MSI P4m900m3l Manual

MS-7255 Mainboard
2-16JCD1GNDR LAux Line-In Connector: JCD1
The connector is for DVD add-on card with Line-in connector.
PINSIGNALDESCRIPTION
1HD_LED +Hard disk LED pull-up
2FP PWR/SLPMSG LED pull-up
3HD_LED -Hard disk active LED
4FP PWR/SLPMSG LED pull-up
5RST_SW -Reset Switch low reference pull-down to GND
6PWR_SW +Power Switch high reference pull-up
7RST_SW +Reset Switch high reference pull-up
8PWR_SW -Power Switch low reference pull-down to GND
9RSVD_DNUReserved. Do not use. JFP1 Pin DefinitionFront...

2-17 Hardware Setup
Front Panel Audio Connector: JAUD1
The JAUD1 front panel audio connector allows you to connect the front panel audio
and is compliant with Intel®
 Front Panel I/O Connectivity Design Guide.
PINSIGNALDESCRIPTION
1AUD_MICFront panel microphone input signal
2AUD_GNDGround used by analog audio circuits
3AUD_MIC_BIASMicrophone power
4AUD_VCCFiltered +5V used by analog audio circuits
5AUD_FPOUT_RRight channel audio signal to front panel
6AUD_RET_RRight channel audio signal return from front...

MS-7255 Mainboard
2-18 Front USB Connectors: JUSB1, JUSB2
The mainboard provides two USB 2.0 pinheaders (optional USB 2.0 bracket available)
that are compliant with Intel®
 I/O Connectivity Design Guide. USB 2.0 technology
increases data transfer rate up to a maximum throughput of 480Mbps, which is 40
times faster than USB 1.1, and is ideal for connecting high-speed USB interface
peripherals such as USB HDD, digital cameras, MP3 players, printers, mo-
dems and the like.
PINSIGNALPINSIGNAL
1VCC2VCC...

2-19 Hardware SetupJumpers
Clear CMOS Jumper: JBAT1
There is a CMOS RAM onboard 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, set
the JBAT1 (Clear CMOS Jumper ) to clear data.
JBAT11Clear Data1
3Keep Data1
3Important
You can clear CMOS by shorting 2-3 pin while the system is off. Then return
to 1-2 pin position. Avoid clearing the...

MS-7255 Mainboard
2-20 PCI (Peripheral Component Interconnect) Express Slots
PCI Express architecture provides a high performance I/O infrastructure for Desktop
Platforms with transfer rates starting at 2.5 Giga transfers per second over a PCI
Express x1 lane for Gigabit Ethernet, TV Tuners, 1394 controllers, and general pur-
pose I/O. Also, desktop platforms with PCI Express Architecture will be designed to
deliver highest performance in video, graphics, multimedia and other sophisticated
applications....

2-21 Hardware Setup
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 1Order 2Order 3Order 4
PCI Slot 1INT B#INT C#INT D#INT A#
PCI Slot 2INT C#INT D#INT A#INT B#CH2 Hardware Setup.p65  2006/9/15, 下午 02:1421 

3-1 BIOS SetupChapter 3
BIOS Setup
This chapter provides information on the BIOS Setup
program and allows you to configure  the system for
optimum use.
You may need to run the Setup program when:
²An error message appears on the screen during the
system booting up, and requests you to run SETUP.
²You want to change the default settings for cus-
tomized features.CH3 BIOS Setup.p65  2006/9/15, 下午 02:141 

MS-7255 Mainboard
3-2Entering SetupImportant
1.The items under each BIOS category described in this chapter are under
continuous update for better system performance. Therefore, the descrip-
tion may be slightly different from the latest BIOS and should be held for
reference only.
2.Upon boot-up, the 1st line appearing after the memory count is the BIOS
version. It is usually in the format:
W7255VMS V1.0 031505 where:
1st digit refers to BIOS maker as A = AMI, W = AWARD, and P =
PHOENIX.
2nd - 5th digit...

3-3 BIOS Setup
Getting Help
After entering the Setup menu, the first menu you will see is the Main Menu.
Main Menu
The main menu lists the setup functions you can make changes to. You can use the
arrow keys ( ­¯ ) to select the item. The on-line description of the highlighted setup
function is displayed at the bottom of the screen.
Sub-Menu
If you find a right pointer symbol (as shown in the right  view) appears to the left of
certain fields that means a sub-menu can be
launched from this field. A...

MS-7255 Mainboard
3-4The Main Menu Standard CMOS Features
Use this menu for basic system configurations, such as time, date etc. Advanced BIOS Features
Use this menu to setup the items of AWARD®
 special enhanced features. Advanced Chipset Setup
Use this menu to change the values in the chipset registers and optimize your system’s
performance. Integrated Peripherals
Use this menu to specify your settings for integrated peripherals. Power Management Features
Use this menu to specify your settings for...