Asus P2B-N P2B-N User Manual - Page 31

Assigning DMA Channels for ISA Cards, ISA Cards and Hardware Monitor

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3. H/W SETUP Connectors 3. HARDWARE SETUP To simplify this process, this motherboard complies with the Plug and Play (PnP) specification, which was developed to allow automatic system configuration whenever a PnP-compliant card is added to the system. For PnP cards, IRQs are assigned automatically from those available. If the system has both Legacy and PnP ISA cards installed, IRQs are assigned to PnP cards from those not used by Legacy cards. The PCI and PnP configuration of the BIOS setup utility can be used to indicate which IRQs are being used by Legacy cards. For older Legacy cards that do not work with the BIOS, you can contact your vendor for an ISA Configuration Utility. An IRQ number is automatically assigned to PCI expansion cards after those used by Legacy and PnP ISA cards. In the PCI bus design, the BIOS automatically assigns an IRQ to PCI cards that require an IRQ. To install a PCI card, you need to set something called the INT (interrupt) assignment. Since all the PCI slots on this motherboard use an INTA #, be sure that the jumpers on your PCI cards are set to INT A. 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. You can select a DMA channel in the PCI and PnP configuration section of the BIOS Setup utility. IMPORTANT: To avoid conflicts, reserve the necessary IRQs and DMAs for legacy ISA cards (see 4.7 PNP and PCI Setup, 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 ISA Cards and Hardware Monitor The optional onboard hardware monitor uses the address 290H-297H, so legacy ISA cards must not use this address or else conflicts will occur. ASUS P2B-N User's Manual 31

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ASUS P2B-N User’s Manual
31
3. HARDWARE SETUP
Connectors
3. H/W SETUP
To simplify this process, this motherboard complies with the Plug and Play (PnP)
specification, which was developed to allow automatic system configuration when-
ever a PnP-compliant card is added to the system. For PnP cards, IRQs are assigned
automatically from those available.
If the system has both Legacy and PnP ISA cards installed, IRQs are
assigned to PnP cards from those not used by Legacy cards. The PCI and PnP con-
figuration of the BIOS setup utility can be used to indicate which IRQs are being
used by Legacy cards. For older Legacy cards that do not work with the BIOS, you
can contact your vendor for an ISA Configuration Utility.
An IRQ number is automatically assigned to PCI expansion cards after those used
by Legacy and PnP ISA cards. In the PCI bus design, the BIOS automatically as-
signs an IRQ to PCI cards that require an IRQ. To install a PCI card, you need to set
something called the INT (interrupt) assignment. Since all the PCI slots on this
motherboard use an INTA #, be sure that the jumpers on your PCI cards are set to
INT A.
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. You can select a DMA channel in
the PCI and PnP configuration section of the BIOS Setup utility.
IMPORTANT:
To avoid conflicts, reserve the necessary IRQs and DMAs for
legacy ISA cards (see
4.7 PNP and PCI Setup
, 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
ISA Cards and Hardware Monitor
The optional onboard hardware monitor uses the address 290H-297H, so legacy
ISA cards must not use this address or else conflicts will occur.