MS-6791 (v1.X) M-ATX Mainboard User’s Guide Version 1.
Manual Rev: 1.0 Release Date: July 2003 FCC-B Radio Frequency Interference Statement This equipment has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
Copyright Notice The material in this document is the intellectual property of MICRO-STAR INTERNATIONAL. We take every care in the preparation of this document, but no guarantee is given as to the correctness of its contents. Our products are under continual improvement and we reserve the right to make changes without notice. Trademarks All trademarks are the properties of their respective owners. AMD, Athlon™, Athlon™ XP, Thoroughbred™, and Duron™ are registered trademarks of AMD Corporation.
Safety Instructions 1. 2. 3. 4. 5. Always read the safety instructions carefully. Keep this User’s Manual for future reference. Keep this equipment away from humidity. Lay this equipment on a reliable flat surface before setting it up. The openings on the enclosure are for air convection hence protects the equipment from overheating. DO NOT COVER THE OPENINGS. 6. Make sure the voltage of the power source and adjust properly 110/220V before connecting the equipment to the power inlet. 7.
CONTENTS FCC-B Radio Frequency Interference Statement ........................................... ii Copyright Notice .......................................................................................... iii Revision History ........................................................................................... iii Technical Support ......................................................................................... iii Safety Instructions ......................................................
Parallel Port Connector: LPT1 ...................................................... 2-14 Audio Port Connectors ............................................................... 2-15 Connectors ......................................................................................... 2-16 Floppy Disk Drive Connector: FDD1 ........................................... 2-16 Fan Power Connectors ................................................................ 2-17 Front Panel Connector: JFP1 or JLEG1 ..............
Chapter 3. BIOS Setup .............................................................................. 3-1 Entering Setup ...................................................................................... 3-2 Control Keys ................................................................................. 3-2 Getting Help .................................................................................. 3-3 The Main Menu ...................................................................................
Getting Started Getting Started Thank you for purchasing the MS-6791 v1.x M-ATX mainboards. The MS-6791 is a superior computer motherboard based on SiS648FX/661FX and SiS963/963L chipsets for optimal system efficiency. Designed to fit the advanced Intel® Pentium® 4 Northwood/Prescott processors in the 478 pin package, the MS-6791 delivers a high performance and professional desktop platform solution.
MS-6791 M-ATX Mainboard Mainboard Specifications CPU h Supports Socket 478 for P4 processor with 400/533/800 MHz (100/133/200 MHz QDIR) h Core frequency up to 3.2GHz or above Chipset h SiS® 648FX/661FX chipsets - Supports Intel Pentium 4 processors with data transfer rate up to 800MHz - Supports 64-bit high performance DDR400/DDR333/DDR266 memory controller - Supports AGP 8X/4X interface at 0.8v or 4x at 1.
Getting Started - 2 serial ports (COM A + COM B) - 1 parallel port supports SPP/EPP/ECP mode - 1 audio port (Line-in, Line-out, Mic-in) - 6 high speed USB 2.
MS-6791 M-ATX Mainboard Mainboard Layout JCPU_TEMP Top : mouse Bottom: keyboard PWRFAN1 ATX Power Supply CPUFAN1 Top : Parallel Port FDD 1 Bottom: COM A COM B (SiS648FX) VGA (SiS661FX) JPW1 USB ports IDE 2 SiS 648FX/661FX BIOS_WP1 BIOS IR1 T: Line-In M:Line-Out B:Mic IDE 1 NBFAN1 Top: LAN Jack Bottom: USB ports Winbond W83697HF MDM_IN1 DDR 1 JLAN1 RealTek 8100C DDR 2 AGP Slot PCI Slot1 CD_IN2 PCI Slot2 PWRSW1 SiS 963/963L CD_IN1 PCI Slot3 CHSFAN1 BATT + JFP1 Realtek 8801B
Hardware Setup Chapter 2. Hardware Setup Hardware Setup This chapter tells you how to install the CPU, memory modules, and expansion cards, as well as how to setup the jumpers on the mainboard. Also, it provides the instructions on connecting the peripheral devices, such as the mouse, keyboard, etc. While doing the installation, be careful in holding the components and follow the installation procedures.
