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VU CS401- Computer Architecture and Assembly Language Programming FinalTerm solved unsolved past papers Fall 2008

VU CS401- Computer Architecture And Assembly Language Programming FinalTerm Solved Unsolved Past Papers Fall 2008

 

 

FINALTERM  EXAMINATION

 

Fall 2008

 

CS401- Computer Architecture and Assembly Language Programming (Session – 1)

 

Marks: 75

 

Question No: 1      ( Marks: 1 ) – Please choose one

 

Which of the following is not true about registers:

 

 

 

Their operation is very much like memory

 

Intermediate results may also be stored in registers.

 

 

They are also called scratch pad ram

 

 

None of given options.

 

 

 

Question No: 2      ( Marks: 1 ) – Please choose one

 

move [bp], al moves the one byte content of the AL register to the address contained in BP register in the current

 

 

Stack segment

 

 

Code segment

 

 

Data segment

 

 

Extra segment

 

 

 

Question No: 3      ( Marks: 1 ) – Please choose one

 

In a rotate through carry right (RCR) instruction applied on a 16 bit word effectively there is

 

 

 

 

 

16 bits rotation

 

 

1 bit rotation

 

 

17 bits rotation

 

 

8 bits rotation

 

 

 

Question No: 4      ( Marks: 1 ) – Please choose one

 

The 8088 stack  works on

 

 

 

Word sized elements

 

 

Byte sized elements

 

 

Double sized element

 

 

Nible sized element

 

 

 

Question No: 5      ( Marks: 1 ) – Please choose one

 

An 8 x 16 font is stored in ______________ bytes.

 

 

2

 

4

 

8

 

16

 

 

Question No: 6      ( Marks: 1 ) – Please choose one

 

 

INT 10 is used for __________ services.

 

 

 RAM

 

 Disk

 

 BIOS video

 

 DOS video

 

 

Question No: 7      ( Marks: 1 ) – Please choose one

 

Priority of IRQ 0 interrupt is

 

 

 medium

 

 high

 

 highest

 

low

 

 

Question No: 8      ( Marks: 1 ) – Please choose one

 

Threads can have function calls, parameters and __________ variables.

 

 

 global

 

 local

 

 legal

 

 illegal

 

 

Question No: 9      ( Marks: 1 ) – Please choose one

 

How many prevalent calling conventions do exist

 

 

1

 

2

 

 

 

3

 

4

 

 

Question No: 10      ( Marks: 1 ) – Please choose one

 

In 9pin DB 9 DSR is assigned on pin number

 

 

4

 

5

 

6

 

7

 

 

Question No: 11      ( Marks: 1 ) – Please choose one

 

In 9pin DB 9 CTS is assigned on pin number

 

 

6

 

7

 

8

 

9

 

 

Question No: 12      ( Marks: 1 ) – Please choose one

 

In 9pin DB 9 CD is assigned on pin number

 

 

1

 

2

 

3

 

4

 

 

Question No: 13      ( Marks: 1 ) – Please choose one

 

 

 

In 9pin DB 9 RD is assigned on pin number

 

 

1

 

2

 

3

 

4

 

 

Question No: 14      ( Marks: 1 ) – Please choose one

 

in device attribute word which of the following bit decides whether it is a charater device or a block device

 

 

Bit 12

 

Bit 13

 

Bit 14

 

Bit 15

 

 

Question No: 15      ( Marks: 1 ) – Please choose one

 

Video servioces are classified into __________ broad catagories

 

 

2

 

3

 

4

 

5

 

 

Question No: 16      ( Marks: 1 ) – Please choose one

 

In STOSB instruction, when DF is clear, SI is

 

 

 

Incremented by 1

 

 

 

 

 

 

 

 

 

Incremented by 2

 

 

Decremented by 1

 

 

Decremented by 2

 

 

 

Question No: 17      ( Marks: 1 ) – Please choose one

 

The process of sending signals back and forth is called

 

 

 

Activity

 

 

Hand-shaking

 

 

Interruption

 

 

Time clicking

 

 

 

Question No: 18      ( Marks: 1 ) – Please choose one

 

Which of the following interrupts is used for Arithmetic overflow

 

 

 

INT 1

 

INT 2

 

INT 3

 

INT 4

 

 

Question No: 19      ( Marks: 1 ) – Please choose one

 

which of the following is a special type of interrupt that returns to the same instruction instead of the next instruction

 

 

 

 

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Divide overflow interrupt

 

 

Debug interrupt

 

 

Arithmetic overflow interrupt

 

 

Change of sign interrupt

 

 

 

Question No: 20      ( Marks: 1 ) – Please choose one

 

Which of the following IRQs is derived by a timer device?

 

 

 

IRQ 0

 

IRQ 1

 

IRQ 2

 

IRQ 3

 

 

Question No: 21      ( Marks: 1 ) – Please choose one

 

Which of the following IRQs is connected to serial port COM 2?

