Hardware

Hardware

1. CPU

   • ALU - arithmatic logic unit
     • does the maths
   • immediate access store
     • register
   • control unit
     • recieves instructions from RAM and directs
   • fetch, decode, execute cyle
     • process it
     • work out what to do
     • fetch instructions from RAM
   • number of cores
     • not twice as fast
     • dues improve speed
     • dual/quad/out
   • clock speed
     • measured - 1000 million in GHz per second
   • cache
     • high speed memory

2. users with special needs

   • speech recognition
   • eyetyper
   • braille keyboard

3. secondary storage

   • solid state
     • like USB
   • optical
     • colour
   • magnetic

4. memory

   • cashe
   • virtual
   • RAM
     • volitile
   • Flash
     • USB
   • ROM
     • Boot sequence

5. Binary logic

   • allows use of logic gates
     • AND
     • OR
     • NOT
   • high tolerance
     • stops mistakes
   • computer components use O & I (on and off)