BIT 2nd Semester
Microprocessor and Computer Architecture Board Question Paper 2079

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BIT 151-2079 ✡
Tribhuvan University
Institute of Science and Technology
2079
✡
Bachelor Level/First Year/Second Semester/Science
Bachelors in Information Technology (BIT 151)
(Microprocessor and Computer Architecture)
Full Marks:60 Pass Marks:24 Time:3 hours

Candidates are required to give their answers in their own words as for as practicable.
The figures in the margin indicate full marks

Section A
Long Answer Questions
Attempt any Two question.
[2x10=20]
1.

What is 8085 microprocessor? Explain the functional units of 8085 microprocessor in brief.

2.

Draw the block diagram of Hardwired control unit and explain their functional units in brief.

3.

State an algorithm for the restoring division method of fixed point binary division. Show the step-by step division process using restoring division algorithm when 448(01110 00000) is divided by 17(10001). Use 5-bit register to represent the numbers.

Section B

Attempt any Eight questions

[8x5=40]
4.

What is the difference between SAP-1 and SAP-2?

5.

What is instruction cycle? If the clock frequency is 5 MHz, how much time is required to execute an instruction MVI A, 08H?

6.

What is Microoperations? Explain the function of each following microoperations

AR ← PC
DR ← M[AR], PC ← PC+1
AR ← DR(0 - 10), CAR(2 - 5) ← DR(11 - 14)

7.

What is Instruction Format of basic computer architecture? A computer uses a memory unit with 256K words of 32 bits each. Draw the instruction word format and indicate the number of bits in each part.

8.

Write a 8085 assembly language for division of two 8-bit numbers by repeated subtraction method.

9.

Explain the use of mapping table.

10.

What is the difference between isolated I/O and memory-mapped I/O? What are the advantages and disadvantages of each?

11.

What is pipelining? Explain the role of pipelining in computing.

12.

Write short notes on:
a. Multiplexed Address
b. Memory Hierarchy