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The XT bus has four DMA channels, of which three are brought out to the expansion slots. Of these three, two are normally allocated to machine functions:

See also

• Extended Industry Standard Architecture
• Industry Standard Architecture
• Micro Channel Architecture
• Peripheral Component InterconnectFor other meanings of PCI see PCI (disambiguation). motherboard The Peripheral Component Interconnect standard (in practice almost always shortened to PCI specifies a computer bus for attaching peripheral devices to a computer motherboard. These devices c

Article based on XT bus architecture at FOLDOC, used with permission.