MS-6791 M-ATX Mainboard Quick Components Guide CPU, p.2-3 CPUFAN, p.2-17 JCPU_TEMP, p.2-28 JPW1, p.2-9 DDR DIMMs, p.2-7 PWRFAN1, p.2-17 CONN1, p.2-9 Back Panel I/O, p.2-10 FDD1, p.2-16 NBFAN, p.2-17 BIOS_WP1, p.2-30 IDE1, IDE2, p.2-19 IR1, p.2-28 PWRSW1, p.2-28 CHSFAN, p.2-17 JGLED1, p.2-27 JFP1, p.2-18 JLEG1, p.2-18 JLAN1, p.2-30 MDM_IN1, p.2-22 CD_IN1, p.2-22 CD_IN2, p.2-22 USB Ports, p.2-24 JMR1, p.2-26 JSP1, p.2-23 JAUDIO1, p.2-20 JCI1, p.2-27 JSMI1, p.2-27 JAUD1, p.2-20 JWOL1, p.
Hardware Setup Central Processing Unit: CPU The mainboard supports Intel® Pentium® 4 Northwood/Prescott processor in the 478 pin package. The mainboard uses a CPU socket called PGA478 for easy CPU installation. When you are installing the CPU, make sure the CPU has a heat sink and a cooling fan attached on the top to prevent overheating. If you do not find the heat sink and cooling fan, contact your dealer to purchase and install them before turning on the computer.
MS-6791 M-ATX Mainboard CPU Installation Procedures for Socket 478 1. Please turn off the power and unplug the power cord before installing the CPU. 2. Pull the lever sideways away from the socket. Make sure to raise the lever up to a 90degree angle. 3. Look for the gold arrow. The gold arrow should point towards the lever pivot. The CPU can only fit in the correct orientation. 4. If the CPU is correctly installed, the pins should be completely embedded into the socket and can not be seen.
Hardware Setup Installing the CPU Fan As processor technology pushes to faster speeds and higher performance, thermal management becomes increasingly important. To dissipate heat, you need to attach the CPU cooling fan and heatsink on top of the CPU. Follow the instructions below to install the Heatsink/Fan: 1. Locate the CPU and its retention mechanism on the motherboard. 2. Position the heatsink onto the retention mechanism. retention mechanism 3. Mount the fan on top of the heatsink. 4.
MS-6791 M-ATX Mainboard 5. Connect the fan power cable from the mounted fan to the 3-pin fan power connector on the board.
Hardware Setup Memory The mainboard provides 2 slots for 184-pin DDR SDRAM DIMM (Double In-Line Memory Module) modules and supports the memory size up to 2GB. You can install PC3200/DDR400, PC2700/DDR333, PC2100/DDR266 modules on the DDR DIMM slots (DIMM 1~2). DDR Slots Introduction to DDR SDRAM DDR (Double Data Rate) SDRAM is similar to conventional SDRAM, but doubles the rate by transferring data twice per cycle. It uses 2.5 volts as opposed to 3.
MS-6791 M-ATX Mainboard DDR DIMM Module Combination Install at least one DIMM module on the slots. Memory modules can be installed on the slots in any order. You can install either single- or doublesided modules to meet your own needs. Memory modules can be installed in any combination as follows: Slot Memory Module Total Memory DIMM 1 (Bank 0 & 1) DIMM 2 (Bank 2 & 3) S/D 64MB~1GB S/D 64MB~1GB Maximum System Memory Supported S: Single Side 64MB~2GB D: Double Side Installing DDR Modules 1.
Hardware Setup Power Supply The mainboard supports ATX power supply for the power system. Before inserting the power supply connector, always make sure that all components are installed properly to ensure that no damage will be caused. ATX 20-Pin Power Connector: CONN1 This connector allows you to connect to an ATX power supply. To connect to the ATX power supply, make sure the plug of the power supply is inserted in the proper orientation and the pins are aligned.
MS-6791 M-ATX Mainboard Back Panel The back panel provides the following connectors: For SiS 661FX LAN (Optional) Parallel Mouse L-in L-out Keyboard COM VGA USB USB MIC For SiS 648FX LAN (Optional) Parallel Mouse L-in L-out Keyboard 2-10 COM COM USB USB MIC
Hardware Setup Keyboard Connector The mainboard provides a standard PS/2® keyboard mini DIN connector for attaching a PS/2® keyboard. You can plug a PS/2® keyboard directly into this connector.
