Unit Content

Data Representation

• Describe and exemplify the use of binary to represent positive integers.
• Describe floating point representation of positive real numbers using the terms mantissa and exponent.
• Convert from binary to denary and vice-versa.
• Describe extended ASCII code (8-bit) used to represent characters.
• Describe the vector graphics method of graphic representation for
  common objects:
   rectangle
   ellipse
   line
   polygon
• with attributes:
   co-ordinates
   fill colour
   line colour
• Describe the bit-mapped method of graphics representation.

Computer Structure

Describe the purpose of the basic computer structure architecture components and how they are linked together:

• processor (registers, ALU, control unit)
• memory locations with unique addresses
• buses (data and address)
• Explain the need for interpreters and compilers to translate high-level program code to binary (machine code instructions

Environmental Impact

Describe the energy use of computer impact systems, the implications on the environment and how these could be reduced through:

• settings on monitors
• power-down settings
• leaving computers on stand-by

Security Precautions

• Describe the role of firewalls.
• Describe the use made of encryption in electronic communications.