the LES and LDS instructions in 8088 assembly language, detailing how segment and offset registers are loaded from a 32-bit far pointer in memory.

💻 assembly Snippet

les di, [bp+4]
lds si, [far_ptr]

Q38

📝 Short Q📘 CS401📑 Lec 17🏷️ Screen Scrolling Mechanics using MOVSW and STOSWHard🔁⭐💡🌟📄🎓VU🏛️VU

Explain how screen scrolling is implemented in 8088 assembly language using the MOVSW instruction with the REP hardware prefix, and describe how the vacated bottom row is cleared.

💻 assembly Snippet

mov ax, 0xb800
mov ds, ax
mov es, ax
mov si, 160
mov di, 0
mov cx, 1920
cld
rep movsw

Q39

📝 Short Q📘 CS401📑 Lec 17🏷️ Hardware Interrupt Definition, Asynchronous, and Unpredictable CharacteristicsMedium🔁⭐💡📄🎓VU🏛️VU

Define hardware interrupts in x86 architecture, and explain why interrupts are described as both 'asynchronous' and 'unpredictable'.

Q40

📝 Short Q📘 CS401📑 Lec 17🏷️ Hardware vs Software Interrupts and Extended Far Call MechanicsMedium🔁⭐💡📄🎓VU🏛️VU

Differentiate between Hardware Interrupts and Software Interrupts in 8088 assembly language, and explain how a software interrupt acts as an extended Far CALL mechanism.

💻 assembly Snippet

int 0x21

Ch 17: Secondary Storage and Device Drivers

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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