Ch 15: 32-Bit Protected Mode Architecture

Covers transitioning from 16-bit real mode to 32-bit protected mode, setting the PE bit in CR0, constructing 8-byte segment descriptors (base, limit, access rights), and hardware memory protection rings (Ring 0 vs Ring 3).

173 Questions173 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 151 – 160 of 173 Questions

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Q151

❓ MCQ📘 CS401📑 Lec 15🏷️ Serial Port Line Status Register (LSR) BitsEasy🔁⭐💡📄🎓VU🏛️VU

Every bit in the serial port Line Status Register (LSR) conveys ________ information regarding serial hardware status.

A.Different
B.Same
C.Partial
D.Full

Q152

❓ MCQ📘 CS401📑 Lec 15🏷️ Standard Floppy Disk Capacity (1440 KB)Easy🔁⭐💡📄🎓VU🏛️VU

A standard 3.5-inch High Density (HD) floppy disk has a total formatted storage capacity of:

A.1444 KB
B.1440 KB
C.1280 KB
D.2480 KB

Q153

❓ MCQ📘 CS401📑 Lec 15🏷️ Serial Port COM1 Base Port Registers (0x3F8)Medium🔁⭐💡📄🎓VU🏛️VU

In serial port communication, I/O port address 0x3F8 (COM1 base address) serves as the ________ holding register when written to, and the receiver ________ register when read from.

💻 assembly Snippet

mov dx, 0x3f8
in al, dx     ; Read from Receiver Buffer Register
out dx, al    ; Write to Transmitter Holding Register

A.Transmitter, Buffer
B.Buffer, Transmitter
C.Receiver, Transmitter
D.Control, Status

Q154

❓ MCQ📘 CS401📑 Lec 15🏷️ DOS Program Segment Prefix (PSP Offset 0x82 Command Tail)Medium🔁⭐💡📄🎓VU🏛️VU

In a DOS.COM program, at what memory offset within the Program Segment Prefix (PSP) does the command-line parameter string (command tail) begin?

A.0x80
B.0x82
C.0x84
D.0x86

Q155

❓ MCQ📘 CS401📑 Lec 15🏷️ DOS INT 21h Service 3Dh Error Reporting (CF=1)Easy🔁⭐💡📄🎓VU🏛️VU

On executing DOS INT 21h Service 3Dh (Open File), if the target file cannot be opened, how is the failure reported?

💻 assembly Snippet

mov ah, 0x3d
mov al, 0
mov dx, filename
int 0x21
jc open_error   ; Branch if Carry Flag (CF) = 1

A.CF will contain 1
B.CF will contain 0
C.ZF will contain 1
D.ZF will contain 0

Q156

❓ MCQ📘 CS401📑 Lec 15🏷️ DOS PSP Offset 0x82 Command TailMedium🔁⭐💡📄🎓VU🏛️VU

In a DOS.COM file, at what memory offset within the Program Segment Prefix (PSP) does the command-line parameter argument string begin?

A.0x80
B.0x82
C.0x84
D.0x86

Q157

❓ MCQ📘 CS401📑 Lec 15🏷️ BIOS INT 13h Service 0x03 (Write Disk Sector)Medium🔁⭐💡📄🎓VU🏛️VU

In BIOS INT 13h disk services, what is the function of Service 03h (AH = 0x03)?

💻 assembly Snippet

mov ah, 0x03
mov al, 1     ; Number of sectors to write
int 0x13

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

Q158

❓ MCQ📘 CS401📑 Lec 15🏷️ RS-232 DB-9 Serial Port Pinout (TD Pin 3)Easy🔁⭐💡📄🎓VU🏛️VU

On a standard 9-pin DB-9 RS-232 serial port connector, which pin is assigned to TD (Transmitted Data)?

A.Pin 1
B.Pin 2
C.Pin 3
D.Pin 4

Q159

❓ MCQ📘 CS401📑 Lec 15🏷️ RS-232 DB-9 Serial Port Pinout (RD Pin 2)Easy🔁⭐💡📄🎓VU🏛️VU

On a standard 9-pin DB-9 RS-232 serial connector, which pin is assigned to RD (Received Data)?

A.Pin 1
B.Pin 2
C.Pin 3
D.Pin 4

Q160

❓ MCQ📘 CS401📑 Lec 15🏷️ RS-232 DB-9 Serial Port Pinout (DSR Pin 6)Easy🔁⭐💡📄🎓VU🏛️VU

On a standard 9-pin DB-9 RS-232 serial connector, which pin is assigned to DSR (Data Set Ready)?

A.Pin 6
B.Pin 5
C.Pin 3
D.Pin 4

Ch 15: 32-Bit Protected Mode Architecture

CS401 - Computer Architecture and Assembly Language Programming Examination Practice

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CS401 - Computer Architecture and Assembly Language Programming Examination Practice

Mid Term Examination

Final Term Examination

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