Viglen Vig680M Manual page 26

 PCI Express Slot
IR Q, or interrupt request lines, are hardware lines over which devices can send interrupt
requests to the processor. The PCI IR Q pins are typically connected to the PCI bus pins
as followed:
Important
When adding or removing expansion cards, always turn off the power supply and unplug
the power supply power cable from the power outlet. Read the expansion card's
documentation to check for any necessary additional hardware or software changes.
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V1.0 Vig680M Motherboard Manual