 

 

 

IRQ 0

 

IRQ 1

 

IRQ 2

 

IRQ 3

 

 

Question No: 22      ( Marks: 1 ) – Please choose one

 

An End of Interrupt (EOI) signal is sent by

 

 

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Handler

 

Processor

 

IRQ

 

PIC

 

 

Question No: 23      ( Marks: 1 ) – Please choose one

 

The source registers in OUT is

 

 

AL or AX

 

BL or BX

 

CL or CX

 

DL or DX

 

 

Question No: 24      ( Marks: 1 ) – Please choose one

 

In programmable interrupt controller which of the following ports is used for selectively enabling or disabling interrupts

 

 

19

 

20

 

21

 

22

 

 

Question No: 25      ( Marks: 1 ) – Please choose one

 

The number of pins in a parallel port connector are?

 

 

 

20

 

 

 

 

 

 

 

 

25

 

30

 

35

 

 

Question No: 26      ( Marks: 1 ) – Please choose one

 

Which of the following pins of a parallel port connector are grounded?

 

 

10-18

 

18-25

 

25-32

 

32-39

 

 

Question No: 27      ( Marks: 1 ) – Please choose one

 

Suppose a decimal number 35 when its binary is shifted to write two places the new number will become

 

 

35

 

70

 

140

 

17

 

 

Question No: 28      ( Marks: 1 ) – Please choose one

 

A 32bit address register can access upto …………………….. of memory so memory

 

access has increased a lot.

 

 

2GB

 

4GB

 

6GB

 

8GB

 

 

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Question No: 29      ( Marks: 1 ) – Please choose one

 

In NASM an imported symbol is declared with the ………………………. while and
exported symbol is declared with the ……………………….
Global directive, External directive
External directive, Global directive
Home Directive, Foreign Directive
Foreign Directive, Home Directive
Question No: 30( Marks: 1 ) – Please choose one
Single step interrupt is
Hardware interrupt
Like divide by zero interrupt
Like divide by 1 interrupt
Software interrupt
Question No: 31( Marks: 1 )
Which services are gained bi INT 0x16

 

 

Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

Software interrupt

 

Question No: 32      ( Marks: 1 )

 

 

 

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Give the name of any one VESA servic

 

 

Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

Software interrupt

 

Question No: 33      ( Marks: 2 )

 

INT 14 – SERIAL – READ CHARACTER FROM PORT

 

By using above port  what do AH,AL and DX shows here?

 

 

Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

Software interrupt

 

Question No: 34      ( Marks: 2 )

 

What do these instructions do ? write your answer in single line. mov cx, 0xffff

 

loop $

 

 

Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

 

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Software interrupt

 

Question No: 35      ( Marks: 3 )

 

Define the protected mode

 

 

Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

Software interrupt

 

Question No: 36      ( Marks: 3 )

 

Write a program in assembly language to disable keyboard interrupt using PIC mask register

 

Hint: Only five instructions are needed

 

 

Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

Software interrupt

 

Question No: 37      ( Marks: 3 )

 

Read the following passage carefully and fill the blanks with proper words. Note: Don’t rewrite the passage just write the words in same order.

 

“BIOS sees the disks as a combination of sectors, tracks, and…………….., as a raw storage device without concern to whether it is reading a file or directory.

 

…………….. provides the simplest and most powerful interface to the storage medium. However this raw storage is meaningless to the user who needs to store his files and organize them into………………… . ”

 

 

 

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Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

Software interrupt

 

Question No: 38      ( Marks: 5 )

 

What is interrupt chaining? Describe its purpose.

 

 

Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

Software interrupt

 

Question No: 39      ( Marks: 5 )

 

Write any five DOS services for file manipulation.

 

 

Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

Software interrupt

 

Question No: 40      ( Marks: 10 )

 

 

 

 

 

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Now write down instructions for saving the values of cx, dx, si, di, bp and es in current pcb in the same order.

 

 

Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

Consider the following instruction that save ax register into current PCB mov [pcb+bx+0], ax

 

Software interrupt

 

Question No: 41      ( Marks: 10 )

 

Read the passage and fill in the blanks with words given at the bottom. Note: Don’t rewrite the passage just write the words in same order

 

“Serial port is also accessible via ……………….ports. ……………….. is accessible via
ports 3F8-3FF while ………………. isaccessible via 2F8-2FF. The first register at
3F8 (or 2F8 for the other port) is the ………………….. holding register if written to
and the receiver…………………. register if read from. Other registers of our interest
include 3F9 whose ……………… must be set to enable received data available
interrupt and ……………….. must be set to enable transmitter holding register

 

empty interrupt. Bit 0 of 3FA is set if an interrupt is pending and its bits 1-3 identify the cause of the interrupt. The three bit causes are as follows.”

 

(Transmitter, COM1,  I/O,COM2,bit 0, buffer, 3FA)

 

 

Solution:

 

 

Hardware interrupt

 

Like divide by zero interrupt

 

Like divide by 1 interrupt

 

Software interrupt

 

 

 

 

 

 

 

 

 

VU CS401- Computer Architecture And Assembly Language Programming FinalTerm Solved Unsolved Past Papers Fall 2008

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