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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Autumn Examinations 2011/
Module Title: Computer Architecture
Module Code: COMH
School: Computing
Programme Title: Higher Certificate in Science in Computing in Information Technology Support – Year 1 Bachelor of Science in IT Management – Year 1 Bachelor of Science in Computing – Year 1 Bachelor of Science in Software Development – Year 1 Bachelor of Science in Software Development with Computer Networking – Year 1 Bachelor of Science (Honours) in WEB Development – Year 1
Programme Code: KITSU_6_Y KITMN_8_Y KCOMP_7_Y KSDEV_8_Y KDNET_8_Y KWEBD_8_Y
External Examiner(s): Ms. Erica Gill 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 2012
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.
Q1.
a) What code is generally used to represent characters? Why is this code generally not used to represent integers? (7 marks)
b) For what type of applications is BCD used? Convert the following into BCD format: 42710 (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 0 1 0 0 1 1 0 1 0 1 1 0 0 1 1 1 0
(7 marks)
e) Compare one’s complement with two’s complement as a means of representing integers. Which form is better and why? (6 marks)
f) Perform the following arithmetic, using 8 bits and using Two’s complement representation: 8 - 19 (6 marks)
Q4. a) Convert the Binary number 1110 2 into its corresponding GRAY code. (3 marks)
b) i) Convert the following from Hexadecimal to Binary 1ABF 16 (3marks)
ii) Convert the following to Octal format: 101111011102 (3 marks)
c) Determine the Hamming code for the following information bits, 11001011010 (9 marks) d) Assume the following 32-bit floating-point representation:
Using this format, code the following in floating point format: -37.0625 (9 marks)
sign bit of mantissa 8 bit exponent in two’s complement 23 bit mantissa