MS-6791 M-ATX Mainboard USB 2.0 Connectors The mainboard provides an OHCI (Open Host Controller Interface) Universal Serial Bus root for attaching USB devices such as keyboard, mouse or other USB-compatible devices. You can plug the USB device directly into the connector.
Hardware Setup Serial Port Connectors: COM A & COM B The mainboard offers two 9-pin male DIN connectors as serial port COM A & COM B. The ports are 16550A high speed communication ports that send/receive 16 bytes FIFOs. You can attach a serial mouse or other serial devices directly to the connectors.
MS-6791 M-ATX Mainboard Parallel Port Connector: LPT1 The mainboard provides a 25-pin female centronic connector as LPT. A parallel port is a standard printer port that supports Enhanced Parallel Port (EPP) and Extended Capabilities Parallel Port (ECP) mode.
Hardware Setup Audio Port Connectors Line Out is a connector for Speakers or Headphones. Line In is used for external CD player, Tape player, or other audio devices. Mic is a connector for microphones. Line In 1/8” Stereo Audio Connectors Line Out MIC MSI Reminds You... The mainboard offers 6-channel audio operation and can turn rear audio connectors from 2-channel to 4-/6-channel audio. For more information on 6-channel audio operation, please refer to Appendix: Using 4- or 6-Channel Audio Function.
MS-6791 M-ATX Mainboard Connectors The mainboard provides connectors to connect to FDD, IDE HDD, case, LAN, USB Ports, IR module and CPU/System/Power Supply FAN. Floppy Disk Drive Connector: FDD1 The mainboard provides a standard floppy disk drive connector that supports 360K, 720K, 1.2M, 1.44M and 2.88M floppy disk types.
Hardware Setup Fan Power Connectors: CPUFAN1/CHSFAN1/NBFAN1/ PWRFAN1 The CPUFAN1 (processor fan), NBFAN1 (NorthBridge fan), PWRFAN1 (power fan) and CHSFAN1 (system fan) support system cooling fan with +12V. It supports three-pin head connector. When connecting the wire to the connectors, always take note that the red wire is the positive and should be connected to the +12V, the black wire is Ground and should be connected to GND.
MS-6791 M-ATX Mainboard Front Panel Connector: JFP1 or JLEG1 The mainboard provides one front panel connector, JFP1 or JLEG1, for electrical connection to the front panel switches and LEDs. JFP1 is compliant with Intel® Front Panel I/O Connectivity Design Guide.
Hardware Setup Hard Disk Connectors: IDE1 & IDE2 The mainboard has a 32-bit Enhanced PCI IDE and Ultra DMA 66/100/ 133 controller that provides PIO mode 0~5, Bus Master, and Ultra DMA 66/ 100/133 function. You can connect up to four hard disk drives, CD-ROM, 120MB Floppy and other devices. IDE2 IDE1 IDE1 (Primary IDE Connector) The first hard drive should always be connected to IDE1. IDE1 can connect a Master and a Slave drive.
MS-6791 M-ATX Mainboard Front Panel Audio Connector: JAUD1 or JAUDIO1 The mainboard provides one front panel audio connector, JAUD1 or JAUDIO1, for you to connect to the front panel audio. JAUD1 is compliant with Intel® Front Panel I/O Connectivity Design Guide.
Hardware Setup JAUD1 Pin Definition PIN SIGNAL DESCRIPTION 1 2 3 4 5 6 7 8 9 10 AUD_MIC AUD_GND AUD_MIC_BIAS AUD_VCC AUD_FPOUT_R AUD_RET_R HP_ON KEY AUD_FPOUT_L AUD_RET_L Front panel microphone input signal Ground used by analog audio circuits Microphone power Filtered +5V used by analog audio circuits Right channel audio signal to front panel Right channel audio signal return from front panel Reserved for future use to control headphone amplifier No pin Left channel audio signal to front panel Left c
MS-6791 M-ATX Mainboard CD-In Connector: CD_IN1 This connector is provided for CD-ROM audio. Modem-In Connector: MDM_IN1 The connector is for modem with internal audio connector. Aux Line-In Connector: CD_IN2 The connector is for DVD add-on card with Line-in connector.
Hardware Setup SPDIF-Out Connector: JSP1 This connector is used to connect SPDIF (Sony & Philips Digital Interconnect Format) interface for digital audio transmission.
