Originally developed by Intel, PCI refers to a cross platform local bus technology integrated into modern motherboards.

PCI slots are used to connect a computer's internal components such as modems, sound-cards, network cards, etc.

There are 2 different implementations of PCI, one which is a 32-bit bus running at 33Mhz and the other (PCI 2.0) which is a 64-bit bus running at 66Mhz.

The development of the PCI bus specification is controlled by PCI-SIG whose board is made up of members of Adaptec, AMD, Hewlett-Packard, IBM, Intel, Microsoft, Phoenix Technologies and more.

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