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	IRQ - Interrupt ReQuest
		IRQ's 2 and 9 are ganged, as this is the way that the PC architecture was extended from the 8 bit 8 IRQ "PC/XT" bus to the 16 bit 286 "AT" bus.
		The IRQ is handled by the PIC, which then interrupts the processor, usually causing the processor to execute an Interrupt Service Routine (ISR).
		These IRQs are assigned and prioritized according to the importance of each device, so that the most important interrupt requests are handled first by the CPU.
	www.auditmypc.com /acronym/IRQ.asp (1120 words)

	PC Hell: Explanation of IRQ's, DMA's, and Conflicts
		IRQ's are hotlines to the main computer (CPU) that allow devices connected to the computer to signal the CPU that they need immediate attention.
		The most common IRQ conflicts seem to be between two COM ports, generally a mouse and modem conflict that ends up freezing the mouse whenever the modem is activated.
		This IRQ is assigned to a secondary printer port LPT2, but in the absence of a second printer port, it is used primarily for sound cards, or as an alternative IRQ for the COM ports.
	www.pchell.com /hardware/irqs.shtml (1317 words)

	PcMus, How to check and what are IRQ's ?
		IRQ steering, IRQ holders and ACPI IRQ STEERING functions are the exception to this.
		IRQ steering will follow the device around so dont worry about it if the device is sharing with IRQ steering or something similar.
		IRQ Sharing is the number 1 cause and is only the starting piont for stopping glitches/pops.
	www.pcmus.com /irq.htm (1248 words)

	A Guide to Adapters and I/O units.
		Physically, the IRQ is a wire on the bus.
		The more recent PC is "born" with 16 IRQs, but five of them are internal, and cannot be used with I/O cards, and one of them connects the lower IRQ's with the higher (IRQ2/9).
		When the IRQ is activated, the drive programs for the two adapters are checked, to identify which is on the bus.
	www.karbosguide.com /hardware/module5a3.htm (1302 words)

	IRQ
		An IRQ is an interrupt request, and is the name for the actual signal that is used when a peripheral requests an interrupt of the processor.
		This IRQ is used on most systems to drive the first parallel port, normally for the use of a printer.
		This is usually open and one of the easiest IRQs to use since it is generally not contested by many devices.
	networking.ringofsaturn.com /PC/IRQ.php (1134 words)

	Standard IRQ
		IRQ's allow equipment direct access to the processor, and their actions come under the command of the interrupt controller.
		IRQ conflicts occur when two or more devices attempt to use the same IRQ at the same time.
		As with IRQ's, DMA channel #4 is cascaded with the primary DMA controller in order to link the two controllers together.
	www.geocities.com /ferds3/standard_irq.htm (996 words)

	Resolving IRQ Conflicts on Windows Workstations
		An IRQ is an interrupt request that generates a signal to the PC's CPU through an interrupt controller chip.
		It is a general rule that IRQs cannot be shared when multiple devices that are assigned to the same IRQ are active simultaneously, except under special circumstances.
		Certain IRQs may appear twice, indicating that the IRQ is shared (this is where you'll want to start looking for shared interrupt conflicts).
	support.novell.com /techcenter/tips/ant19990501.html (1090 words)

	PC911 - Friendly Computer Help In Plain English
		The simplest way to understand IRQ's is to consider the IRQ as a doorbell when a device requires CPU attention, it places a signal on its assigned IRQ line.
		Most of the remaining IRQ lines of the secondary 8259A were then brought out to connections on the new 16-bit extension portion of the ISA expansion slot.
		This is due to the fact that they are connected to the first IRQ controller in place of the original IRQ2, and the entire second controller has therefore inherited the old IRQ2 priority position.
	www.pcnineoneone.com /howto/irq1.html (1650 words)

	What is an IRQ ? 8-bit Programmable Interrupt Controller IRQ
		An IRQ is a signal from a piece of hardware (such as a keyboard or sound card) indicating that it needs the CPU to do something.
		The INT signal (Interrupt--prioritized interrupt) of the second 8259 was connected to the old IRQ2 pin on the first 8259 and the IRQ 2 line was plugged into IRQ 9 on the new 8259.
		IRQs are prioritized and serviced in priority order by the CPU as determined by the controller.
	bugclub.org /beginners/windows/IRQ.html (347 words)

	IRQ Steering and Device Enumeration FAQ
		Reprograms IRQ 10 to be an ISA IRQ.
		IRQ steering is determined by one of four routing tables.
		The IRQ routing table that must be provided by the BIOS to the operating system may be missing or contain errors.
	members.bellatlantic.net /~mrscary/devenum.htm (1313 words)

	What is IRQ? - A Word Definition From the Webopedia Computer Dictionary (Site not responding. Last check: 2007-11-03)
		Abbreviation of interrupt request line, and pronounced I-R-Q. IRQs are hardware lines over which devices can send interrupt signals to the microprocessor.
		IRQ conflicts used to be a common problem when adding expansion boards, but the Plug-and-Play specification has removed this headache in most cases.
		Also see the list of IRQ numbers in the Quick Reference section of Webopedia.
	www.webopedia.com /TERM/I/IRQ.html (188 words)

