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Topic: VESA Local Bus

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VLB

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Extended Industry Standard Architecture

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	VESA Card Size, VESA PinOut, VESA Local Bus, VLB
		The VLB was released in 1992 and operated as a PC Local Bus Expansion.
		However, VESA Local Bus board may be found in legacy equipment.
		The PCAT bus [ISA] was an up-grade to the original PCXT bus, and the VLB bus was an up-grade to the PC-AT bus.
	www.interfacebus.com /VESA_Local_Bus_Pinout.html (474 words)

	Please title this page. (Page 3)
		The first VESA devices were video controllers, and they were placed on a VESA A local bus which was connected directly to the host CPU bus.
		The interface between the CPU bus and the VESA A bus must be CPU dependent - the controller that communicates between the CPU and the host bus speaks only to the particular family of CPUs it was designed for (486, 386, etc.).
		VESA A was a good idea and an excellent effort but it was not flexible enough to survive, and it was very inefficient with regards to CPU usage.
	www.ece.unh.edu /courses/ece707_4/vesa.html (589 words)

	Computer bus
		The former referred to bus systems that were designed to be used with internal devices, such as graphics cards, and the later to buses designed to add external devices such as scanners.
		An internal bus connects all the internal components of a computer to the motherboard (and thus, the CPU and internal memory).
		These types of buses are also referred to as a local bus, because they are intended to connect to local devices, not to those in other machines or external to the computer.
	www.ebroadcast.com.au /lookup/encyclopedia/da/Databus.html (1319 words)

	bus (Site not responding. Last check: 2007-10-09)
		The Bus is a roadway, circuit, on which electronic impulses travel throughout the computer.
		It is called a bus because "loads" or "bits" of data from one component to the main board is transferred to another component.
		The bus was commonly mistaken for the motherboard of computers.
	library.thinkquest.org /11309/data/bus.htm (271 words)

	I/O buses: ISA,MCA,EISA,VESA Local bus, PCI Local bus
		VESA (Video Electronics Standards Association Local Bus) Local Bus is a standard interface between your computer and its expansion slots that provides faster data flow between the devices controlled by the expansion cards and your computer's microprocessor.
		Because of the way the system bus is designed, it is not feasible for more than one device to use an interrupt at one time, because this can confuse the processor and cause it to respond to the wrong device at the wrong time.
		A Local Bus video card can transfer four bytes of data at a time, and it can operate at the 25 or 33Mh clock rate of the CPU and memory instead of the slower clock rate of the I/O bus.
	europa.nvc.cs.vt.edu /~cegyhazy/cs4014/Chapt4.htm (10561 words)

	VESA Local Bus - Wikipedia, the free encyclopedia
		VESA Local Bus worked alongside the ISA bus; it acted as a high-speed conduit for memory-mapped I/O and DMA, while the ISA bus handled interrupts and port-mapped I/O.
		Indeed, both VLB and ISA cards could be plugged into a VLB slot (although not at the same time.) The extended portion was usually coloured a distinctive brown.
		The VESA Local Bus relied heavily on the 80486's memory bus design.
	en.wikipedia.org /wiki/VESA_Local_Bus (635 words)

	VLB - Vesa Local Bus
		VLB is a 32-bit bus, which runs at speeds between 25 and 50 MHz.
		Stands for "VESA Local Bus." (VESA stands for "Video Electronics Standards Association.") The VLB, or VL-bus is a hardware interface on the computer's motherboard that is attached to an expansion slot.
		Though the VLB architecture was popular in the early 1990s, it has since been replaced by the newer and faster, but still three-lettered, ISA and PCI slots.
	www.auditmypc.com /acronym/VLB.asp (241 words)

	[No title]
		VESA LOCAL BUS (VLB) This file is intended to provide a basic functional overview of the Vesa Local Bus, so that hobbyists and ametuers can design their own VLB compatible cards.
		VLB Connectors are usually inline with ISA connectors, so that adapter cards may use both.
		However, the VLB is seperate, and does not need to connect to the ISA portion of the bus.
	www.xs4all.nl /~ganswijk/chipdir/oth/sokos/vlb.txt (462 words)

	What is VESA Local Bus? - a definition from Whatis.com - see also: VESA
		VESA Local Bus (sometimes called the VESA VL bus) is a standard interface between your computer and its expansion slot that provides faster data flow between the devices controlled by the expansion cards and your computer's microprocessor.
		A "local bus" is a physical path on which data flows at almost the speed of the microprocessor, increasing total system performance.
		A VESA Local Bus is implemented by adding a supplemental slot and card that aligns with and augments an Industry Standard Architecture expansion card.
	whatis.techtarget.com /definition/0,,sid9_gci213287,00.html (173 words)

