System Architecture and memory

System Architecture and memory

1. Memory

   • ROM
     • Non-volatile
     • Start up instructions
     • primary storage
   • RAM
     • Volatile
     • Running programs
   • Cache
     • Level 1
       • fastest
     • Level 2
     • Level 3
       • biggest
     • makes loading things quicker
   • Virtual memory
     • extra space for when the RAM is full
   • Flash memory
     • long term storage
     • SD cards, USB stick
   • Primary memory
     • Volatile
   • Secondary memory
     • non-Volatile
     • Long term

2. ALU

   • Processes logical/mathematical problems

3. CPU

   • Cores
     • More cores means more FDE cycles at one time
   • clock speed
     • faster clock speed means more FDE cycles
     • How many FDE a second
   • Fetch, Decode, Execute
     • getting and doing tasks

4. Control unit

   • Controls the flow of data

5. Registers

   • Small amounts of high speed memory
   • In the CPU