Asus P2B - Manual (Page 50)

50 ASUS P2B User’s Manual
IV. BIOS SETUP
Plug & Play / PCI
IV
. BIOS
PNP and PCI Setup
The “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.
NOTE: SETUP Defaults are noted in parenthesis next to each function heading.
Details of PNP and PCI Setup
PNP OS Installed (No)
This field allows you to use a Plug-and-Play (PnP) operating system to configure the
PCI bus slots instead of using the BIOS. Thus interrupts may be reassigned by the OS
when Yes is selected. When a non-PnP OS is installed or to prevent reassigning of
interrupt settings, select the default setting of No.
Slot 1/2/3/4/5 IRQ (Auto)
These fields 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 NA, 3, 4, 5, 7, 9, 10, 11, 12, 14, or 15 for each slot.
PCI Latency Timer (32 PCI Clock)
The default setting of 32 PCI Clock enables maximum PCI performance for this moth-
erboard.
IRQ xx Used By ISA (No/ICU)
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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