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Topic: XT bus architecture

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	Industry Standard Architecture - Wikipedia, the free encyclopedia
		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.
		The XT bus has four DMA channels, of which three are brought out to the expansion slots.
		The PC/104 bus, used in industrial and embedded applications, is a derivative of the ISA bus, utilizing the same signal lines with different connectors.
	en.wikipedia.org /wiki/XT_bus_architecture (677 words)

	PC bus systems
		Bus masters are devices capable of initiating any bus cycle (memory read/write, port addressing, etc.) and bus slaves are devices which are not capable of initiating a bus cycle but merely responding to it.
		The bus mastering was not a complete or perfect implementation due to certain limitations such as a request by a Bus master for 'Bus hand-off' requiring several cycles for completion and the master having to relinquish the bus periodically to allow memory refresh (or do the refresh itself).
		These bus systems have evolved from "one PC one bus" architectures which were prevalent in the early PCs to systems today which are built around a number of different buses, each of which is used for particular features it offers e.g.
	www.csn.ul.ie /~stephen/buses.html (7161 words)

	Extended Industry Standard Architecture : EISA
		The Extended Industry Standard Architecture (in practice almost always shortened to EISA) is a bus standard for IBM compatibles that extends the ISA bus architecture to 32 bits and allows more than one CPU to share the bus.
		The bus mastering support is also enhanced to provide access to 4 GB of memory.
		EISA was announced in late 1988 by compatible vendors as a counter to IBM's MCA in its PS/2 series.
	www.fastload.org /ei/EISA.html (155 words)

	IBM PC (Site not responding. Last check: 2007-10-22)
		The models of its second generation, the IBM Personal System/2 (PS/2), are known by model number: Model 25, Model 30.
		The VESA Local Bus allowed for a single, much faster 32-bit card slot for display cards, and the EISA architecture was developed as a backward compatible standard including 32-bit card slots, but it only sold well in high-end server systems.
		The lower-cost and more general PCI bus was introduced in 1994 and has now become ubiquitous.
	www.worldhistory.com /wiki/I/IBM-PC.htm (2118 words)

	At
		Second they decided on an open architecture so that other manufacturers could produce and sell compatible machines - the IBM PC compatibles, so the specification of the ROM BIOS was published.
		The PC XT was an enhanced machine designed for business use.
		The AT architecture was an ad hoc standard, and while the power supplies and motherboards that fit in one AT case usually fit another, the specifications were not universal and there were sometimes physical incompatibilities.
	www.websters-online-dictionary.com /definition/english/at/at.html (5847 words)

	xt bus architecture - BlueRider.com
		(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.
		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
	xt_bus_architecture.bluerider.com /wordsearch/xt_bus_architecture (93 words)

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