4.4.3.2 PCI IRQ Resource Exclusion

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) 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 card. Set the IRQ field to [Yes] if you install a legacy card that requires a unique IRQ and you are NOT using ICU. Configuration options: [No/ICU] [Yes]

ASUS P4B266-M motherboard user guide

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