Computer Science: Computer Hardware

Computer Science: Computer Hardware

1. Central Processing Unit

   • Fetch, Decode, Execute
   • Boot sequence
     • Contains all the information needed for the computer to get up and running
   • Cache memory
     • Memory space that can be accessed quicker than the RAM
   • Multiple processor cores
     • Data is processed quicker
     • Needs a more complicated operating system

2. Memory

   • RAM
     • Volatile
       • Data lost when turned off
     • Large
     • Stores programs being used by the computer
   • ROM
     • Non-Volatile
     • Small
     • Contains the boot sequence
   • Virtual Memory
     • Used when the computer doesn't have enough room in the RAM
     • Slower than the RAM
   • Flash Memory
     • ROM
     • Memory Stick
     • Memory Card

3. Binary Logic

4. Input and Output Devices

   • Input
     • Keyboard
     • Mouse
     • Touch Screen
     • Microphone
     • Camera
     • Bar Code Scanner
     • Sensor
     • Eye-typer
     • Foot Mouse
     • Puff and Suck switch
     • Braille keyboard
   • Output
     • Monitor
     • Printer
     • Plotter
     • Speakers

5. Secondary Storage

   • Magnetic Hard-disk
     • Relaible
     • High capacity
     • Low cost
   • Optical Disk
     • Good Capacity
     • Low cost
     • light weight and prtable
   • Flash memory
     • Good capacity
     • More expensive than hard disk

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