Pci (Peripheral Component Interconnect) Slots; Pci Interrupt Request Routing - MSI 945GZM3 Series User Manual

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PCI (Peripheral Component Interconnect) Slots

The PCI slots support LAN cards, SCSI cards, USB cards, and other add-on cards
that comply with PCI specifications. At 32 bits and 33 MHz, it yields a throughput rate
of 133 MBps.
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:
PCI Slot 1
PCI Slot 2
PCI Slot 3
2-22
Order 1 Order 2
INT A# INT B#
INT B# INT C#
INT C# INT D#
32-bit PCI Slot
Order 3 Order 4
INT C# INT D#
INT D# INT A#
INT A# INT B#