Madras University (UnOM) 2006 B.A Computer Science University fo Madras - Question Paper

NOVEMBER 2006 MICRO PROCESSOR 46004/PC4A
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Time: 3 hours Maximum : 100 marks

PART A---(10*3=30 MARKS)

Answer any TEN ques..
1.Is microprocessor 'Programmable'? Why?
2.What is "Monitor Program"?
3. What is the need of control bus in microprocessor?
4.Give 3 examples for one-byte instruction and
how they are categorised so?
5.What are the flags used in conditional jumps?
6.Give the full format and addressing mode of the
provided instructions
(a)STAX
(b)LDA
(c)CPI
7.What is a "Counter" and name any 2 uses of it?
8.Wha tis the usage of PUSH and POP?
9.What are the 4 programming techniques used for
code conversion?
10.Differentiate Maskable and Non-Maskable interrupts.
11.Write a shortly on RIM.
12.What is "DMA"?

PART-B--(5*6=30 MARKS)
Answer any 5 ques.

13.Give the block diagram of a computer and discuss.
14.Explain how a memory learn operation is done in 8085.
15.Give the sytax of any 3 logical instructions and discuss.
16.How does a microprocessor differentiate ranging from
data and instruction?
17.Explain the process time delay with 1 register.
18.Explain the usage of "Stack pointer".
19.Write shortly on the BCD to seven-segment LED codeconversion.

PART-C--(4*10=40MARKS)
Answer any TEN ques.
20.Give the interrupts of 8085 and discuss.
21.The subsequent block of data is stored in
the memory locations from XX55H TO XX5AH.
Transfer the data to the locations
XX80H to XX85H in the reverse order
22.Write instructions to load 2 unsigned numbers in
register B and register c, respectively.
Subtract (c) from (B). If the outcome is in
2's complement convert the outcome in absolute magnitude
and display it at PORT 1; otherwise, display the positive outcome.
23.Give the functional block diagram of 8085 microprocessor
and discuss the functions.
24.Write a subroutine to set the zero flag and check
whether the instruction JZ functions properly,
without modifying any register contents other than flags.
25.Design a hexadecimal counter and discuss.

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Earning:   Approval pending.