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Dec 2015 IGNOU Question Paper

This document contains a 4 page exam for the MCS-012 Computer Organization and Assembly Language Programming course. The exam contains 10 questions worth a total of 100 marks, with question 1 being compulsory and worth 40 marks. Question 1 contains subparts asking students to represent decimal numbers in IEEE floating point format, perform operations using that format, simplify a logic expression using Karnaugh mapping, write an assembly language program to find the maximum value in an array, and describe memory address mapping to cache. The remaining questions cover topics like instruction execution flow, memory addressing schemes, error detection, storage comparisons, assembly language instructions, multiplexers, interrupt handling, and displaying values in assembly language.

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192 views4 pages

Dec 2015 IGNOU Question Paper

This document contains a 4 page exam for the MCS-012 Computer Organization and Assembly Language Programming course. The exam contains 10 questions worth a total of 100 marks, with question 1 being compulsory and worth 40 marks. Question 1 contains subparts asking students to represent decimal numbers in IEEE floating point format, perform operations using that format, simplify a logic expression using Karnaugh mapping, write an assembly language program to find the maximum value in an array, and describe memory address mapping to cache. The remaining questions cover topics like instruction execution flow, memory addressing schemes, error detection, storage comparisons, assembly language instructions, multiplexers, interrupt handling, and displaying values in assembly language.

Uploaded by

pvntgns
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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No.

of Printed Pages : 4

MCS-012

MCA (Revised) / BCA (Revised)


Term-End Examination
December, 2015
MCS-012 : COMPUTER ORGANISATION AND
ASSEMBLY LANGUAGE PROGRAMMING
Time : 3 hours

Maximum Marks : 100


(Weightage 75%)

Note : Question number 1 is compulsory and carries


40 marks. Attempt any three questions from the
rest.
1. (a) IEEE floating point representation for
single precision number uses the format
as :
Sign bit (1 bit) Biased exponent (8 bits)
Significant (23 bits)
In this representation a floating point
number where 0 < E < 255 having
any significant bits is equivalent to
(1 . N) 2 (E -127) Using this format
represent the following decimal numbers :
(i)

0.375

(ii)

Now using the representation perform the


following operations :

MCS-012

(i)

0.250 x 7

(ii)

0.375 + 7
1

10

P.T.O.

(b)

Simplify the following using Karnaugh's


map
F (A, B, C, D) = E (0, 1, 3, 5, 8, 10, 13)

(c)

Write an assembly language program to


find the maximum in a group of
10 numbers stored in memory. Store the
result in AL register.

(d)

What is RAID ? List three features of RAID


level 3.

(e)

How is a main memory address mapped to


a cache address ? Assume the main
memory size of 1 K words.
1 cache block size = 32 bits
No. of cache slots = 16
Cache mapping = 2 way set associative

(0 Explain the use of PC, IR, AC, MBR


registers of a computer 'system.
(g) Consider Registers R 1 and R2 containing
Ri = 10100000

R2 = 01101100
Perform the following microoperations
using these registers :
(i)

R1 E- Ri + R2

(ii)

Shift Left R 1

(iii) R1 < R1 XOR R2

(iv) R1 E- R1 - 1
MCS-012

2. (a) Explain using a flowchart the steps of an


instruction execution.
(b)

(c)

(d)

How many RAM chips of size 256 k x 1 bit


are required to build 1 MB of memory ?

displacement
Explain the various
addressing schemes with the help of an
example each.

Calculate the physical address for the


following register offset pairs :

(i)

SS : SP = 0100h : 0020h

(ii)

DS : BX = 0200h : 0100h

(iii) CS : IP = 4200h : 0123h


(iv) ES : SI = 0300h : 0245h
3. (a) Explain the use of parity bit in error
detection with the help of an example using
odd parity scheme.
(b) Compare the following :
(i)

CD-ROM and DVD-ROM

(ii)

SRAM and DRAM

(iii) Memory mapped I/O and Isolated


mapped I/O
(c)

MCS-012

Explain the following 8086 instructions :


(i)

XCHG

(ii)

XLAT

P.T.O.

4.

(a) What is a Multiplexer ? Give block


diagram, truth table and logic diagram of a
4 x 1 multiplexer.

Explain any three techniques of identifying


the device that has caused the interrupt.

Write a program in 8086 Assembly


language for displaying the contents of
CL register.

(b)
(c)

5.

Explain the following with the help of an example

5x4=20

or diagram for each :


(a)

T flip-flop

(b)

DMA

(c)

COM programs

(d)

The stack

(e)

LCD

MCS-012

19,000

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