Multi-point Bus - physically connects multiple devices.
  
  Addressing - broadcast to each device, requiring additional decoding
    or selection at device or port interface.
  
  Bi-directional data movement.
  
  Generic controls for unknown devices.
    Timing, handshaking, data direction.
  
  Common buses.
    XT, AT bus. Internal.
    


    PCI bus. Internal.
    
  
    Parallel ATA - hard drive/Optical drive interface. Internal.
      Only allowed 2 devices on a single interface.  
        Jumpers on device or twist in cabling IDed/targeted device. 

    IEEE-488 GPIB. External.