CS401 Final term Paper 2010 - 1

CS401 Final 2010 Paper 

CS401 Question No: 1
The physical address of the stack is obtained by
SS:SI combination
SS:SP combination
ES:BP combination
ES:SP combination

CS401 Question No: 2
Value of AH in the write Graphics pixel service is
0Ch
0Bh
1Ch
2Ch

CS401 Question No: 3
Threads can have function calls, parameters and __________ variables.
global
local
legal
illegal

CS401 Question No: 4
Creation of threads can be
static
dynamic
easy
difficult

CS401 Question No: 5
How many prevalent calling conventions do exist
1
2
3
4

CS401 Question No: 6
VESA VBE 2.0 is a standard for
High resolution Mode
Low resolution Mode
Medium resolution Mode
Very High resolution Mode

CS401 Question No: 7
The serial port connection is a ------------------ connector
9pin DB 9
8pin DB 9
3pin DB 9
9pin DB 5

CS401 Question No: 8
Which of the following gives the more logical view of the storage medium
BIOS
DOS
Both
None

CS401 Question No: 9
In STOSB instruction, when DF is clear, SI is
Incremented by 1
Incremented by 2
Decremented by 1
Decremented by 2

CS401 Question No: 10
After the execution of STOSW the CX will be
Decremented by 1
Decremented by 2
Incremented by 1
Incremented by 2

CS401 Question No: 11
IRQ is referred to
Eight input signals
One output signal
One input signals
Eight output signals

CS401 Question No: 12
Which of the following IRQs is derived by a key board?
IRQ 0
IRQ 1
IRQ 2
IRQ 3

CS401 Question No: 13
Which of the following IRQs is connected to serial port COM 1?
IRQ 4
IRQ 5
IRQ 6
IRQ 7

CS401 Question No: 14
The physical address of IDT( Interrupt Descriptor Table) is stored in _______
GDTR
IDTR
IVT
IDTT

CS401 Question No: 15
Assembly language is:
Low-level programming language
High-level programming language
Also known as machine language
Not considered closer to the computer

CS401 Question No: 16
The number of bits required to access 1MB of memory are
16 bits
32 bits
Depends on the processor architecture
20 bits

CS401 Question No: 17
In STOSB instruction, SI is decremented or incremented by
3
2
1
4

CS401 Question No: 18
In programmable interrupt controller, which of the following ports is referred as a control port.
19
20
21
22

CS401 Question No: 19
INT 21 service 01H is used to read character from standard input with echo. It returns the result in ______ register.
AL
BL
CL
BH

CS401 Question No: 20
In device attribute word, which of the following bit decides whether it is a character device or a block device
Bit 12
Bit 13
Bit 14
Bit 15

CS401 Question No: 21
In 9pin DB 9, which pin number is assigned to CTS (Clear To Send) ?
6
7
8
9

CS401 Question No: 22
In 9pin DB 9, which pin number is assigned to RD (Received Data) ?
1
2
3
4
CS401 Question No: 23
VESA(Video Electronics Standards Association) organizes 16 color bits for every pixel in
5:5:5 format
5:6:5 format
6:5:6 format
5:6:7 format

CS401 Question No: 24
Motorola 68K processors have ....................... 23bit general purpose registers.
4
8
16
32
CS401 Question No: 25
Programmable Interrupt Controller (PIC) has
One input signals and eight output signals
One input signal and one output signal
Eight input signals and one output signals
Eight input signals and eight output signals

CS401 Question No: 26
Video services are classified into...................... broad categories.
5
4
3
2

CS401 Question No: 27 ( M a r k s: 2 )
What are device drivers? give your answer in two to three lines.

CS401 Question No: 28 ( M a r k s: 2 )
For what purpose "INT 1" is reserved ?

CS401 Question No: 29 ( M a r k s: 2 )
How interrupts are handled in protected mode.

CS401 Question No: 30 ( M a r k s: 2 )
Which bit of acknowledge is used to generate IRQ7

CS401 Question No: 31 ( M a r k s: 3 )
Write the name three flags which are not used for mathematical operations.

CS401 Question No: 32 ( M a r k s: 3 )
"INT 13 - DISK - GET DRIVE PARAMETERS " uses which registers to return error flag and error number.

CS401 Question No: 33 ( M a r k s: 3 )
Who is responsible for removing the parameter from the stack when we call a function in C and Pascal?

CS401 Question No: 34 ( M a r k s: 5 )

Read the passage carefully and choose proper word for each blank space from the list given below .
In descriptors the 32bit base is scattered into different places because of compatibility reasons. The limit is stored in 20 bits but the ...............defines that the limit is in terms of bytes of 4K pages therefore a maximum of 4GB size is possible. The ................. must be set to signal that this segment is present in memory. DPL is the descriptor privilege level again related to the protection levels in 386. .................. defines that this segment is to execute code is 16bit mode or 32bit mode. .................. is conforming bit that we will not be using. ..................signals that the segment is readable. A bit is automatically set whenever the segment is accessed.

(A bit, C bit, G bit, D bit, P bit , R bit, B bit)

CS401 Question No: 35 ( M a r k s: 5 )
Write assembly language instructions to set the timer interrupt frequency at 1 ms.

CS401 Question No: 36 ( M a r k s: 5 )
In the context of " INT 13 - DISK - WRITE DISK SECTOR(S)" fill the blanks by choosing the correct answer against each blank space from the list given at the bottom.
AH = ....................
AL = ...............................
CH = ..............................
CL = sector number 1-63 (bits 0-5)
high two bits of cylinder (bits 6-7, hard disk only)
DH = .....................................
DL = drive number (bit 7 set for hard disk)
ES:BX -> .......................................
(Number of sectors to write, head number , 03h, data buffer , low eight bits of cylinder number)