CPU

CPU

1. immediate access store

   • This holds the data and programs needed at that instant by the Control Unit

2. clock speed

   • measured in GHz
     • 1000 million in second

3. cache

   • high speed memory
     • more memory the faster it will be

4. control unit

   • recievies instruction from RAM and directs

5. number of cores

   • does improve the speed
     • not twice as fast

6. fetch, decode, execute cycle

   • work out what to do
   • process it
   • fetch instructions/data from RAM

7. ALU(arithmetic logic unit)

   • does all the maths

8. ROM

   • read-only memory
   • ROM is a special kind of memory which stores the instructions which the computer uses when it 'boots up'
   • ROM is that the data is not erased when the computer is switched off - the data is stored permanently
   • non volatile memory

9. hard dISK

   • The main internal backing store is a computer's hard disk.
   • stores the operating system
   • stores software and application

10. brain of the computer