Microprocessor and Computer Architecture — CACS155 (2nd Sem, Paper 2)

a Tribhuvan University Xow Faculty of Humanities & Social Sciences ey 2021 Bachelor in Computer Applications Full Marks: 60 Course Title: Microprocessor & Computer Architecture Pass Marks: 24 Code No: CACS155 Time: 3 hours ‘ _ Semester: II Candidates are required to answer the questions in their own words as far as possible. . Group B Attempt any SIX questions. [6x5 = 30] 2 What is the use of flag? Explain different flags of 8085 with an example. — pelt] 5. Draw the timing diagram of LXI H, 5070H instruction. = =~ [5] 4. Explain how does control unit determines the type of instruction after it is read from memory. [5] a What is microprogram sequencer? Differentiate between hardwired control unit and microprogrammed control unit. : [2+3] ; 6. What are the basic differences between a Branch instruction, a call subroutine instruction, and ——__—_—— program interrupt? [5] ‘ What do you mean by pipelining hazards? Explain briefly. [Si S Write short notes on: [22-5] a) Vector Processing _b) Addressing modes of 8085 Group C Attempt any TWO questions. [2x10 = 20] | 9. Define symbolic microprogram. you have a list of data stored at memory location starting at 8050H. The end of the data array is indicated by data byte 00H. Write a program to add the set of readings. Store the sum at 9050 and total carry at 9051H. [248] 10. Write a program to evaluate the arithmetic statement: , X= noe a) Using a general register computer with two address instructions. | [3] b) aoa an accumulator type computer with one address instructions. [3] ea e structure of control unit and its basic requirement. [2+8]