XT bus architecture - meaning and definition. What is XT bus architecture
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What (who) is XT bus architecture - definition

16-BIT INTERNAL BUS OF IBM PC/AT
AT bus architecture; XT bus architecture; Industry standard architecture; ISA bus; PC-AT bus; AT Bus; ISA slot; XT interface; XT bus; AT bus; ISA card; Industry Standard(s) Architecture; ISA port; ISA backplane bus
  • 8-bit XT}}: Adlib FM Sound card
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  • 16-bit ISA}}: [[Ethernet]] 10Base-5/2 NIC
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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)
ISA bus         
AT bus architecture         

Wikipedia

Industry Standard Architecture

Industry Standard Architecture (ISA) is the 16-bit internal bus of IBM PC/AT and similar computers based on the Intel 80286 and its immediate successors during the 1980s. The bus was (largely) backward compatible with the 8-bit bus of the 8088-based IBM PC, including the IBM PC/XT as well as IBM PC compatibles.

Originally referred to as the PC bus (8-bit) or AT bus (16-bit), it was also termed I/O Channel by IBM. The ISA term was coined as a retronym by IBM PC clone manufacturers in the late 1980s or early 1990s as a reaction to IBM attempts to replace the AT-bus with its new and incompatible Micro Channel architecture.

The 16-bit ISA bus was also used with 32-bit processors for several years. An attempt to extend it to 32 bits, called Extended Industry Standard Architecture (EISA), was not very successful, however. Later buses such as VESA Local Bus and PCI were used instead, often along with ISA slots on the same mainboard. Derivatives of the AT bus structure were and still are used in ATA/IDE, the PCMCIA standard, CompactFlash, the PC/104 bus, and internally within Super I/O chips.

Even though ISA disappeared from consumer desktops many years ago, it is still used in industrial PCs, where certain specialized expansion cards that never transitioned to PCI and PCI Express are used.