Cnr (Communication Network Riser) Slot; Pci Interrupt Request Routing - MSI 845 Pro Manual

the power supply first. Meanwhile, read the documentation for the expansion
card to make any necessary hardware or software settings for the expansion
card, such as jumpers, switches or BIOS configuration.

CNR (Communication Network Riser) Slot

The CNR slot allows you to insert the CNR expansion cards. CNR is a
specially designed network, audio, or modem riser card for ATX family
motherboards. Its main processing is done through software and controlled
by the motherboard's chipset.

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 "AGP/PCI/USB/AC97" IRQ pins are typically connected
to the PCI bus INTA#-INTG# pins as follows:
AGP
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 B# INT C# INT D# INT A#
USB-1
USB-2
AC97
AGP & PCI Slot 1 shared.
USB-1 & PCI Slot 4 shared.
AC97 & PCI Slot 2 & PCI Slot 5 shared.
PCI Slot 1~5: Bus Master
Order 1 Order 2 Order 3 Order 4
INT A# INT B# INT C# INT D#
INT D#
INT H#
INT B#
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Hardware Setup