Osmania University (OU) 2006-1st Sem B.E Electronics & Tele-Communication Engineering 3/4 (E.C.E)(ESTER)SUPPLEMENTARY ,IL, computer organisation and microprocessors - Question Paper
B.E 3/4 (E.C.E)(I-SEMESTER)SUPPLEMENTARY EXAMINATION,APRIL,2006
computer organisation and microprocessors
Code No.: 10294/A
FACULTY OF ENGINEERING
B.E. ra/IV Year (ECE) I Semester (Sulemeotaiy) Examination, May 2006
COMPUTER ORGANISATION AND MICROPROCESSORS Time : 3 Hours1 [Max:. Marks : 75
Answer all questions of Part A.
Answer five questions from Part B.
Part A - (Marks : 25)
1. What is an addressing mode? Mention different types of addressing modes with necessary examples. 3
2. Derive the bar correct floating point number representation for the decimal number +3.25 and-3.25 using the 32-bit floating point standard. 3
3. Distinguish between memory mapping and I/O mapped I/O schemes. 2
4. How the memory hierarchy is used to obtain a high performance at reduced cost for a computer? 2
5. Write the classification of instruction set of 8085 and give examples in each case. 3
6. Assume that memory location 2345H has a data byte of 67H. Specify the contents of address bus A15 - Ag and multiple bus AD7 - ADO. when 8085 assert no RD signal. 2
7. What are the various modes of operation of 8253 timer? 2
8. Show the interfacing circuit of 8085 with a keyboard matrix indication functional lines. 3
9. How does the pipe lining improves the performance of a machine? 2
10. Mention important functions of an operating system. 3
Part B - (Marks : 5 x 10 = 50}
11. (a) Explain the concept of Von-Nuemann machine. What are its drawbacks? 4
(b) What is an instruction format? How does the instruction format influences the architecture and hence the performance of computer? v 6
12. (a) What is interrupt system? How does this improve the through put of a
microprocessor? Explain the interrupt feature provided in microprocessors and the process involved in its servicing. 7
(b) Distinguish various types of printers. 3
13. (a) Briefly explain the coocept of virtual memory. 6
A two level memory system has its access NJ'sec. and 10 sec. respectively. Average access time of thehierarchy is iOsec.Whaf Is the bit ratio and how to
reduce the average access time from 104 to 10'5 sec. 4
14. Explain the following instructions of 8085. 10
(a) SIM (b) RIM (c) DWV (<U,FCHL {e) RAR
15. (a) Draw a timing diagram of each and explain the following instructions. 6
(i) MOV A.M (ii) IN01H
(b) ExplainHie interrupt structureto 8085. , 4
l!6. Draw the functional chematip.to interface,8-bitDAC to 8085 through 8255 and write an ALP to generate tjqUngujLar warn optptitv ; , 10
17. (a) Compare the features of RISC andCISC machines. 5
(b) Explain the importance of BlOS in syStem programitiing. 5
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