PCI - Peripheral Component Interconnect
  1993 Intel 

  Separate from the local memory bus.

  Uses independent interface chips 
    Can be used in non-8086 systems.

  Intel holds patent o interface chips. 
    Protocol licensed for free, but chips must be bought.

  32-bit bus 33 MHz 

  Chip set provides bus mastering (arbitration).
    Burst mode - takes over sequential addressing of a block of data.
      
  Modified higher speed version seen in the AGP protocol.

  Has its own interrupt handling which it projects on to the systems
    interrupt handling. 
 
  Tends to be limited to 4-6 interface slots.

  Some protocols such as serial connection is not handled by PCI but 
    by the older ISA protocol and interface.

  PCI allows up to four IDE interfaces.

  PCI provides enough bus mastering to allow for DMA.