1_Hardware

1_Hardware

1. CPU

   • ALU(arithmetic logic unit)
     • does all the maths
   • Immediate access store
     • Register
   • Control Unit
     • Receives instruction from RAM and directs
   • Clock speed
     • measures in GHz
       • 1000 million per second
   • Cache
     • High speed memory
       • More memory the faster it will be
   • Number of cores
     • Not twice as fast
     • Does improves the speed
   • Fetch, Decode, execute cycle
     • Fetch instructions/data from RAM
     • Work out what to do
     • Process it

2. Secondary storage

   • Magnetic
   • Optical
   • Solid state

3. Memory

   • cashe
   • Virtual
   • Ram - volitile
   • ROM - boot sequence
   • Flash - USB

4. Binary Logic

   • Allow use of logic gates
     • AND
     • OR
     • NOT
   • High tolerance
     • Stop mistakes
   • Computer components use 0 and 1(on and off)

5. User with special needs

   • Braille keyboard
   • Eye typer
   • Speech recognitation