Ch 08: String Instructions and Primitives

Comprehensive study of x86 string primitives operating across DS:SI and ES:DI, hardware-accelerated memory copy, screen clearing via STOSW, string length calculation via SCASB, and string comparison via CMPSB.

307 Questions307 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 51 – 60 of 307 Questions

Page 6 of 31

Q51

📝 Short Q📘 CS401📑 Lec 8🏷️ 8.1. DOS Device Drivers (Device Driver Definition and Function)Easy🔁⭐💡📄🎓VU🏛️VU

What are device drivers in operating system architecture? Provide a concise 2 to 3-line technical definition.

Q52

📝 Short Q📘 CS401📑 Lec 8🏷️ 8.1. BIOS Disk Services (INT 0x13 Service 0x08 Get Drive Parameters Error Registers)Easy🔁⭐💡📄🎓VU🏛️VU

When calling BIOS service `INT 0x13 / AH = 0x08` (Get Drive Parameters), which registers are used to return the error flag and error code if the operation fails?

💻 assembly Snippet

mov ah, 0x08 ; Get Drive Parameters
mov dl, 0x80 ; First hard drive
int 0x13
jc error_handler ; If CF = 1, error code is in AH

Q53

📝 Short Q📘 CS401📑 Lec 8🏷️ 8.1. BIOS Disk Services (INT 0x13 Service 0x03 Register Parameters)Easy🔁⭐💡📄🎓VU🏛️VU

In BIOS disk interrupt service `INT 13h / AH = 03h` (Write Disk Sectors), match the parameters to their corresponding CPU registers from the given list: (Number of sectors to write, head number, 03h, data buffer, low eight bits of cylinder number) - AH = __________ - AL = __________ - CH = __________ - DH = __________ - ES:BX -> __________

💻 assembly Snippet

mov ah, 0x03 ; Service 03h (Write Sectors)
mov al, 1    ; Number of sectors to write
mov ch, 0    ; Cylinder number (low 8 bits)
mov dh, 0    ; Head number
mov dl, 0x80 ; Drive 0x80
les bx, [buf]; ES:BX -> data buffer

Q54

❓ MCQ📘 CS401📑 Lec 8🏷️ 8.1. Hardware Interrupts (IRET Interrupt Return Mechanics)Easy🔁⭐💡📄🎓VU🏛️VU

Which x86 instruction is executed at the end of an Interrupt Service Routine (ISR) to restore execution state by popping `IP`, `CS`, and the `FLAGS` register from the stack?

💻 assembly Snippet

custom_isr:
  ; ISR body
  iret ; Pops IP, CS, and FLAGS from stack

A.Ret n
B.REZA
C.REPE
D.IRET

Q55

❓ MCQ📘 CS401📑 Lec 8🏷️ 8.1. Hardware Interrupts (INT 1 Trap / Single Step Interrupt)Easy🔁⭐💡📄🎓VU🏛️VU

In x86 processor interrupt architecture, which interrupt vector is reserved for the Trap / Single Step interrupt?

A.INT 0
B.INT 1
C.INT 3
D.INT 4

Q56

❓ MCQ📘 CS401📑 Lec 8🏷️ 8.1. Hardware Interrupts (INT 2 Non-Maskable Interrupt NMI)Easy🔁⭐💡📄🎓VU🏛️VU

In x86 processor interrupt architecture, which interrupt vector is assigned to the Non-Maskable Interrupt (NMI)?

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

Q57

❓ MCQ📘 CS401📑 Lec 8🏷️ 8.1. Interrupt Handling and Hooking (Interrupt Vector Table IVT Modification)Easy🔁⭐💡📄🎓VU🏛️VU

To hook an interrupt in x86 assembly language, the programmer modifies the interrupt __________ corresponding to that interrupt in the Interrupt Vector Table (IVT).

💻 assembly Snippet

; Vector entry for INT N = IVT address (N * 4)

A.SX
B.vector
C.AX
D.BX

Q58

❓ MCQ📘 CS401📑 Lec 8🏷️ 8.1. Hardware Interrupts (IRQ 1 Keyboard Controller Interrupt)Easy🔁⭐💡📄🎓VU🏛️VU

In IBM PC architecture, which hardware interrupt request line (IRQ) is assigned to the keyboard controller?

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

Q59

❓ MCQ📘 CS401📑 Lec 8🏷️ 8.1. Hardware Interrupts (IRQ 6 Floppy Disk Controller Interrupt)Easy🔁⭐💡📄🎓VU🏛️VU

In IBM PC architecture, which hardware interrupt request line (IRQ) is assigned to the Floppy Disk Drive controller?

A.IRQ 4
B.IRQ 5
C.IRQ 6
D.IRQ 7

Q60

❓ MCQ📘 CS401📑 Lec 8🏷️ 8.1. Hardware Interrupts (INT 0 Division by Zero Exception)Easy🔁⭐💡📄🎓VU🏛️VU

When a divide-by-zero error or quotient overflow occurs during execution of `DIV` or `IDIV`, how is the 'Divide by 0' exception (`INT 0`) triggered?

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

Ch 08: String Instructions and Primitives

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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