MSI P67A-C45 series User Manual page 40

Hardware Setup
PCI (Perpheral Component Interconnect) Slot
The PCI slot supports LAN card, SCSI card, USB card, and other add-on cards that
comply wth PCI specficatons.
Important
When addng or removng expanson cards, make sure that you unplug the power sup-
ply first. Meanwhle, read the documentaton for the expanson card to configure any
necessary hardware or software settngs for the expanson card, such as jumpers,
swtches or BIOS configuraton.
PCI Interrupt Request Routng
IRQ, or nterrupt request lne, are hardware lnes over whch devces can send nterrupt
sgnals to the mcroprocessor. The PCI IRQ pns are typcally connected to the PCI bus
pns as follows:
PCI Slot1
PCI Slot2
PCI Slot3
2-24
Order1 Order2 Order3
INT A# INT B# INT C#
INT B# INT C# INT D#
INT C# INT D# INT A#
32-bt PCI Slot
Order4
INT D#
INT A#
INT B#