LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.C.A. DEGREE EXAMINATION – COMPUTER APPLICATIONS
SECOND SEMESTER – APRIL 2007
CA 2501 - COMPUTER ORGANIZATION AND ARCHITECTURE
Date & Time: 20/04/2007 / 1:00 - 4:00 Dept. No.
Max. : 100 Marks
PART – A
Answer all of the following:
10 x 2 = 20
1. Draw the logical diagram for the boolean function
F = ABC + ABC’ + A’C
2. Write the excitation table for RS flip flop.
3. Define Encoder.
4. Name the different types of ROM.
5. Define instruction code.
6. What are the different memory reference instructions?
7. What are the output’s of the control logic gates?
8. What are the i/p – o/p instructions?
9. What are the different types of instructions.
10. What are the 4 status bits.
PART – B
Answer all of the following:
5 x 8 = 40
11.a.Explain the block diagram of a digital computer.
(OR)
b. With a neat diagram explain SR flip flop and give its excitation table.
12.a.Explain the register with parallel load.
(OR)
b. Explain the octal to binary encoder with neat diagram.
13.a. Explain the different instruction code formats.
(OR)
b. Explain the various memory reference instructions.
14.a. Explain the control gates associated with AR.
(OR)
b. Explain the register reference instructions.
15.a. Explain the 3 types of CPU organization.
(OR)
b. Explain the different data transfer instructions.
BP 03
PART – C
Answer any TWO of the following:
(Each question carries TEN marks).
2 X 20 = 40
16.a Simplify using K map
i.
F(ABC) = Σ(1,3,4,5,6,7)
ii.
F(ABC) = Σ(0,2,4,6,7)
iii.
F(ABCD) = Σ(0,1,3,5,7,9,11,12,13,14,15)
iv.
F(ABCD) = Σ(2,3,4,5) + Σd(10,11,12,13,14,15)
b. Explain RAM and ROM in detail.
17.a.Explain the control unit of basic computer. Give the timing diagram.
b.
i.
ii.
Draw the circuits associated with AC.
Explain the gate structure that controls LD,INR,CLR i/p’s of AC.
18.a. Explain the different addressing modes.
b. What is a Stack? State the use of stack pointer and explain the 2 operations of stack with neat
diagram.
************