



Computer Systems
eXercise #2
Representation
 Regarding the Standard Character set, there are a number of patterns
implicit within it
 How many ASCII numbers are between the LOWER case letter
and the UPPER case, and is this constant?
 In BINARY, how would the character sequence 'GIDDAY' appear
(assuming the MSB is set to a zero)
 Regarding the representation of INTEGERS,
 Why is SIGN MAGNITUDE a slightly 'unnatural' way of representing
numbers?
 How would the SIGNED INTEGER '6536' appear in binary using
SIGN MAGNITUDE?
 Using ONE'S COMPLIMENT, represent the SIGNED INTEGER
4242, then add it to the SIGNED INTEGER 4242 and comment on the
result?
 Verify that, under TWO's COMPLIMENT, the addition of
86 to +86 does infact add to ZERO
 In BCD
 How would the number 42 be stored
 Describe the ADVANTAGES of using BCD to represent numbers
 What is the main DISADVANTAGE of using BCD to represent numbers
 Real Numbers are often described 'approximations' when referring
to their storage on computers. Explain why this is so, using a representation
technique as the basis of your explanation.






