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28 ASUS P3B-1394 User’s Manual
3. HARDWARE SETUP
DMA Channels
3. H/W SETUP
P3B-1394 Accelerated Graphics Port (AGP)
P3B-1394
®
Manager tab. Double-clicking on a specific hardware device gives you the Re-
sources tab which shows the Interrupt number and address. Make sure that no two
devices use the same IRQ or your computer will experience problems when those
two devices are in use at the same time.
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 Accelerated Graphics Port (AGP)
This motherboard provides an accelerated graphics port (AGP) slot to support a new
generation of graphics cards with ultra-high memory bandwidth, such as an ASUS
3D Hardware Accelerator.