MS-6791 M-ATX Mainboard Front USB Connectors: JUSB1/2 or JUSB3/4 The mainboard provides two USB 2.0 pinheaders (optional USB 2.0 Bracket available). Users can choose either JUSB1/JUSB2 or JUSB3/JUSB4 depending on the model they purchased. The difference between these front USB connectors is that JUSB1/JUSB2 are compliant with Intel® Front Panel 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.
Hardware Setup IEEE 1394 Connectors: J1394_1 & J1394_2 The mainboard provides two 1394 pin headers that allow you to connect optional IEEE 1394 ports.
MS-6791 M-ATX Mainboard Wake On LAN Connector: JWOL This connector allows you to connect to a LAN card with Wake On LAN function. You can wake up the computer via remote control through a local area network. Wake On Ring Connector: JMR1 This connector allows you to connect to a modem card with Wake On Ring function. The connector will power up the system when a signal is received through the modem card.
Hardware Setup Power Saving Switch Connector: JSMI1 Attach a power saving switch to this connector. Pressing the switch once will have the system enter the sleep state. Press any key to wake up the system. Power Saving LED Connector: JGLED1 This allows you to connect to a power saving LED. The LED will be lit when the system enters the suspend mode. Chassis Intrusion Switch Connector: JCI1 This connector is connected to a 2-pin chassis switch. If the chassis is opened, the switch will be short connected.
MS-6791 M-ATX Mainboard IrDA Infrared Module Header: IR1 The connector allows you to connect to IrDA Infrared module. You must configure the setting through the BIOS setup to use the IR function. IR1 is compliant with Intel® Front Panel I/O Connectivity Design Guide. Independent Power Switch Connector: PWRSW1 The connector is connected to an independent power switch on the case. Touch the power switch’s touch pad will turn on/off the computer.
Hardware Setup Jumpers The motherboard provides the following jumpers for you to set the computer’s function. This section will explain how to change your motherboard’s function through the use of jumpers. 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.
MS-6791 M-ATX Mainboard LAN Enable/Disable Jumper: JLAN1 The jumper is used to enable or disable the onboard LAN function. The jumper is available only when LAN is integrated on the board. BIOS Flash Jumper: BIOS_WP1 This jumper is used to lock or unlock the boot block area on BIOS. When unlocked, the BIOS boot block area can be updated. When locked, the BIOS boot block area cannot be updated.
Hardware Setup Slots The motherboard provides one AGP slot and three 32-bit PCI bus slots. AGP Slot PCI Slots 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 mainboard supports 4x (1.07Gbps) and 8x (2.1Gbps) 1.5V AGP cards.
MS-6791 M-ATX Mainboard 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.
BIOS Setup Chapter 3. BIOS Setup 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: An error message appears on the screen during the system booting up, and requests you to run SETUP. You want to change the default settings for customized features.
MS-6791 M-ATX Mainboard Entering Setup Power on the computer and the system will start POST (Power On Self Test) process. When the message below appears on the screen, press key to enter Setup. Press DEL to enter SETUP If the message disappears before you respond and you still wish to enter Setup, restart the system by turning it OFF and On or pressing the RESET button. You may also restart the system by simultaneously pressing , , and keys.
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 control keys ( ↑↓ ) to select the item. The on-line description of the highlighted setup function is displayed at the bottom of the screen.
MS-6791 M-ATX Mainboard The Main Menu Once you enter Phoenix-Award® BIOS CMOS Setup Utility, the Main Menu (Figure 1) will appear on the screen. The Main Menu allows you to select from twelve setup functions and two exit choices. Use arrow keys to select among the items and press to accept or enter the sub-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 special enhanced features.
BIOS Setup PC Health Status This entry shows your PC health status. Frequency/Voltage Control Use this menu to specify your settings for frequency/voltage control. Load Fail-Safe Defaults Use this menu to load the BIOS values for the best system performance, but the system stability may be affected. Load Optimized Defaults Use this menu to load factory default settings into the BIOS for stable system performance operations. Set Supervisor Password Use this menu to set Supervisor Password.
