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1st / 2nd / 3rd / 4th Available PCI Interrupt
The PCI bus uses its own internal interrupts, usually numbered #1 to #4 or #A to #D. Some PCI cards need to be able to use one of the regular system IRQs (interrupt request lines) to communicate with the processor. This setting "maps" the PCI interrupts to regular system IRQs by telling the BIOS which regular interrupt line to use for PCI cards that need one. The usual choices for this are IRQ9, IRQ10, IRQ11 and IRQ12.
Note: If automatic
resource allocation is enabled, these options will normally either be locked to prevent
change, or even cleared from the screen altogether, since the BIOS will control them
Next: PCI VGA Palette Snoop