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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2010/
Module Title: Computer Architecture
Module Code: COMH
School: Computing
Programme Title: Higher Certificate in Science in Computing in Information Technology Support Bachelor of Science in IT Management Bachelor of Science in Computing Bachelor of Science in Software Development Bachelor of Science in Software Development with Computer Networking Bachelor of Science (Honours) in WEB Development
Programme Code: KITSU_6_Y KITMN_8_Y KCOMP_7_Y KSDEV_8_Y KDNET_8_Y KWEBD_8_Y
External Examiner(s): Mr. A .O’Leary Internal Examiner(s): Mr. S. Lankford Dr. J. Creagh Mr. D. Long Mr. J. McInerney
Instructions: Answer Question 1 and TWO other questions.
Duration: 2 Hours
Sitting: Autumn 2011
Requirements for this examination: Answer Question 1 and TWO other questions.
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.
a) Describe the interactions between the different parts of the operating system and an application such as Microsoft Word when a user edits a letter. (7 marks)
b) Describe what is meant by virtual memory and where can it be found? (7 marks)
c) Using truth tables, prove the following theorems of De Morgan.
i. A B A. B ii. A. B A B (7 marks)
d) Using a K-map, derive the minimal Boolean expression for the following truth table:
A B C Output 0 0 0 X 0 0 1 0 0 1 0 0 0 1 1 X 1 0 0 0 1 0 1 0 1 1 0 X 1 1 1 1 (7 marks)
e) What is meant by the term Overflow when talking about One's and Two’s complement as a means of representing integers. Do computers handle this problem well? (6 marks)
f) Perform the following arithmetic, using 8 bits and using One’s complement representation:
a) Convert the Hexadecimal code, FFE 16 , into its corresponding Decimal value (4 marks)
b) i) Convert the following from Hexadecimal to Binary: B7 16 (3 marks) ii) Convert the following Decimal to BCD code: 1310 (3 marks)
c) What are Grey codes and when are they used? (4 marks)
d) What is the range of numbers, using n bits, in Signed Magnitude representation? (3 marks)
e) In computer systems, why is the 2s complement number system preferred over the Sign and Magnitude number system? (3 marks)
f) Assume the following 32-bit floating-point representation:
Using this format, code the following in floating point format: -6.125 (10 marks)
sign bit of mantissa 8 bit exponent in two’s complement 23 bit mantissa
