Pci Interrupt Request Routing - MSI 651M-V Instruction Manual

faster than USB 1.1, and is ideal for connecting high-speed USB interface peripherals such as USB
HDD, digital cameras, MP3 players, printers, modems and the like.
Clear CMOS Jumper: JBAT1
There is a CMOS RAM on board that has a power supply from 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, use the
JBAT1 (Clear CMOS Jumper ) to clear data. Follow the instructions to clear the data:
MSI Reminds You...
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.
AGP (Accelerated Graphics Port) Slot
The AGP slot allows you to insert the AGP graphics card. AGP is an interface specification designed for
the throughput demands of 3D graphics. It introduces a 66MHz, 32-bit channel for the graphics
controller to directly access main memory. The slot supports 8x/4x AGP card.
PCI (Peripheral Component Interconnect) Slots
The PCI slots allow you to insert the expansion cards to meet your needs. When adding or removing
expansion cards, make sure that you unplug 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.

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 PCI IRQ pins are typically connected to
the PCI bus INT A# ~ INT D# pins as follows:
Order1
PCI Slot 1 INT B#
PCI Slot 2 INT C#
PCI Slot 3 INT D#
Order2 Order3
INT C# INT D#
INT D# INT A#
INT A# INT B#
9
1
1
3
Kee p Dat a
Order4
INT A#
INT B#
INT C#
1
3
Cle ar D ata