Dharmsinh Desai University Logical Organization of Computers 2008 Question Paper

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DHARMSINH DESAI UNIVERSITY, NADIAD

Third Sessional Examination [Semister : I (MCA)]

Subject: Logical Organization of Computers

Date: 11-12-2008 Time: 1 Hour Max Marks:36

Q.1 Answer the Following questions. [Marks : 12]

1 What is called negative edge triggering?

2 LSI Provides________, MSI Provides ___________ and VLSI Provides_______

maximum integrated gates.

3 A set of instructions is called _______________

4 There are different ___________ flags available in 8085 Microprocessor.

5 Multiple choice :

1 Data bus is a

a) Unidirectional b) Bidirectional c) Both

2 Control Bus has how many lines?

a) 8-bits b) 16-bits c) None of the above

3 Stack pointer consists total number of bits are

a) 8-bits b) 16-bits c) 32-bits

6 State True or False (Justify)

1) Program counter register store address of instructions

2) Two-Byte instructions stores opcode and operand in same memory location

3) In ripple counter pass clock signals to each flip flop

7 Match following table

Instructions Hex Code

ADD A 3EH

MVI A 87H

Q2. Answer the Following questions. [Any Three] [Marks 12]

A Discuss Master Slave Flip Flop with Diagram.

B Discuss BCD Ripple counter with appropriate logic gates.

C Explain data transfer and branch instruction set with appropriate example

D Draw a block diagram of RAM Memory unit and how to perform read operation.

E What is meant by Microprocessor? Draw 8085 microprocessor Hardware model

and explain functionality of each.

Q3. Answer the Following questions. [Marks : 12]

A Draw block diagram of memory cell [ 02 ]

B Discuss 4-bit binary Synchronous counter with appropriate logic gates. [ 05 ]

C Draw architecture of 8085 MPU and explain it. [ 05 ]

OR

A Check the addressing modes of the following instructions

1) LDAX B 2) LXI SP, 2000H 3) MOV A,B 4) LDA 2000H [ 02 ]

B Write a program to add two 8-bit data from memory location 0030H and 0031H.

Store result in accumulator register and Draw flowchart. [ 05 ]

C What is meant by shift register?

Explain Shift Right Operation with D-Flip Flop. [ 05 ]

---- BEST LUCK ----

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