1.1 System Architecture

1.1 System Architecture

1. Internal Components

   • Buses
     • Data Bus
       • Bi- directional
       • data can be read
       • data can be written
       • Carries out instructions from secondary storage to the processor
     • A bus is a set of two or more independant parts of a computer system in order to pass signals between them
     • Address Bus
       • Carries memory locations from the processor to I/O Devices
       • Uni-directional
       • All data/ instructions return via the DATA BUS
       • The processor generates adress
     • Control Bus
       • examples
         • Memory read
         • Memory Write
       • Control signals go via this
       • Instructs data will be travelling to and from memory

2. External Components

   • Mouse
   • Keyboard
   • printer
   • Secondary storage
     • CD-R
     • Floppy disk
     • DVD-R
     • USB drive
   • AKA Peripherals
   • I/O devices and ports