University of Madras
Chepauk, Chennai-600 005.
B.Sc Computer Science
(SAE2B)
November - 2011
PART A - (10 * 2 = 20 marks)
Answer any TEN Questions All Questions carry equal marks. 1. Convert decimal 19 to Binary. 2. What is Half-adder? 3. What is a decoder? 4. What is a register? 5. What are two main types of sequential circuits? 6. What is a binary counter? 7. What is microprocessor? Give an example. 8. What are the two types of unconditional jump instructions? 9. What is the use of delay subroutine? 10. Write delay subroutine using a single register. 11. Name the 8085 restart interrupts. 12. What is memory mapped I/O? PART B - (5 * 5 = 25 marks) Answer any FIVE questions. All questions carry equal marks. 13. Explain briefly the types of basic logic gates. 14. Explain the working of Half-subtractor with truth table and logic diagram. 15. Explain the working of clocked RS flip-flop. 16. Explain the working of shift register. 17. Explain the addressing modes of 8085 with examples. 18. Explain the uses of PUSH and POP instructions of 8085. 19. Write a short note on 8085 interrupts. PART C - (3 * 10 = 30 marks) Answer any THREE questions. All questions carry equal marks. 20. Simplify using K-map Y = F(A,B,C,D) = (0,2,5,7,8,10,13,15) 21. Explain the function of binary ripple counter with logic diagram. 22. Explain the architecture of 8085 with a neat block diagram. 23. Write an assembly program in 8085 to convert hexadecimal number into BCD. 24. How will you interface I/O devices with 8085? |