Asus P2B P2B User Manual - Page 50

IV. BIOS SETUP 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. IV. BIOS Plug & Play / PCI 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 motherboard. 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... 50 ASUS P2B User's Manual