	Please title this page. (Page 4)
		VLB was widely used on 486 motherboards, where the system bus runs at 33 MHz.
		However, the VLB is separate, and does not need to connect to the ISA portion of the bus.
		Local Device: When appropriate address and M/IO signals are present on the bus, the VLB device must pull this line low to indicate that it is a VLB device.
	www.ece.unh.edu /courses/ece707_4/vlb.html (356 words)

	The I/O Bus
		So a "faster" bus is not one where the electrons move faster, but rather one in which the time between meaningful events (the "clock speed") is faster.
		The ISA bus interface is simple and cheap, but it requires the user to set the IRQ, either with physical switches on the card or through some kind of setup configuration utility.
		When the device is ready for more data, it uses one bus cycle to send a request to the DMA chip, the chip then substitutes for the CPU in generating the next buffer address to the memory circuits to fetch the next chunk of data for the device.
	sophia.dtp.fmph.uniba.sk /pchardware/bus.html (3749 words)

	Information and help with the computer bus
		A computer bus is a method of transmitting data from one part of the computer to another part of the computer.
		The VLB is a 32-bit bus that had direct access to the system memory at the speed of the processor, commonly the 486 CPU (33 / 40 MHz).
		VLB 2.0 was later released in 1994 and had a 64-bit bus and a bus speed of 50 MHz.
	www.computerhope.com /help/bus.htm (1133 words)

	Mastering A+ Certification: Core Hardware Domain 4.3
		Recall that a bus is nothing more than a group of conductors treated as a unit; as a data bus, it is a group of conductors used to carry data.
		In essence, the PCI bus is not strictly a local bus, since connections to the PCI bus are not connections to the processor, but rather a special PCI-to-host controller chip.
		Local bus video cards and hard drive controllers are popular because of their high-speed data transfer capability.
	www.sunybroome.edu /~antonakos_j/aplus/hw43.htm (1772 words)

	What is VL-Bus or VESA local bus? - Knowledge Base
		The VLB is an older local bus architecture popular on 486 computer systems in 1993 and 1994.
		The VLB is not a replacement for the expansion bus, but is instead an addition to it.
		The VLB was widely used on 486 motherboards, providing a wider bandwidth for peripheral data transfer than the traditional ISA bus.
	kb.iu.edu /data/ahxb.html (409 words)

	AT bus - Webopedia.com
		The bus, therefore, is the main highway for all data moving in and out of the computer.
		The AT bus, which runs at 8 megahertz and has a 16-bit data path, is the de facto standard for PCs.
		The most common solution to bypassing the AT-bus bottleneck is to include a local bus on the motherboard.
	systems.webopedia.com /TERM/A/AT_bus.html (344 words)

	VESA LocalBus (VLB) ðàñïèíîâêà @ pinouts.ru
		VESA had several flaws that served to limit its useful life substantially: 80486 dependence.
		When the Pentium processor started to gain mass acceptance, circa 1995, there were major differences in its bus design, and the VESA bus was not easily adaptable.
		This was because, as a direct branch of the 80486 memory bus, the VESA Local Bus didn"t have the electrical ability to drive more than 1 or 2 (or 3 at the most) cards at a time.
	pinouts.ru /Slots/VLB.shtml (699 words)

	Linux PCI-HOWTO - Linux Howto
		VESA busses are tied directly to the speed of the memory bus for 486's, or half the speed for Pentiums.
		Unlike some local buses, which are aimed at speeding up graphics alone, the PCI Local Bus is a total system solution, providing increased performance for networks, disk drives, full-motion video, graphics and the full range of high-speed peripherals.
		Because it is processor-independent, the PCI Local Bus is optimized for I/O functions, enabling the local bus to operate concurrent with the processor/memory subsystem.
	www.icewalkers.com /Linux/Howto/PCI-HOWTO-2.html (2238 words)

	VESA Local Bus - Wikipedia (Site not responding. Last check: 2007-10-09)
		The VESA Local Bus is a local bus defined by the Video Electronics Standards Association, mostly used in personal computers based on the Intel 80486 CPU.
		The VESA Local Bus was technically inferior to the Peripheral Component Interconnect (PCI) architecture, and thus was not widely used.
		Article based based on VESA Local Bus (http://foldoc.doc.ic.ac.uk/foldoc/foldoc.cgi?Vesa+local+bus) at FOLDOC (http://www.foldoc.org), used with permission.
	wikipedia.findthelinks.com /vl/VLB.html (69 words)

