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Chapter 2
2-30
PCI Interrupt Request Routing
The IRQ, abbreviation of interrupt request line and pronounced I-R-Q,
are hardware lines over which devices can send interrupt signals to the
microprocessor. The PCI IRQ pins are typically connected to the PCI bus as
follows:
Order 1 Order 2 Order 3 Order 4
PCI Slot 1 INT C# INT F# INT G# INT A#
PCI Slot 2 INT F# INT G# INT A# INT C#
PCI Slot 3 INT G# INT A# INT C# INT F#
PCI Slot 4 INT A# INT C# INT F# INT G#