Write an Assembly program to reverse the given string.
Subject
Microprocessor
This course contains of fundamental concepts of computer organization, basic I/O interfaces and Interrupts operations.
Tribhuvan University
Institute of Science and Technology
2080-new
Bachelor Level / second-semester / Science
Computer Science and Information Technology( CSC167 )
Microprocessor
Full Marks: 60 + 20 + 20
Pass Marks: 24 + 8 + 8
Time: 3 Hours
Candidates are required to give their answers in their own words as far as practicable.
The figures in the margin indicate full marks.
SECTON A
Attempt any TWO question.
1
Difference between 8085 and 8086 microprocessor. Explain the concept of demultiplexing of address bus and why is it required?
2
Write an Assembly program for calculating the factorial of a number using 8085 microprocessor.
3
Draw a block diagram of 80286 microprocessor and explain.
SECTON B
Attempt any EIGHT question.
4
What is paging? Explain the concept of memory access in protected mode.
5
What is the importance of direct memory access? Explain the mechanism of direct memory access.
6
List different types of ports. What are the main characteristics of programmable interrupt controller 8259A?
7
Difference between instruction cycle and machine cycle. Draw timing diagram of MVI A, 32 H.
8
9
Explain different tyes of system buses and also indicate wheather they are unidirectional or bidirectional.
10
What is the significance of interrupt masking? Difference between vectored and polled interrupt.
11
Illustrate memory access in GDT.
12
Write short notes on :
- Jumps
- Accmulator
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