	Technical Reference Infobase: VESA (Site not responding. Last check: 2007-10-09)
		The VESA Local Bus, or VLB, is a local bus system that is capable of 32-bit data transfer, running at whatever clock speed is input into the processor.
		The VLB allows peripherals direct access to the CPU by passing by the memory bus and system controllers.
		At the moment, the VLB is more widely supported than the PCI, but the PCI is quickly becoming the preferred local bus system.
	www.modems.com /glossary/glos19.html (69 words)

	ISA, VESA, PCI and USB - PC ComputerNotes
		It had a bus speed of 8 MHz and was capable of using 1 bus-mastering device.
		Near the end of the 486's reign, the PCI bus was introduced and adopted.
		A local bus connects directly to the processor and operates at the same speed as the CPU externally (not multiplied).
	www.pccomputernotes.com /system_bus/bus05.htm (1464 words)

	What is a local bus? - Knowledge Base
		A local bus is a data bus (the circuits that transport data within the computer) that connects directly, or almost directly, to the CPU.
		The first local bus was the VESA local bus.
		Current PCs have a PCI and an AGP local bus and an ISA expansion bus for older and slower devices.
	kb.iu.edu /data/ahvz.html (138 words)

	The Computer Bus
		The bus is actually a set of circuits that run throughout the board and connect all the expansion slots, memory, and CPU, etc. together.
		We use red light (lets say a VESA Local Bus controller) to allow the slower traffic from the city street to enter the higher speed roadway (system bus).
		Since the ISA bus is a max of 8mbps, it cannot keep the system bus fully occupied.
	www.footefamily.org /train/buses.htm (761 words)

	PC Buses
		Multiple devices connect to the bus and a signal transmitted by 1 device is available for reception by all other devices attached to the bus.
		The PCI bus is actually an intermediate between the CPU local bus and a standard expansion bus.
		Between the Local bus and expansion bus is a PCI bridge/controller.
	www.spiceisle.com /george-er/PCBuses.html (844 words)

	[No title]
		VESA local bus designs also used a burst technique, but a burst session could be inopportunely interrupted by another expansion device.
		While the PCI design employs local bus architecture, and is therefore closer to the CPU and host bus, it does not directly use IRQ's to interrupt the CPU as other architectures did: INT lines and IRQs are two different entities.
		The SERR# signal is used by the PCI bus and devices to report to the PCI BIOS that an error has been encountered, and is one of the signals that the bridge is designed to respond to.
	www.bychoice.com /PCI_Bus_Overview.doc (3911 words)

	Motherboard Bus Slots
		The VESA (Video Electronics Standard Association) local bus, also known as the VL-bus, was debuted in August 1992 and was popular until 1994.
		It was called a local bus because the bus was running at the speed of the processor instead of 8.33MHz like its predecessors.
		This 32-bit bus was originally developed by NEC who wanted something to decrease the bottleneck of the video in the bus.
	home.fuse.net /Walts_Place/motherboardslots.htm (1234 words)

	VESA Local Bus
		VLB cards can be easily identified by their longer connectors, compared to standard ISA card slots.
		This is primarily due to the fact that the 32-bit local bus used by VLB cards allows for several times more data throughput between the card and the processor than ISA allows.
		Many VLB cards are very good performers, but are hampered by their general age, along with that of the motherboards they run in; most are at least four years old and new development of better and faster chipsets is entirely in the PCI world now.
	www.pcguide.com /ref/video/ifVLB-c.html (384 words)

	VLB.HTM (Site not responding. Last check: 2007-10-09)
		Vesa Local Bus isolation extender, wearout extender, offset extender and regular extender.
		VLBIX is a Bus Isolation Extender for the Vesa Local Bus (VLB).
		It allows 32 and 64 bit VLB adapter boards to be added or removed from the Vesa system bus without having to power down the system.
	www.adexelec.com /vlb.htm (398 words)

	VESA LocalBus (VLB) pinout and signals @ pinouts.ru
		VESA Local Bus worked alongside the ISA bus; it acted as a high-speed conduit for memory-mapped I/O and DMA, while the ISA bus handled interrupts and port-mapped I/O. The VESA Local Bus was designed as a stop-gap solution to the problem of the ISA bus"s limited bandwidth.
		Few Pentium motherboards with VESA slots were ever made.
		Efforts have been made to ensure this page is correct, but it is the responsibility of the user to verify the data is correct for their application.
	pinouts.ru /Slots/VLB_pinout.shtml (780 words)

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