XT bus architecture
<hardware, architecture> (After the IBM PC XT) 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 the Intel 80286
based machines.
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 disc} controller
(1997-09-15)
Nearby terms:
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