Code: D-10                                                                     Subject: COMPUTER ENGINEERING

Time: 3 Hours                                                                                                     Max. Marks: 100

NOTE: There are 11 Questions in all.

· Question 1 is compulsory and carries 16 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.

· Answer any THREE Questions each from Part I and Part II. Each of these questions carries 14 marks.

· Any required data not explicitly given, may be suitably assumed and stated.

Q.1       Choose the correct or best alternative in the following:                                           (2x8)

a. An optical input device that interprets pencil marks on paper media is

                  (A)  OMR.                                          (B)  Optical Scanner.

(C)  OCR.                                           (D)  Punch Card reader.

             b.   The octal equivalent of decimal number 28 is

                  (A)  32                                                (B) 34

(C)  36                                                (D) 40

             c.   In half duplex data can be transmitted in

(A) one direction only.                       

(B) both the directions, but not simultaneously.

(C) both the directions simultaneously.

(D) neither of the direction (i.e. data cannot be transmitted).

             d.   The maximum integer representable in a 16-bit word of a computer using sign magnitude scheme is

                  (A) .                                      (B) .

(C) .                                      (D) .

             e.   A dumb terminal has

(A)  an embedded processor.             

(B)  high amount of main memory.

(C)  a keyboard and a screen.             

(D)  independent processing capability.

             f.    Which of the following operation is performed by the instruction ADD B of 8085.

(A)  adds the contents of register B to B and store the result in register        B (B  B + B).         

(B)  adds the contents of register A to B and store the result in register       A (A  A + B).

(C)  adds the contents of register A to B and store the result in register           B (B  A + B).     

(D)  adds the contents of register A to A and store the result in register           B (B  A + A).

             g.   An operating system

(A) links a program with sub programs.   

(B) enables the programmer to draw a flowchart.                                       

(C) provides a layered user friendly interface.       

(D) converts a high level language to low level.

             h.   Which of the following memory is based on the concept of ‘locality of reference’?

                  (A)  Cache                                          (B) Associative

(C)  Virtual                                          (D) Main memory

PART I

Answer any THREE Questions. Each question carries 14 marks.

Q.2     a.   Given a memory with 14-bit address and 8-bit data                                                

(i) How many bytes can be stored in this memory

(ii) If this memory was constructed from bit RAM, how many chips would be needed.                                   (4)

             b.   What is Read Only Memory?  Name different types of ROM’s.  Is ROM a random access memory?                                                                    (5)

             c.   What is DVD ROM?  What is the difference between CD ROM and DVD ROM?  What is the major application of DVD ROM?                  (5)

Q.3     a.   Convert decimal 13.25 to binary.                                                                       (4)

b. Find the decimal equivalent of hexadecimal number 2BA5.                                  (3)

c. Divide  by .                                                                                 (3)

d. Convert 1010010 binary number to Gray Code.  Why Gray Code is said to have reflective characteristics.                                                            (4)

Q.4     a.   Explain the terms: instruction cycle, machine cycle and T-states.  Draw and explain the timing diagram for opcode fetch cycle for Intel 8085.        (8)

             b.   Discuss the advantages of RISC processors over CISC processors.                   (6)

Q.5     a.   Compare the features of 8086 with the features of 8085.                                    (4)

     b.   Differentiate between program counter and stack pointer.  Write the assignment of each bit of the flag register of 8085.                                  (4)

             c.   Write down the functions of following pins of 8085.

                   (i)    Ready.                                         (ii)  IO / .

                   (iii)  Clk out.                                                                                                       (6)

  Q.6           a.                                                        What are the three main IC’s of EISA 82350 chipset?  Explain them in brief.                                                                                                              (6)

b.   Name at least two processors in each of the category of 8-bit, 16-bit, 32-bit and 64-bit CPU’s.                                                                (4)

c.   Write down the salient features of

                   (i)  80486 CPU.

                   (ii) 80386 CPU.                                                                                                 (4)

PART II

Answer any THREE Questions. Each question carries 14 marks.

Q.7     a.   What is the difference between

(i) High level language and machine language.

(ii) Hardware and firmware.

(iii) Intelligent systems and smart systems.

(iv) SIMD systems and MIMD systems.                                                     (12)

             b.   Write a brief note on Dot Matrix printer.                                                             (2)

Q.8     a.   What is the function of cache memory?  What is the need of cache controller?                    (5)

             b.   What is the function of counter/timer chip 8253 / 8254?                                      (5)

c.   What is Interrupt Service Routine (ISR)?  Explain the steps taken by 8085 in response to the interrupt.                                                                  (4)

Q.9     a.   What do you understand by RAM?  Discuss the following types of RAMs

                   (i)    EDO.                                           (ii)   SDRAM.                  

                   (iii)  Dual Ported RAM.                       (iv)   DIMM.                                          (8)

             b.   Show the contents of all registers (A, B, C, D, E, H, L) as each of the following instructions is being executed

                   MVIC, FF

                   LXIH 8070

                   LXID 9082

                   MOV M, C

                   LDAX D

                   HLT                                                                                                          (4)

c.   Identify the memory locations that are cleared by the following instructions:

MVIB, 00

                LXIH 2060

                MOV M, B

INX H

                MOV M, B

                HLT                                                                                                             (2)

Q.10           a.                                                        Can 8 LED’s be interfaced to 8085 using 8255.  If yes, explain how?                                                            (2)

             b.   What is the difference between parallel and serial data transfer?  To which category does RS232 belong?  Write its salient features.                      (8)

c.   Explain the following addressing modes of 8086 with examples

(i)    Based addressing.

(ii)   Indexed addressing.                                                                                   (4)

Q.11                                                                      Write short notes on (any FOUR) :             

(i) Windows.

(ii) Virtual memory.

(iii) Magnetic memories.

(iv) Cyrix processors.

(v) ISA bus.

(vi) DMA Controller.                                                                  (4 x 3.5 = 14)