MSI P43 - Manual (Page 37)

2-21
Hardware Setup
PCI Interrupt Request Routing
The IRQ, acronym 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 pins as follows:
Order 1 Order 2 Order 3 Order 4
PCI Slot 1 INT F# INT G# INT H# INT E#
PCI Slot 2 INT G# INT H# INT E# INT F#
PCI Slot 3 INT A# INT B# INT C# INT D#