Computer Science

Computer Science

1. Topic 3

   • Programming languages
   • Software
   • Hardware
     • CPU
       • Clock synchronsises
       • CU controls everything
       • ALU arithmatic
       • Registers fast memory
     • Buses
       • Address bus holds address of data
       • Data bus holds value
       • Control Bus identifies when to red and write
     • Secondary storage
       • Magnetic
         • Disk
         • Magnetised is a 1
         • Non magnetic is 0
       • Solid state
         • No moving parts
         • Pools with electrons
         • no charge electrons is 0
         • charged electrons is 1
       • Optical
         • CD
         • reflects light
         • pit does not reflect light
         • landing reflects light