Ch 12: Terminate and Stay Resident (TSR)

In-depth study of writing Terminate and Stay Resident (TSR) programs in assembly, preserving resident memory blocks, intercepting keyboard scancodes via INT 09h, and unhooking interrupt vectors cleanly.

127 Questions127 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 127 Questions

Page 2 of 13

Q11

❓ MCQ📘 CS401📑 Lec 12🏷️ 12.1. DOS Program Segment Prefix (COM File Entry Point Offset 0x0100)Easy🔁⭐💡📄🎓VU🏛️VU

In a DOS executable program formatted as a `.COM` file, the entry point and first program instruction must be located at which segment offset?

💻 assembly Snippet

[org 0x0100] ; Entry point for DOS COM files

A.0x0010
B.0x0100
C.0x1000
D.0x0000

Q12

❓ MCQ📘 CS401📑 Lec 12🏷️ 12.1. Multitasking and Threads (Dynamic Thread Creation)Easy🔁⭐💡📄🎓VU🏛️VU

In operating systems and thread management, the creation of threads can be __________.

A.static
B.dynamic
C.easy
D.difficult

Q13

❓ MCQ📘 CS401📑 Lec 12🏷️ 12.1. Multitasking and Threads (Scheduler Task Scheduling)Easy🔁⭐💡📄🎓VU🏛️VU

The thread registration code initializes the Process Control Block (PCB) and adds it to the active task linked list so that the __________ will allocate CPU execution time to it.

A.assembler
B.scheduler
C.linker
D.debugger

Q14

📝 Short Q📘 CS401📑 Lec 12🏷️ 12.1. Multitasking and Threads (Timer Interrupt Frequency and Context Switching)Medium⭐💡📄🎓VU🏛️VU

How can the scheduling frequency and execution speed of preemptive multitasking be increased in an assembly language environment?

💻 assembly Snippet

; Reprogramming PIT Channel 0 for higher frequency
mov al, 0x36   ; Channel 0, LSB/MSB, square wave mode
out 0x43, al
mov ax, 11931  ; Higher frequency divisor (100 Hz timer)
out 0x40, al   ; Send LSB
mov al, ah
out 0x40, al   ; Send MSB

Q15

📝 Short Q📘 CS401📑 Lec 12🏷️ 12.1. Multitasking and Threads (PCB Memory Allocation Directive)Medium⭐💡📄🎓VU🏛️VU

Write the assembly language instruction/directive required to allocate memory space for 32 Process Control Blocks (PCBs) in a multitasking kernel where each PCB consists of 16 word registers.

💻 assembly Snippet

pcb: times 32*16 dw 0 ; Allocates memory space for 32 PCBs

Q16

❓ MCQ📘 CS401📑 Lec 12🏷️ DOS Keyboard Input Services (INT 21h Service 0Ah)Medium🔁⭐💡📄🎓VU🏛️VU

When using DOS buffered keyboard input (INT 21h, Service 0Ah), which byte in the parameter buffer stores the actual number of characters entered by the user?

💻 assembly Snippet

buffer: db 80, 0
        times 80 db 0

A.First byte
B.Second byte
C.Third byte
D.Fourth byte

Q17

❓ MCQ📘 CS401📑 Lec 12🏷️ DOS Device Driver ArchitectureMedium⭐💡📄🎓VU🏛️VU

In a DOS Device Driver header, which bit in the Device Attribute Word determines whether the device is a character device or a block device?

💻 assembly Snippet

dw 0x8000    ; Device Attribute Word with Bit 15 set (Character Device)

A.Bit 12
B.Bit 13
C.Bit 14
D.Bit 15

Q18

❓ MCQ📘 CS401📑 Lec 12🏷️ DOS Buffered Input Services (INT 21h Service 0Ah)Medium🔁⭐💡📄🎓VU🏛️VU

In DOS buffered keyboard input (INT 21h, Service 0Ah), which byte in the parameter buffer stores the actual number of characters read upon return?

💻 assembly Snippet

buffer: db 80, 0
        times 80 db 0

A.First byte
B.Second byte
C.Third byte
D.Fourth byte

Q19

❓ MCQ📘 CS401📑 Lec 12🏷️ DOS Services and Keyboard Input HandlingEasy🔁⭐💡📄🎓VU🏛️VU

DOS INT 21h Service 01h reads a single character from standard input with echo. In which register is the ASCII character code returned?

💻 assembly Snippet

mov ah, 0x01
int 0x21

A.AL
B.BL
C.CL
D.BH

Q20

📝 Short Q📘 CS401📑 Lec 12🏷️ Device Driver Architecture: Character vs Block DevicesEasy🔁⭐💡📄🎓VU🏛️VU

Classify and explain the two main categories of peripheral devices used in computer systems.

Ch 12: Terminate and Stay Resident (TSR)

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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