MS-6791 M-ATX Mainboard Standard CMOS Features The items in Standard CMOS Features Menu are divided into 11 categories. Each category includes no, one or more than one setup items. Use the arrow keys to highlight the item and then use the or keys to select the value you want in each item. Date This allows you to set the system to the date that you want (usually the current date). The format is . day Day of the week, from Sun to Sat, determined by BIOS. Read-only.
BIOS Setup define your own drive type manually. If you select Manual, related information is asked to be entered to the following items. Enter the information directly from the keyboard. This information should be provided in the documentation from your hard disk vendor or the system manufacturer. Access Mode The settings are CHS, LBA, Large, Auto. Capacity The formatted size of the storage device. Cylinder Number of cylinders. Head Number of heads. Precomp Write precompensation.
MS-6791 M-ATX Mainboard Advanced BIOS Features Quick Boot Setting the item to Enabled allows the system to boot within 5 seconds since it will skip some check items. Available options: Enabled, Disabled. Anti-Virus Protection The item is to set the Virus Warning feature for IDE Hard Disk boot sector protection. If the function is enabled and any attempt to write data into this area is made, BIOS will display a warning message on screen and beep. Settings: Disabled and Enabled.
BIOS Setup Settings: Enabled, Disabled. CPU L1 & L2 Cache The item allows you to turn on or off CPU’s internal (L1) and external (L2) cache. Settings: Enabled and Disabled. CPU L2 Cache ECC Checking This setting allows you to enable or disable the ECC (Error-Correcting Code) feature for error detection and correction when data passes through L2 cache memory. Setting options: Enabled, Disabled. SwapFloppy Setting to Enabled will swap floppy drives A: and B:.
MS-6791 M-ATX Mainboard Security Option This specifies the type of BIOS password protection that is implemented. Settings are described below: Option Setup Description The password prompt appears only when end users try to run Setup. System A password prompt appears every time when the computer is powered on or when end users try to run Setup. HDD S.M.A.R.T. Capability This allows you to activate the S.M.A.R.T. (Self-Monitoring Analysis & Reporting Technology) capability for the hard disks. S.M.A.R.
BIOS Setup Advanced Chipset Features MSI Reminds You... Change these settings only if you are familiar with the chipset. DRAM Clock/Drive Control Press and the following sub-menu appears. Current CPU/DRAM Frequency It shows the current CPU/DRAM frequency.
MS-6791 M-ATX Mainboard DRAM Frequency This item is used to configure the clock frequency of the installed DRAM. Settings: By SPD, 100MHz, 133MHz, 166MHz, 200MHz. DRAM Timing Control Selects whether DRAM timing is controlled by the SPD (Serial Presence Detect) EEPROM on the DRAM module. Setting to By SPD enables DRAM timings to be determined by BIOS based on the configurations on the SPD. Selecting Manual allows users to configure the DRAM timings manually.
BIOS Setup AGP & P2P Bridge Control Press and the following sub-menu appears. AGP Aperture Size This setting controls just how much system RAM can be allocated to AGP for video purposes. The aperture is a portion of the PCI memory address range dedicated to graphics memory address space. Host cycles that hit the aperture range are forwarded to the AGP without any translation. The option allows the selection of an aperture size of 4MB, 8MB, 16MB, 32MB, 64MB, 128MB, 256MB, 512MB and 1G.
MS-6791 M-ATX Mainboard Integrated Peripherals SIS OnChip IDE Device Press to enter the sub-menu and the following screen appears: Internal PCI/IDE This setting enables or disables the internal primary and secondary PCI & IDE controllers. Setting options: Disabled, Primary, Secondary, Both.
BIOS Setup mode (0-4) for each of the four IDE devices that the onboard IDE interface supports. Modes 0 through 4 provide successively increased performance. In Auto mode, the system automatically determines the best mode for each device. The settings are: Auto, Mode 0, Mode 1, Mode 2, Mode 3, Mode 4.
MS-6791 M-ATX Mainboard USB 2.0 Supports Set to Enabled if you need to use any USB 2.0 device in the operating system that does not support or have any USB 2.0 driver installed, such as DOS and SCO Unix. Setting options: Disabled, Enabled. USB Mouse/Keyboard Support Set to Enabled if your need to use an USB mouse/keyboard in the operating system that does not support or have any USB driver installed, such as DOS and SCO Unix.
