Asus P/I-P55T2P4S - Manual (Page 48)

ASUS P/I-P55T2P4S User's Manual 42
IV. BIOS SOFTWARE
(Plug & Play / PCI)
IV
. BIOS
PNP and PCI Setup
This “PNP and PCI Setup” option configures the PCI bus slots. All PCI bus slots on
the system use INTA#, thus all installed PCI cards must be set to this value.
The first four fields on the screen set how IRQ use is determined for each PCI slot.
The default setting for each field is Auto, which uses auto-routing to determine IRQ
use. The other options are manual settings of 14 or 15 for each slot.
PCI Latency Timer
The default setting of “32 PCI Clock” enables maximum PCI performance for this
motherboard.
IRQ xx Used By ISA
These fields indicate whether or not the displayed IRQ for each field is being used
by a Legacy (non-PnP) ISA card. Two options are available: No/ICU and Yes. The
first option, the default value, indicates either that the displayed IRQ is not used or
an ISA Configuration Utility (ICU) is being used to determine if an ISA card is
using that IRQ. If you install a Legacy ISA card that requires a unique IRQ, and you
are not using an ICU, you must set the field for that IRQ to Yes. For example: If you
install a Legacy ISA card that requires IRQ 10, then set IRQ10 Used By ISA to Yes.
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DMA x Used By ISA
These fields indicate whether or not the displayed DMA channel for each field is
being used by a Legacy (non-PnP) ISA card. Available options include: No/ICU
and Yes. The first option, the default setting, indicates either that the displayed
DMA channel is not used or an ICU is being used to determine if an ISA card is
using that channel. If you install a Legacy ISA card that requires a unique DMA
channel, and you are not using an ICU, you must set the field for that channel to Yes.