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XT bus architecture
The XT bus architecture is an eight-bit ISA bus architecture used by Intel 8086 and Intel 8088 systems in the IBM PC and IBM PC XT in the 1980s. It predates the 16-bit ISA architecture used on IBM PC AT machines.
Article based on XT bus architecture (http://foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?query=xt+bus+architecture) at FOLDOC (http://www.foldoc.org), used with permission.
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:
| DMA channel | Expansion | Standard function |
|---|---|---|
| 0 | No | {dynamic RAM} refresh |
| 1 | Yes | add-on cards |
| 2 | Yes | {floppy disk} controller |
| 3 | Yes | {hard disk} controller |
- Extended Industry Standard Architecture
- Industry Standard Architecture
- Micro Channel Architecture
- Peripheral Component Interconnect
Article based on XT bus architecture (http://foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?query=xt+bus+architecture) at FOLDOC (http://www.foldoc.org), used with permission.
All Wikipedia text is available under the terms of the GNU Free Documentation License
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