BIOS Setup Onboard FDC Controller Select Enabled if your system has a floppy disk controller (FDD) installed on the system board and you wish to use it. If you install add-on FDC or the system has no floppy drive, select Disabled in this field. The settings are: Enabled and Disabled. Onboard Serial Port 1/Port 2 Select an address and corresponding interrupt for the first and second serial ports. The settings are: 3F8/IRQ4, 2E8/IRQ3, 3E8/IRQ4, 2F8/IRQ3, Disabled, Auto.
MS-6791 M-ATX Mainboard Onboard Parallel Port There is a built-in parallel port on the on-board Super I/O chipset that provides Standard, ECP, and EPP features.
BIOS Setup Midi Port IRQ This setting assigns an IRQ for the midi port. Settings are: 5, 10. Init Display First This item specifies which VGA card is your primary graphics adapter. Settings: PCI Slot and AGP. Onboard Lan Device Select Enabled to activate the onboard LAN controller. Setting options: Enabled, Disabled. Onboard Lan Boot ROM This setting determines whether or not to activate the boot ROM of the onboard LAN chip. Setting options: Enabled, Disabled.
MS-6791 M-ATX Mainboard Power Management Setup MSI Reminds You... S3-related functions described in this section are available only when your BIOS supports S3 sleep mode. Sleep State This item specifies the power saving modes for ACPI function. If your operating system supports ACPI, such as Windows 98SE, Windows ME and Windows 2000, you can choose to enter the Standby mode in S1(POS) or S3(STR) fashion through the setting of this field. Options are: S1/POS The S1 sleep mode is a low power state.
BIOS Setup Min Saving Minimum Power Management. Suspend Mode=1 Hour Max Saving Maximum Power Management. Suspend Mode=1 Min User Define Allows end users to configure each mode separately. Suspend Mode If system activity is not detected for the length of time specified in this field, all devices except CPU will be shut off. Settings: Disabled, 1 Min, 2 Min, 4 Min, 8 Min, 10 Min, 20 Min, 30 Min, 40 Min, 1 Hour. MODEM Use IRQ This determines the IRQ in which the MODEM can use.
MS-6791 M-ATX Mainboard PM Wake Up Events Press and the following sub-menu appears. IRQ [3-7, 9-15], NMI & IRQ 8 Break Suspend This setting enables/disables the monitoring of the specified IRQ line. If set to Enabled, the activity of the specified IRQ line will prevent the system from entering power saving modes or awaken it from power saving modes. Setting options: Disabled, Enabled.
BIOS Setup Power, Wake, Any Key. PS2MS Wake Up from S3/S4/S5 This setting allows the activity of the mouse to wake up the system from S3/S4/S5 state. Settings are: Enabled and Disabled. MSI Reminds You... 1. You need to install a modem card supporting power on function for “Wake Up On Ring” function. 2. If you have enabled the“PS2MS Wake Up from S3/S4/S5” function, you need to click the mouse to power on the system.
MS-6791 M-ATX Mainboard PNP/PCI Configurations This section describes configuring the PCI bus system and PnP (Plug & Play) feature. PCI, or Peripheral Component Interconnect, is a system which allows I/O devices to operate at speeds nearing the speed the CPU itself uses when communicating with its special components. This section covers some very technical items and it is strongly recommended that only experienced users should make any changes to the default settings.
BIOS Setup Press and you will enter the sub-menu of the items. IRQ Resources list IRQ 3/4/5/7/9/10/11/12/14/15 for users to set each IRQ a type depending on the type of device using the IRQ. Settings are: PCI Device For Plug & Play compatible devices designed for PCI bus architecture. Reserved The IRQ will be reserved for further request.
MS-6791 M-ATX Mainboard PC Health Status This section shows the status of your CPU, fan, overall system status, etc. Monitor function is available only if there is hardware monitoring mechanism onboard. Case Open Warning The field enables or disables the feature of recording the chassis intrusion status and issuing a warning message if the chassis is once opened. To clear the warning message, set the field to Reset. The setting of the field will automatically return to Enabled later.
BIOS Setup Frequency/Voltage Control Use this menu to specify your settings for frequency/voltage control. Auto Detect DIMM/PCI Clk This option allows you to enable/disable the feature of auto detecting the clock frequency of the installed DIMM/PCI bus. The settings are: Enabled, Disabled. Spread Spectrum When the motherboard’s clock generator pulses, the extreme values (spikes) of the pulses creates EMI (Electromagnetic Interference).
