Code: D-10                                                                    Subject: COMPUTER ENGINEERING

Time: 3 Hours                                                                                                      Max. Marks: 100

NOTE: There are 9 Questions in all.

· Question 1 is compulsory and carries 20 marks. Answer to Q. 1. must be written in the space provided for it in the answer book supplied and nowhere else.

· Out of the remaining EIGHT Questions answer any FIVE Questions. Each question carries 16 marks.

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

Q.1       Choose the correct or best alternative in the following:                                         (2x10)

a. The data bus is 

(A)  half duplex.                                   (B)  full deplex.

(C)   unidirectional.                              (D)  bidirectional.

b. Array processors are also called

(A) MIMD Computers                        (B)  MISD Computers

(C) SIMD Computers                        (D) SISD Computers

             c.   The Pentium Pro is a

(A) 32 bit CISC processor.                (B)  16 bit CISC processor.

(C)  24 bit RISC processor.                (D)  16 bit RISC processor.

             d.   The data received from SID pin of the CPU 8085 is loaded into the

(A)  5^th bit of accumulator.                  (B)  6^th bit of accumulator.

(C)  7^th bit of accumulator.                  (D)  0 bit of accumulator.  

             e.   Which of the following statement is not true

(A) 8086 has code segment register.

(B) 8086 has program segment register.

(C) 8086 has data segment register.

(D) 8086 has stack segment register.

             f.    EAPROM is a/an

(A) mechanical erasable PROM.

(B) ultraviolet erasable PROM.

(C) electrical erasable PROM.

(D) associative memory.

             g.   The data acquisition system act as

(A) an input device.                            (B) an output device.

(C) an display device.                          (D) a plotting device.

             h.   Synchronous data transfer scheme can be used when

(A) the speed of I/O devices and the microprocessor do not match.

(B) the speed of I/O devices and the microprocessor match.

(C) the speed of I/O devices is slower than the microprocessor

(D) the speed of I/O devices is faster than the microprocessor

             i.    The last occupied memory location of the LIFO stack is known as

(A) stack top.                                     (B) stack bottom.

(C) stack rear.                                     (D) stack front.

             j.    Which of the following statement is false?

(A) MCA and EISA architectures are completely compatible to each other.

(B) ISA has 24 address lines and 16 data lines.

(C) EISA bus architecture is suitable for a multi-user system.

(D) All the above statements are false.

Answer any FIVE Questions out of EIGHT Questions.

Each question carries 16 marks.

Q.2     a.   Define the following terms:

(i) Word length of a computer

(ii) MIPS                         

(iii) Super scalar processor

(iv) Firmware.                                                                                  (8)

             b.   Differentiate between the following:-

(i) Control flow and data flow computers.

(ii) Multiprogramming and multiprocessing.                                      (8)

Q.3     a.   Explain various 8085 microprocessor instruction formats with examples.             (8)

             b.   What do you understand by addressing modes? Write the various addressing modes of 8086 microprocessor and explain any two addressing modes with the help of examples.             (8)

Q.4     a.   Draw the timing diagram of MVI A, 12H                                                            (5)

b.   Explain the hardware interrupts of the 8086 microprocessor.                               (6)

c.   Write a brief note on 80386 CPU or 80486 CPU.                                             (5)

Q.5     a.   Discuss the method used to display a character on a CRT screen. What is the function of a character generator ROM? What is raster scan method  for displaying characters on the CRT screen.            (8)

     b.   What do you understand by DMA scheme of data transfer? Discuss its operating principle. Explain the various modes of 8237 DMA controller.                                                            (8)

  Q.6     a. What do you mean by subroutines and macros? What are the differences between subroutines and macros? Write the various situations where subroutines and macros are used.                                   (8)

             b.   What is an operating system? Write and explain any six commands of DOS with examples.             (8)

Q.7     a.   List and explain the various operating modes of programmable interval Timer/counter 8254.                                                                       (8)

b.   What is the need of having a bus a computer system? Explain any two of them (ISA/EISA/MCA/local bus) in brief.                                                (8)

Q.8     a.   Write an assembly language program to load hexadecimal numbers 9B and A7 in register D and E respectively and then add these numbers. If the sum is greater than FF store 01 in register B otherwise store the sum in register B.                                                                                          (4)

             b.   Write an assembly program to transfer the block of data, which is stored at 3050H to 3057H to the block of memory locations starting from 4498H.                                                              (4)

c.   Explain the concept of cache memory. Explain the terms: cache hit and cache miss. What is the role of a cache controller?                                 (8)

Q.9           Write short notes on (any FOUR)

(i) Applications of computers.

(ii) Serial data transfer.

(iii) Optical disks.

(iv) LINUX operating system.

(v) RS-232C standard.

(vi) Parallel processing.                                                                (4x4)