No.
of Printed Pages : 4 MCS–202
POST GRADUATE DIPLOMA IN
COMPUTER APPLICATIONS
(PGDCA–NEW)
Term-End Examination
December, 2023
MCS-202 : COMPUTER ORGANISATION
Time : 3 Hours Maximum Marks : 100
Weightage : 70%
Note : Question Number 1 is compulsory and
carries 40 marks. Attempt any three
questions from Question No. 2 to Question
No. 5.
1. (a) Perform the following operations using
signed 2’s complement notation of 8-bits,
(including the sign bit). You must indicate
overflow or no-overflow and the reasons
thereof : 6
(i) Add + 69 and + 59
(ii) Subtract 90 from – 38
(iii) Add – 76 and + 86
P. T. O.
[2] MCS–202
(b) Simplify the following function using
Karnaugh’s map : 5
F (A, B, C, D) = Σ (2, 3, 6, 7, 9, 10,
11, 12, 15)
Draw the logic diagram of the simplified
function using AND, OR and NOT gates.
(c) What is the need of Cache memory ?
Explain the associative mapping scheme of
Cache memory with the help of an
example. 5
(d) Explain with the help of a flowchart how
Interrupt-driven Input/Output technique is
used to perform input function. 5
(e) Explain the following addressing modes
with the help of one example each : 6
(i) Register indirect addressing
(ii) Base register addressing
(iii) Direct addressing
(f) What is instruction pipelining ? Explain
with the help of a diagram. 4
(g) What are the segment registers in 8086
microprocessor ? Explain their uses with
the help of an example. 4
[3] MCS–202
(h) Write a program in 8080 assembly
language that finds the largest of two byte
numbers stored in the memory. The
program then subtracts smaller number
from the larger number. The result is left
in AX register. 5
2. (a) Explain the Von-Neumann architecture.
How is it different than the Harward
architecture ? 5
(b) Explain different components of a floating
point number. How are they different than
the fixed point numbers ? 5
(c) Draw the S-R latch using NOR gates and
explain its functioning. Also make the
characteristic table of S-R flip-flop. 5
(d) Draw the truth table and block diagram for
synchronous counter. Explain its
functioning. 5
3. (a) Explain the term access time in the context
of a hard disk. Also differentiate between
CLV and CAV in the context of secondary
storage technologies. 5
(b) Explain the set-associative cache mapping
scheme. 6
(c) What is DMA ? Explain the structure of
DMA module with the help of a block
diagram. 5
P. T. O.
[4] MCS–202
(d) Explain the following terms in the context
of Input/Output technologies : 4
(i) Colour depth
(ii) Non-impact printers
4. (a) Explain the steps of subroutine call and
return instructions with the help of an
example. Assume suitable register set. 4
(b) What is a micro-operation ? Explain
register-transfer, arithmetic and logic
micro-operations with the help of an
example. 7
(c) Explain the features of RISC processors. 4
(d) Explain the operations of micro-
programmed control unit with the help of a
block diagram. 5
5. (a) Explain the following in the context of
8086 microprocessor : 15
(i) Bus interface unit
(ii) Tools for assembly language
programming
(iii) Interrupt processing in 8086 micro-
processor
(b) Write a program in 8086 assembly
language that converts an ASCII digit
stored in a memory location into its
equivalent binary. 5
MCS–202
