Asus P55SP4 - Manual (Page 24)

upgrade Guide
Any PCI expansion cards that need to use an IRQ have one au­
tomatically 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 in it that
requires an IRQ. To install 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 in­
stall is set to INT A.
Assigning DMA Channels For ISA 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 an ICU program, you can select a
DMA channel in the PCI and PNP Configuration section of the BIOS
Setup utility.
The MediaBus Slot
The PCM slot is both a standard PCI slot and, combined with its
slot extension, forms a proprietary MediaBus slot for ASUSTek
MediaBus expansion cards. The slot extension is an ISA extension that
allows combining of a PCI card and an 16-bit ISA card on one com­
posite card. Review the documentation for a particular card for an
explaination of how to install and set it up, including any IRQ use.
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