Microprocessor and Computer Architecture 2080

Section A

Long Answer Questions
Attempt any TWO questions. [2 × 10 = 20]

1. What are Addressing Modes? Explain each with an example. Explain the function and type of addressing mode with the reason for the instruction STA 4000H. [10]

2. What is the control unit of a microprocessor? Draw the block diagram of the hardwired control unit and explain the function of each unit in brief. [10]

3. What is pipelining? Define instruction pipeline and explain the four-segment instruction pipeline. [10]

Section B

Short Answer Questions
Attempt any EIGHT questions. [8 × 5 = 40]

4. What is a Microprocessor? What are the three general categories of the function of a microprocessor? Explain in brief. [5]

5. Write an 8085 assembly language program to add two numbers located at 2030H and 2040H. Store the sum in the address 2050H. [5]

6. Design a 4-bit combinational circuit decrementer (A1 ← A1 - 1) using four full-adder circuits. Explain the circuit. [5]

7. What is the 'Selective Set' logical operation? Draw the hardware circuit of the 'Selective Set' logical operation. [5]

8. Show the step-by-step division process using the 'Restoring Division Algorithm' of 194 ÷ 10 (AQ = 10100011 by B = 1011). [5]

9. Explain the difference between isolated I/O and memory-mapped I/O. What are the advantages and disadvantages of each? [5]

10. What is Virtual Memory? Explain in brief. [5]

11. What do you understand by a microprogrammed control computer? Explain main memory and control memory of a microprogrammed controlled computer. [5]

12. Write short notes on:

• a. Performance of a pipelined processor
• b. Page Replacement