Ch 13: Multitasking & Cooperative Kernels

Covers thread and process abstractions at the assembly level, initializing independent task stacks, switching execution contexts via register swapping, and cooperative scheduling algorithms.

141 Questions141 MCQs0 Short Questions0 Long Questions

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CS401 - Computer Architecture and Assembly Language Programming Examination Practice

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

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Q31

🧠 Long Problem📘 CS401📑 Lec 13🏷️ BIOS Disk Services (INT 13h)Hard🔁⭐💡🌟📄🎓VU🏛️VU

Explain the architecture, vectoring mechanism, and primary services provided by the BIOS INT 13h disk interface.

💻 assembly Snippet

mov ah, 0x02
mov al, 1
mov ch, 0
mov cl, 2
mov dh, 1
mov dl, 0
mov bx, sector
int 0x13

Q32

📝 Short Q📘 CS401📑 Lec 13🏷️ DOS File System and Directory StructureEasy🔁⭐📄🎓VU🏛️VU

How many bytes are allocated for a root directory entry in a FAT12 floppy disk structure?

Q33

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

Which register is used by BIOS INT 13h services to return the status or error code after a disk operation?

💻 assembly Snippet

mov ah, 0x02    ; Service 2: Read Sectors
mov al, 1       ; Sector count
int 0x13        ; Invoke BIOS Disk Service
jc  disk_error  ; Jump if Carry Flag is set
; AH contains error code if CF = 1

A.Carry Flag (CF)
B.DL Register
C.AH Register
D.AL Register

Q34

❓ MCQ📘 CS401📑 Lec 13🏷️ DOS File System and Directory StructureEasy⭐💡📄🎓VU🏛️VU

In what logical unit or structure does the operating system organize data on persistent storage media?

A.Folder
B.Batch file
C.File
D.None of the above

Q35

❓ MCQ📘 CS401📑 Lec 13🏷️ BIOS Disk Sector Access ServicesMedium🔁⭐💡🌟📄🎓VU🏛️VU

What is the function of BIOS DISK service INT 13h when register AH is set to 0x03?

💻 assembly Snippet

mov ah, 0x03    ; Service 3: Write Disk Sectors
mov al, 1       ; Number of sectors
mov ch, 0       ; Cylinder 0
mov cl, 2       ; Sector 2
mov dh, 1       ; Head 1
mov dl, 0       ; Drive A:
mov bx, buffer  ; ES:BX -> data source
int 0x13        ; Invoke BIOS service

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

Q36

📝 Short Q📘 CS401📑 Lec 13🏷️ BIOS INT 13h LBA ExtensionsHard🔁⭐💡🌟📄🎓VU🏛️VU

Explain the architecture, structure, and operation of BIOS INT 13h Extended Read Services (Service 0x42).

💻 assembly Snippet

mov ah, 0x42
mov dl, 0x80
mov si, dap
int 0x13

Q37

❓ MCQ📘 CS401📑 Lec 13🏷️ DOS vs BIOS File System AbstractionsMedium⭐💡📄🎓VU🏛️VU

Which software interface layer provides a higher-level, logical view of persistent storage media by organizing raw disk sectors into files and directories?

A.BIOS
B.DOS
C.Both BIOS and DOS
D.None of the above

Q38

❓ MCQ📘 CS401📑 Lec 13🏷️ BIOS vs DOS Storage ViewsMedium🔁⭐💡📄🎓VU🏛️VU

While operating systems like DOS organize storage media into logical file systems and directory structures, BIOS software sees disk drives as ________.

A.Logical storage
B.Physical storage (raw sectors)
C.File structures
D.Virtual storage

Q39

❓ MCQ📘 CS401📑 Lec 13🏷️ BIOS vs DOS Disk Storage AbstractionsMedium🔁⭐💡📄🎓VU🏛️VU

While operating systems like DOS view disks as logical file systems, how does the system BIOS view storage drives?

A.Logical storage
B.Raw storage (physical sectors)
C.In the form of sectors only
D.In the form of tracks only

Q40

📝 Short Q📘 CS401📑 Lec 13🏷️ DOS File Management Services (INT 21h Service 3Ch)Medium🔁⭐💡🌟📄🎓VU🏛️VU

Explain how to create or truncate a file in assembly language using DOS INT 21h Service 3Ch, including parameter inputs and return flags.

💻 assembly Snippet

mov ah, 0x3C
mov cx, 0
mov dx, filename
int 0x21

Ch 13: Multitasking & Cooperative Kernels

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

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CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

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