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34 ASUS P3W User’s Manual
3. HARDWARE SETUP
3.7.3 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 motherboard are handled the same way
as the IRQ assignment process described earlier. To select a DMA channel, see PCI/
PNP ISA DMA Resource Exclusion in 4.4.3 PCI Configuration. NOTE: The on-
board audio by default uses DMA1.
IMPORTANT: To avoid conflicts, reserve the necessary IRQs and DMAs for
legacy ISA cards (see PCI/PNP ISA IRQ Resource Exclusion and PCI/PNP
DMA IRQ Resource Exclusion in 4.4.3 PCI Configuration). Choose Yes in
IRQ xx Used By ISA and DMA x Used By ISA for those IRQs and DMAs you
want to reserve).
3.7.4 Audio Modem Riser (AMR) Slot
This connector supports a specially designed audio and/or modem card called an
AMR. Main processing is done through software and controlled by the motherboard’s
Intel I/O Controller Hub (ICH). This provides an upgradeable audio and/or modem
solution at an incredibly low cost. There are two types of AMR, one defined as
primary and another defined as secondary. This motherboard uses the primary chan-
nel so that a secondary AMR can coexist without the need to disable the onboard
CODEC. The motherboard’s onboard CODEC must be disabled when using a pri-
mary AMR.
NOTE: An AMR is not included with this motherboard.
10101
®
P3W
P3W Audio Modem Riser (AMR) Connector
Expansion Cards
3. H/W SETUP