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Posted By: yamini Member Level: Gold Posted Date: 13 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Information Technology II II IT,CSE computer graphics aug/sep 2007 set I Question paper
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Code No: R05220504 Set No. 4
II B.Tech II Semester Supplimentary Examinations, Aug/Sep 2007
MICROPROCESSORS AND INTERFACING
( Common to Computer Science & Engineering, Information Technology
and Computer Science & Systems Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Explain what are the advantages of the memory segmentation. Discuss about
various segment registers in 8086.
(b) Explain the physical memory organization in 8086. How is it di er from 8088.
[8+8]
2. (a) Write an ALP to move the contents of a block of memory to another area in
the memory. (Assume no over lapping).
(b) What is a stack? Explain 8086 instructions for pushing and popping data on
stack. [8+8]
3. (a) Using Loop instruction write a sequence to add two 16 digits 10’s complement
packed BCD numbers. Repeat for unpacked BCD numbers.
(b) Explain with illustrations conversion of an ASCII- coded decimal number into
its binary equivalent. [8+8]
4. (a) What are the registers available in 8257? What are their functions?
(b) Draw and discuss the status registers of 8257? [8+8]
5. (a) What is sensor matrix mode of 8279? Describe the function of the 8x8-bit
RAM in the sensor matrix mode.
(b) Interface the keyboard and display controller 8279 with 8086 at address ABC0H.
Write an ALP to set up 8279 in scanned keyboard mode with encoded scan,
N-key rollover mode. Use 16-character display in right entry display format.
[8+8]
6. Explain the following modes of operation of 8259.
(a) Fully nested mode
(b) Rotating priority mode
(c) Special masked mode, and
(d) Polled mode. [4 × 4]
7. (a) What are the MODEM standards? Explain why a MODEM is required to
send digital data over standard telephone-lines.
(b) Show the bit pattern for the mode word and the command word that must
be sent to an 8251 to initialize the device as follows: Baud rate factor of 16,
5-bits per character, odd parity, 1 1/2 stop bits, transmit interrupt enabled,
DTR and RTS asserted, Error flags reset, send break character. [8+8]
8. Draw the port pin circuits of all the ports of 8051 and explain about each port pin
circuit clearly. [16]
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