Asus P4B266 - Manual (Page 92)

4-24 Chapter 4: BIOS Setup
IRQ XX Reserved [No/ICU]
These fields indicate whether or not the displayed IRQ for each field is
being used by a legacy (non-PnP) ISA card. The setting [No/ICU] for an
IRQ field indicates that you are using the ISA Configuration Utility (ICU),
and that this particular IRQ is NOT required by a legacy ISA card. Set the
IRQ field to [Yes] if you install a legacy ISA card that requires a unique IRQ
and you are NOT using ICU. Configuration options: [No/ICU] [Yes]
4.4.3.1 PCI IRQ Resource Exclusion
Primary VGA BIOS [PCI VGA Card]
This field allows you to select the primary graphics card. Configuration
options: [PCI VGA Card] [AGP VGA Card]
Onboard LAN Boot ROM [Disabled]
This field allows you to enable or disable the option ROM in the onboard
LAN chipset. Configuration options: [Disabled] [Enabled]