	WaveWatcher Net-TV 98 IRQ Conflicts
		It is possible for you to have an IRQ that has three or more devices as well as three (or more) copies of the Holder for PCI Steering all assigned to the same IRQ.
		You may be able to juggle the IRQ’s in your system in other ways also (not determined because we don’t know the settings available to you) in order to resolve the IRQ conflict.
		If you cannot resolve the IRQ conflict on your own you may have to call the tech support line for the computer manufacture or seller to determine how to resolve this conflict within the system that you have.
	www.aitech.com /support/netirqconflict.htm (1643 words)

	Webopedia: IRQ Numbers
		Prior to plug-and-play devices, users had to set IRQ values of devices manually when adding the device, such as a modem or printer, to a system.
		The following list of IRQ numbers specifies what each of the 16 IRQ lines are used for.
		On systems that do not use IDE devices, the IRQ can be used for another purpose.
	www.webopedia.com /quick_ref/IRQnumbers.asp (378 words)

	Real World Technologies - IRQs Explained
		The IRQs that are usually available for add-on devices are IRQ 5, 7, 9, 10, 11 and 12.
		If you see a '!' (exclamation point) next to any IRQ number, this means that either the IRQ is in use by another device, or the Win95 driver which assigns this IRQ has not been loaded properly.
		With a little understanding of how IRQs work, and some judicious use of the techniques mentioned here, you should be able to overcome just about any IRQ problems you may encounter.
	www.realworldtech.com /page.cfm?ArticleID=RWT052498000000 (1613 words)

	General Description of IRQ Sharing in Windows 2000
		IRQ 9 is used by the PCI bus for IRQ steering.
		If you change to an invalid IRQ setting or I/O range for the bus that a device is on, Windows 2000 cannot rebalance the resource it assigned to that bus to compensate.
		Manually assigning IRQs to PCI slots in the System BIOS as a troubleshooting method may work on some non-ACPI systems when using a standard PC HAL, but these settings are ignored by Plug and Play in Windows if ACPI support is enabled.
	support.microsoft.com /?kbid=252420 (587 words)

	IRQ Conflict (Site not responding. Last check: 2007-11-03)
		That is no problem when the IRQ is available, but it is a problem if there is another device assigned to that IRQ.
		Some cards have the option of changing IRQ via jumpers, others will use a different IRQ depending on which PCI slot they are used in.
		For example, on some systems, the BIOS assigns IRQ 11 to the AccelPRO cards, but IRQ 11 is already assigned to the Adaptec 1542 ISA card by jumpers on that card.
	www.es.com /resources/realimage/error_messages/irq_conflict.htm (589 words)

	BBPC News \| BuildOrBuy - IRQ Map - I/O PIC & APIC
		These 16 IRQ lines are used to signal the CPU that a peripheral event has started or terminated.
		However, IRQ 2 is lost because it is used to connect to the second chip.
		IRQ 9 may be available for general use as most VGA cards do not require an IRQ.
	www.buildorbuy.org /irqmap.html (954 words)

	Tech Bits - IRQs and Windows 95/98/NT (Site not responding. Last check: 2007-11-03)
		The IRQ is a channel for the device to interrupt the CPU to tell it that it needs attention.
		The only reason you might have an IRQ conflict is if you have installed a new Device in your system, or if you are building a system from scratch.
		IRQ's 0-8 usually are for slower, older devices like 16 bit soundcards, 8 bit modems, etc. If you have a newer (32 bit PCI) device, try to assign it to IRQ's greater than 9.
	www.pgmusic.com /0507_2000.htm (1133 words)

	Computer System Resource Information
		Short for Interrupt request, IRQ is a signal that has a direct line to the computer processor, allowing it to stop the processor momentarily and decide what to do next.
		See IRQ Listing for a list of IRQs and which may be available or are currently used.
		However, generally it is a good idea to assign devices that you wish to move and do not plan to use to IRQ 9 to allow extra IRQs for a device you may plan to use.
	www.computerhope.com /irqs.htm (971 words)

	COM PORT & IRQ CONFLICTS
		You need to determine the IRQ and COM port is used by each serial interface card you may have installed.
		Each IRQ on the computer is assigned a "peripheral device" or other function (you can consult your computer documentation to see what these default settings are, or use MSD as explained above).
		COM port and IRQ settings are changed using switches located on the bracket of the modem.
	www.angelfire.com /ca/computertalk/comport.html (1523 words)

	Resolving IRQ/COM port conflicts
		IRQ and other hardware conflicts can manifest in many different ways.
		This is a duplication of the IRQ and therefore a conflict.
		As mentioned earlier, any software means of determining the IRQ setting of any piece of hardware with software may not be 100% reliable.
	service1.symantec.com /SUPPORT/pca.nsf/docid/1996112511055 (1452 words)

