Mahatma Gandhi University B.Sc Computer Science Microprocessors and Assembly Question Paper of Fourth semester 2013

University:  Mahatma Gandhi University
Course:  B.Sc
Subject : Computer Science Microprocessors and Assembly
Year of  Question Paper : 2013


C.B.C.S.S B.Sc Degree Examination, April 2013
Fourth Semester
Computer Science
Complementary Course – Microprocessors and Assembly Language Programming
Time : Three Hours
Total Weight : 25
Part A
Answer all questions
Each bunch of four questions carries a weight of one
Fill in the Blanks:
I)
1. 8086 has ________ address lines.
2. High performance engineering work stations often us ____instruction set computers.
3. The address bus of 80386 is ______ bits wide.
4. The condition of status flag is ________ when write operation is performed by 8086.
II)
5. Virtual memory capacity of 80286 is _______.6. ________ chip is used as a timer.
7. 80386 is a _______ bit processor.
8. 8086 can address upto _______ physical memory locations.

Objective type question:
III)
9. What is output of the following code AX = 37D7H, BH = 151 decimal DIV BH
(a) AL = 65H, AH= 94 decimal (b) AL= 5EH, AH= 101 decimal (c) AH= E5H,
AL= 5EH (d) AL= 56H, AH= 5EH
10. Which interrupt has the highest priority?
a) INTR b) TRAP c) RST6.5 d) RST 7.5
11. Which are software interrupts?
a) RST 0 - 7 b) RST 5.5 - 7.5 c) INTR d)TRAP
12. BHE of 8086 microprocessor signal is used to interface the
a) Even bank memory b) Odd bank memory c) I/O d) DMA
13. How many pins do an 80386DX has
(a) 128 (b) 132 (c) 64 (d) 120
14. In 8086 the overflow flag is set when
a) The sum is more than 16 bits b) Signed numbers go out of their range after an arithmetic operation c) Carry and sign flags are set d) During subtraction
15. To put the 8085 microprocessor in the wait state
a) Lower the-HOLD input b) lower the READY input c) raise the HOLD input d) raise the READY input
16. The 4004 microrprocessor was released in the year of:
a.) 1964 b.) 1968 c.) 1972 d) 1971

Part B
Answer five questions out of eight
Each bunch of four questions carries a weight of one

17. Describe the difference between instructions MOV AX, 2437H and MOV AX, [2437H]?
18. What is the advantage of using assembly language instead of writing program in machine language?
19. Compare 8086 and 8088 µp's?
20. Compare memory mapped I/O and peripheral mapped I/O?
21. Write notes on segment registers of 8086?
22. What is pipelining?
23. What factors determine how much physical memory an 80286 can address?
24. Write a delay loop which produces a delay of 500 µs on an 8086 with a 5 MHz clock?

Part C
Answer four questions out of six
Each bunch of four questions carries a weight of two
25. Describe how an assembly language program is developed and debugged using system tools such as editors, assemblers, linkers, locators emulators and debuggers?
26. Define the term reentrant and explain how you must pass parameters to a procedure so that it is reentrant?
27. Write notes on directives?
28. Write the differences between minimum mode and maximum mode operations of 8086.
29. Describe the paging concept of 80386?
30. Write note on MACROS?
Part D
Answer two questions out of three
Each bunch of four questions carries a weight of four

31. With a neat Block diagram explain the architecture of 8085µp?
32. With a neat block diagram explain 8257?
33. Describe the bus activities during read machine cycle? ..

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