Asus P2Z-B User Manual download pdf (Page 27)

ASUS P2Z-B User’s Manual 27

III. HARDWARE SETUP

To simplify this process this motherboard has complied 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 as-

signed 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 as-

signs 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 (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.

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 (under PNP AND PCI Setup of BIOS SETUP, choose Yes in IRQ xx Used By

ISA and DMA x Used By ISA for those IRQs and DMAs you want to reserve).

ISA Cards and Hardware Monitor

The onboard hardware monitor uses the address 290H-297H so legacy ISA cards

must not use this address or else conflicts will occur.

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.

P2Z-B Accelerated Graphics Port (AGP)

P2Z-B

DMA Channels

III. H/W SETUP

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Asus P2Z-B User Manual Page 27