	WaveWatcher TV-PCI IRQ Conflicts
		It doesn't matter which IRQ the TV card and the Holder for PCI Steering are using, but they need to be the only two things listed on that IRQ.
		Windows may now assign another IRQ to this device and your system should be up and operating properly.
		If you still cannot resolve your IRQ conflict, you may wish to contact your PC manufacturer for more ideas, although they may be reluctant to help.
	www.aitech.com /support/irqconflict.htm (1581 words)

	Interrupt Request (IRQ) Conflicts (Site not responding. Last check: 2007-11-03)
		When two hardware devices are assigned to the same IRQ, one or both of the devices may decide not to function properly, or even to not function at all.
		If you still cannot determine what IRQs are shared, plug one card in and keep moving the card from slot to slot and restarting your machine until the device conflict is resolved or you run out of slots, whichever comes first.
		Manually Assigning IRQs in Windows XP If you are unable to resolve your IRQ conflict, you may need to assign IRQs manually.
	kadaitcha.cx /irq_conflicts.html (672 words)

	: What is IRQ sharing?
		The computer processor works on each IRQ for a slit second and then moves to the next.
		Ideally you would want every device to have it’s own IRQ, but this is not always possible.
		A computer may run fine with the DC10 sharing with a sound card, however, when you start a capture/output, both the sound card and the DC10 come to full speed, you then have a "large" device with a "medium" device, you may experience problems.
	www.pinnaclesys.com /support/faq/ViewFAQ.asp?id=1903 (422 words)

	RS232 I/O and IRQ's
		It honors new interrupts when the processor is busy processing another one, as long as the IRQ number of the new interrupt is lower than the currently occuring one.
		The IRQ 2 is a somewhat special case on AT class computers.
		The bit of IRQ 9 must also be cleared, which is not compatible with the original way of enabling the IRQ 2 on a XT computer.
	www.lammertbies.nl /comm/info/RS-232_io.html (1813 words)

	irq and com ports explained
		Alternate IRQs used for COM3 or COM4 include IRQ2, IRQ5, IRQ9, IRQ10, and IRQ11.
		If two devices are set to the same IRQ with a Micro Firmware Phoenix 4.03 or 4.05 BIOS upgrade installed, an error message should appear on bootup indicating what COM port is conflicting.
		and set the IRQ which is used by the legacy devices to ISA.
	members.tripod.com /pc_harddrive/hd_irq_com.htm (1557 words)

	Subject: IRQ Sleuth Guide
		While there are actually 15 IRQ channels, ONLY 4 of them can be assigned to the PCI bus - the slots where you plug your cards in.
		It assigns IRQs to various components, turns on or off features on the motherboard, controls voltages and clock speed to the processor, and a whole lot more.
		This MIGHT be enough to solve the problem, but if you shuffle cards and the IRQs change, or if all your PCI components are on the same IRQ, you're going to have to take control over BIOS.
	www.advent1.com /support/IRQguide.htm (1497 words)

	What is IRQ? - a definition from Whatis.com - see also: interrupt request
		An IRQ (interrupt request) value is an assigned location where the computer can expect a particular device to interrupt it when the device sends the computer signals about its operation.
		Prior to Plug-and Play (PnP) devices, users often had to set IRQ values manually (or be aware of them) when adding a new device to a computer.
		If you don't know what IRQ value to specify, you'll probably save time by calling the technical support phone number for the device manufacturer and asking.
	whatis.techtarget.com /definition/0,,sid9_gci214042,00.html (240 words)

	IRQ problems
		There are 16 IRQ lines used to signal the CPU that a peripheral event has started or terminated.
		If a new expansion card is preset to the IRQ used by an existing card, one of them must be changed, especially under 95/98/ME. Windows 2000/XP rarely has this problem, but then some motherboards seem to be fussy and will need help in this department even with Windows 2000/XP.
		The IRQ is often connected to one slot.
	www.titlevision.adsl.dk /tv2003/irq.htm (975 words)

	LWN: Patch: irq consolidation, new attempt (common part)
		Changes since previous patch: - irq_desc array removed from common irq code; - irq_dir, irq_affinity and smp_affinity_entry static NR_IRQS sized arrays replaced with corresponding entries in the irq_desc_t structure; - for_each_irq() arch specific macro introduced.
		Thus setups with different IRQ numbers + * shouldn't result in any weird surprises, and installing new handlers + * should be easier.
		+ / +void disable_irq(unsigned int irq) +{ + disable_irq_nosync(irq); + synchronize_irq(irq); +} + +/* + * enable_irq - enable handling of an irq + * @irq: Interrupt to enable + * + * Undoes the effect of one call to disable_irq().
	lwn.net /Articles/38380 (1421 words)

	Interrupt request - Wikipedia, the free encyclopedia
		In computing, an interrupt request (IRQ) is a phrase used to refer to either the act of interrupting, the bus lines used to signal an interrupt, or the interrupt input lines on a Programmable Interrupt Controller (PIC).
		Interrupt lines are often identified by an index with the format of IRQ followed by a number.
		IRQs 0 to 7 are managed by one Intel 8259 PIC, and IRQs 8 to 15 by a second Intel 8259 PIC.
	en.wikipedia.org /wiki/Interrupt_request (489 words)

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