Asus P4SE/U2 - Manual (Page 48)

2-20 Chapter 2: BIOS Information
2.5 Power Menu
The Power menu allows you to reduce power consumption. This feature turns off
the video display and shuts down the hard disk after a period of inactivity.
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]
2.4.3.2 PCI IRQ Resource Exclusion