MSI K7T266 User Guide - Page 52

Hardware Setup 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. To install a PCI expansion card on a PCI shared slot, you must make sure the card's driver supports "IRQ shared" function or there is no need to assign an IRQ to the device. The "AGP/PCI/USB/Promise ATA100" IRQ pins are typically connected to the PCI bus INTA#-INTD# pins as follows: Order 1 Order 2 Order 3 Order 4 AGP INT A# INT B# PCI Slot 1 INT A# INT B# INT C# INT D# PCI Slot 2 INT B# INT C# INT D# INT A# PCI Slot 3 INT C# INT D# INT A# INT B# PCI Slot 4 INT D# INT A# INT B# INT C# PCI Slot 5 INT A# INT B# INT C# INT D# NEC USB 2.0 INT A# INT B# INT C# Promise ATA 100 INT B# The mainboard supports PCI Slot 1~5 Bus Master. 2-31