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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2009/
Module Title: Computer Architecture
Module Code: COMH
School: School of Computing & Mathematics
Programme Title: Higher Certificate in Science in Computing in Information Technology Support – Stage 1 & ACCS Bachelor of Science in Computing – Stage 1 Higher Certificate in Science in Computing - Stage 1 Bachelor of Science (Honours) in Software Development & Computer Networking - Stage 1 Bachelor of Science (Honours) in Software Development - Stage 1 Bachelor of Science (Honours) in IT Management
Programme Code: KITSU_6_Y1, KITSE_6_Y1, KCOMP_7_Y1, KCOME_6_Y1, KDNET_8_Y1, KSDEV_8_Y1, KITMN_8_Y
External Examiner(s): Mr. A. O’Leary Internal Examiner(s): Mr. D. Long, Mr. S. Lankford, Mr. J. McEnery
Instructions: Answer Question 1 and TWO other questions.
Duration: 2 hours
Sitting: Winter 2009
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator.
Q1.
a) Briefly explain what is meant by the following terms: i. Control Unit ii. ALU iii. Program Counter. (7 marks)
b) What is meant by term “Cache” and where is found in modern computer systems? (7 marks)
c) Using truth tables, prove the following theorems of De Morgan:
i. x + y = x. y
ii. x. y = x + y (7 marks)
d) Using a K-map, derive the minimal Boolean expression for the following truth table:
A B C Output 0 0 0 1 0 0 1 0 0 1 0 X 0 1 1 1 1 0 0 1 1 0 1 0 1 1 0 1 1 1 1 X (7 marks) e) Briefly explain the following terms: i. ASCII ii. Parity (6 marks)
f) Perform the following arithmetic, using 8 bits and using two’s complement representation: 29 - 17 (6 marks)
Q4. a) Convert the Decimal value, 273 10 , into its corresponding BCD code. (4 marks)
b) i) Using n bits, what is the range of numbers that can be represented by the following: a. Ones Complement number system b. Twos Complement number system (3 marks)
ii) Convert the following from Binary to Hexadecimal 11011011001101112 (3 marks)
c) If the following Hamming code message, (i.e. including both data and parity bits) was received what comment could be made about the message?
011110100101101 (10 marks)
d) Assume the following 32-bit floating-point representation: (10 marks)
Using this format, code the following value in floating point format -23.
Sign bit of mantissa 8 bit exponent in two’s complement 23 bit mantissa
