EPOX An Intel Socket 478 Processor Based Mainboard (400/533MHz) Manual de usuario descargar pdf (Pagina 18)

However this can be a problem with the IRQ's because due to the legacy of the past

each and every mainboard of every manufacturer has only 16 IRQ's available but the

amount of possible devices that a system can have has increased beyond that.

Generally the following IRQ's are practically standard for mainboards:

IRQ 00 = System timer

IRQ 01 = Keyboard

IRQ 02 = I/O controller

IRQ 06 = Floppy Disk Controller

IRQ 08 = System Clock

IRQ 12 = PS/2 mouse

IRQ 13 = Numeric Data processor

IRQ 14 = IDE 1

IRQ 15 = IDE 2

That usually only leaves the IRQ's: 03, 04, 05, 07, 09, 10, 11.

Usually those are used for:

IRQ 03 = COM 1

IRQ 04 = COM 2

IRQ 05 = Soundcard

IRQ 07 = LPT/printer port

IRQ 09 = ACPI bus

IRQ 10 or 11 = Graphic card

That would leave only IRQ 10 or 11 for all the other devices you may wish to use like

for example USB, network card, SCSI, etc.... To solve that problem most recent

operating systems started using "IRQ-sharing" to handle that shortage but that

depends strongly on the component drivers and hardware design. Unfortunately in

practice when the sharing involves most graphic cards, sound cards, network cards or

USB controllers that usually causes a stability problem or devices do not function at

all.

So to solve the "IRQ sharing" problem that only leaves freeing up IRQ's by disabling

unused components like for examples the COM-ports, parallel/printer port in the

BIOS if there is nothing attached to them.

Some graphics cards do not necessarily need an IRQ and therefore it is also possible

to disable the assigning of the IRQ to the VGA cards. However some cards just need

an IRQ or they are unstable or do not even work at all. You would have to try that out

to discover what works or does not work with your card when it comes to the IRQ.

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EPOX An Intel Socket 478 Processor Based Mainboard (400/533MHz) Manual de usuario Pagina 18