1. Computer Systems

Data representation – Arrangements

  • Representation of positive numbers in binary including place values and range up to and including 32 bits
  • Conversion from binary to decimal and vice versa
  • Description of the representation of negative numbers using two’s complement using examples of up to 8 bit numbers
  • Description of the relationship between the number of bits assigned to the mantissa/exponent and the range and precision of floating point numbers
  • Conversion to and from bit, byte, Kilobyte, Megabyte, Gigabyte, Terabyte. (Kb, Mb, Gb, Tb)
  • Description of Unicode and its advantages over ASCII
  • Description of the bit map method of graphic representation using examples of colour/greyscale bit maps
  • Description of the relationship of bit depth to the number of colours using examples up to and including 24 bit depth (true colour)
  • Description of the vector graphics method of graphic representation
  • Description of the relative advantages and disadvantages of bit mapped and vector graphics
  • Description of the relationship between the bit depth and file size
  • Explanation of the need for data compression using the storage of bit-map graphic files, as examples