MS-6791 M-ATX Mainboard Load Fail-Safe/Optimized Defaults The two options on the main menu allow users to restore all of the BIOS settings to the default Fail-Safe or Optimized values. The Optimized Defaults are the default values set by the mainboard manufacturer specifically for optimal performance of the mainboard. The Fail-Safe Defaults are the default values set by the BIOS vendor for stable system performance.
BIOS Setup Set Supervisor/User Password When you select this function, a message as below will appear on the screen: Type the password, up to eight characters in length, and press . The password typed now will replace any previously set password from CMOS memory. You will be prompted to confirm the password. Retype the password and press . You may also press to abort the selection and not enter a password.
Using 4- or 6-Channel Audio Function Appendix: Using 4- or 6-Channel Audio Function The motherboard is equipped with Realtek ALC650/655 chip, which provides support for 6-channel audio output, including 2 Front, 2 Rear, 1 Center and 1 Subwoofer channel. ALC650/655 allows the board to attach 4 or 6 speakers for better surround sound effect. The section will tell you how to install and use 4-/6-channel audio function on the board.
MS-6791 M-ATX Mainboard Installing the Audio Driver You need to install the driver for Realtek ALC650/655 chip to function properly before you can get access to 4-/6-channel audio operations. Follow the procedures described below to install the drivers for different operating systems. Installation for Windows 98SE/ME/2000/XP For Windows® 2000, you must install Windows® 2000 Service Pack2 or later before installing the driver.
Using 4- or 6-Channel Audio Function 3. Click Next to start installing files into the system. 4. Click Finish to restart the system.
MS-6791 M-ATX Mainboard Using 4- or 6-Channel Audio Function After installing the audio driver, you are able to use the 4-/6-channel audio feature now. To enable 4- or 6-channel audio operation, first connect 4 or 6 speakers to the appropriate audio connectors, and then select 4- or 6channel audio setting in the software utility.
Using 4- or 6-Channel Audio Function 3 2 5 4 6 A-5
MS-6791 M-ATX Mainboard Connecting the Speakers When you have set the Multi-Channel Audio Function mode properly in the software utility, connect your speakers to the correct phone jacks in accordance with the setting in software utility. 2-Channel Mode for Stereo-Speaker Output Refer to the following diagram and caption for the function of each phone jack on the back panel when 2-Channel Mode is selected.
Using 4- or 6-Channel Audio Function 4-Channel Mode for 4-Speaker Output The audio jacks on the back panel always provide 2-channel analog audio output function, however these audio jacks can be transformed to 4- or 6- channel analog audio jacks by selecting the corresponding multi-channel operation from No. of Speakers. Refer to the following diagram and caption for the function of each jack on the back panel when 4-Channel Mode is selected.
MS-6791 M-ATX Mainboard 6-Channel Mode for 6-Speaker Output Refer to the following diagram and caption for the function of each jack on the back panel when 6-Channel Mode is selected. Back Panel 1 Line Out (Center and Subwoofer channel) 2 * Line Out (Rear channels) 3 * Line Out (Front channels) 2 3 * Both Line In and MIC function are converted to Line Out function when 4-Channel Mode for 6-Speaker Output is selected. 1 MSI Reminds You...
Using 4- or 6-Channel Audio Function Testing the Connected Speakers To ensure that 4- or 6-channel audio operation works properly, you may need to test each connected speaker to make sure every speaker work properly. If any speaker fails to make sound, then check whether the cable is inserted firmly to the connector or replace the bad speakers with good ones. Testing Each Speaker 1. Click the audio icon from the window tray at the lower-right corner of the screen. 2. Click the Speaker Test tab. 3.
MS-6791 M-ATX Mainboard 4. While you are testing the speakers in 6-Channel Mode, if the sound coming from the center speaker and subwoofer is swapped, you should select Swap Center/Subwoofer Output to readjust these two channels.
Using 4- or 6-Channel Audio Function Playing KaraOK The KaraOK function will automatically remove human voice (lyrics) and leave melody for you to sing the song. Note that this function applies only for 2-channel audio operation. Playing KaraOK 1. Click the audio icon from the window tray at the lower-right corner of the screen. 2. In the Sound Effect tab, select Voice Cancellation under “KaraOK.” 3. Click OK to close this window.
