MSI 945GCM478 Series - PCI (Peripheral Component Interconnect) Express Slot; PCI Interrupt Request Routing

8
Important:
Note that the pins of VCC and GND must be connected correctly to avoid possible
damage.
Clear CMOS Jumper: JBAT1
There is a CMOS RAM onboard that has a power supply from
an external battery to keep the data of system configuration.
With the CMOS RAM, the system can automatically boot OS
every time it is turned on. If you want to clear the system
configuration, set the jumper to clear data.
Keep Data
Clear Data
2
2
2
1
1
1
3
3
3
Important:
You can clear CMOS by shorting 2-3 pin while the system is off. Then return to 1-2 pin
position. Avoid clearing the CMOS while the system is on; it will damage the mainboard.
PCI (Peripheral Component Interconnect) Express Slot
The PCI Express slot supports the PCI Express interface expansion card. The PCI
Express x 16 slot supports up to 4.0 GB/s transfer rate.
PCI (Peripheral Component Interconnect) Slot
The PCI slot supports LAN card, SCSI card, USB card, and other add-on cards that
comply with PCI specifications.
Important:
When adding or removing expansion cards, make sure that you unplug the power supply
first. Meanwhile, read the documentation for the expansion card to configure any
necessary hardware or software settings for the expansion card, such as jumpers,
switches or BIOS configuration.
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 A# INT B# INT C# INT D#
PCI Slot 2 INT B# INT C# INT D# INT A#
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