Asus P I-P55SP3AV P/I-P55SP3AV User's manual - Page 22

Upgrade Guide Any PCI expansion cards that need to use an IRQ have one automatically assigned from the IRQs remaining after Legacy and PNP ISA cards have had theirs assigned. In the PCI bus design, the BIOS automatically assigns an IRQ to a PCI slot that has a card installed which requires an IRQ. When installing a PCI card, you need to set something called the "INT" assignment. Since all the PCI slots on this mainboard use "INTA#", you only need to make sure that any PCI card you install is set to INT A. AssigningDMA ChannelsForISA Cards Some ISA cards, both Legacy and PNP may also need to use a DMA (Direct Memory Access) channel. DMA assignments for this mainboard are handled the same way as the IRQ assignment process described above. If you don't use art ICU program, you can select a DMA channel in the "PCI/PNP & Onboard I/O Setup" section of the BIOS Setup utility. 2 - 5