Parts of a computer

Parts of a computer

1. CPU

   • Fetch, decode execute
     • CPU fetches the top instruction and passes it on to the decoder. It is decoded and carried out
   • Processor speed
     • 1 hertz is one instruction carried out a second

2. Storage

   • ROM
     • Read only memory. It holds the program needed for switching on the computer (bootstrap/BIOS). It stores data permanently.  It checks if you've got a keyboard. If you haven't it says to press F5.

3. Main memory

   • RAM
     • Random access memory. It holds the data only while it is powered. Volatile

4. Motherboard

   • Connects all the components
   • Fan
     • Cools all the components that might get hot
   • Drive
     • Floppy drive
       • Reads and writes information stored on floppy discs Removable storage
     • Optical drive
       • Reads and writes information stored on compact discs
     • Hard disk drive
       • Permanent memory where most things are stored. Secondary storage Non-volatlle