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 141 – 150 of 307 Questions

Page 15 of 31

Q141

❓ MCQ📘 CS401📑 Lec 8🏷️ DOS INT 21h File Services Error SignalsMedium🔁⭐💡📄🎓VU🏛️VU

When invoking DOS INT 21h Service 3Dh (Open Existing File), how does the operating system signal that the file open operation failed?

💻 assembly Snippet

mov ah, 0x3D
int 0x21
jc handle_error

A.Carry Flag (CF) is set to 1 and an error code is returned in AX
B.Zero Flag (ZF) is set to 1
C.Carry Flag (CF) is cleared to 0
D.Overflow Flag (OF) is set to 1

Q142

❓ MCQ📘 CS401📑 Lec 8🏷️ 8259 PIC Cascading Architecture and IRQ 2Medium🔁⭐💡📄🎓VU🏛️VU

Which hardware Interrupt Request (IRQ) line on the primary 8259 PIC is designated as the cascading interrupt line connected to the secondary (slave) PIC?

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

Q143

❓ MCQ📘 CS401📑 Lec 8🏷️ 8259 PIC IMR Port Address (Port 21h)Medium🔁⭐💡📄🎓VU🏛️VU

The 8259 Programmable Interrupt Controller (PIC) utilizes two primary I/O ports: Port 20h serves as the Command/Control port, while Port 21h serves as __________.

💻 assembly Snippet

in al, 0x21

A.The Interrupt Mask Register (IMR)
B.Interrupt port
C.Output port
D.Input port

Q144

❓ MCQ📘 CS401📑 Lec 8🏷️ Interrupt Classification (Hardware vs Software)Easy🔁⭐💡📄🎓VU🏛️VU

The 8088 processor architecture broadly classifies interrupts into how many primary classes?

A.2 classes (Hardware and Software)
B.3 classes
C.4 classes
D.5 classes

Q145

❓ MCQ📘 CS401📑 Lec 8🏷️ BIOS INT 13h Disk Services (Write Sectors)Medium🔁⭐💡📄🎓VU🏛️VU

What operation is performed by BIOS INT 13h Service 03h?

💻 assembly Snippet

mov ah, 0x03
int 0x13

A.Read disk sectors
B.Write disk sectors
C.Reset disk subsystem
D.Get drive parameters

Q146

📝 Short Q📘 CS401📑 Lec 8🏷️ Arithmetic Overflow Exception (INT 4)Medium🔁⭐💡📄🎓VU🏛️VU

For what specific purpose is processor Interrupt 4 (INT 4) reserved in Intel x86 architecture?

💻 assembly Snippet

into

Q147

📝 Short Q📘 CS401📑 Lec 8🏷️ Single-Step Trap Interrupt (INT 1)Medium🔁⭐💡📄🎓VU🏛️VU

For what specific purpose is Interrupt 1 (INT 1) reserved in x86 architecture?

Q148

📝 Short Q📘 CS401📑 Lec 8🏷️ BIOS Keyboard Services (INT 16h)Easy🔁⭐💡📄🎓VU🏛️VU

Which hardware and system services are provided by ROM BIOS Interrupt 16h (INT 0x16)?

💻 assembly Snippet

mov ah, 0x00
int 0x16

Q149

📝 Short Q📘 CS401📑 Lec 8🏷️ Disabling Hardware Interrupts via 8259 PIC Mask RegisterMedium🔁⭐💡📄🎓VU🏛️VU

Write a 5-instruction 8088 assembly program to disable the hardware keyboard interrupt (IRQ 1) by modifying the 8259 PIC Interrupt Mask Register (IMR).

💻 assembly Snippet

in al, 0x21
or al, 2
out 0x21, al

Q150

📝 Short Q📘 CS401📑 Lec 8🏷️ BIOS Cylinder-Head-Sector (CHS) Geometry and File SystemsEasy🔁⭐💡📄🎓VU🏛️VU

Fill in the missing terms in the following text regarding disk storage abstraction: 'BIOS sees the disks as a combination of sectors, tracks, and [Blank 1], as a raw storage device without concern to whether it is reading a file or directory. BIOS provides the simplest and most powerful interface to the storage medium. However, this raw storage is meaningless to the user who needs to store files and organize them into [Blank 2].'

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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