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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Autumn 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: Autumn 2010
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) Describe a typical sequence of events in an Operating System when a Word processor is loaded. (7 marks)
b) What 3 buses can be found in a computer system and describe their function? (7 marks)
c) Design and draw a binary Half Subtractor (i.e. a circuit that subtracts 2 bits) (7 marks)
d) Using a sum of products approach design a circuit which implements the following truth table:
A B C Output 0 0 0 1
0 0 1 1
0 1 0 0
0 1 1 0 1 0 0 0
1 0 1 1
1 1 0 0 1 1 1 0
(7 marks)
e) Using n bits, what is the range of numbers for a 2s complement number system? (6 marks)
f) Perform the following arithmetic, using 8 bits and using two’s complement representation:
25 - 14 (6 marks)
Q4. a) Convert the Binary number 1101 2 into its corresponding GRAY code. (4 marks)
b) i. Convert the Decimal value, 228 10 , into its corresponding EXCESS-3 code. (2 marks)
ii. Convert the following from Binary to Octal
1001011012 (2marks)
iii. Convert the following from Binary to Hex
10101111010100102 (2 marks)
c) Determine the Hamming code for the information bits, 10101010111 2. (10 marks)
d) Assume the following 32-bit floating-point representation: (10 marks)
Using this format, code the following value in floating point format 26.
Sign bit of mantissa 8 bit exponent in two’s complement 23 bit mantissa
