MSI NLX LX3 User manual

CHAPTER 1 INTRODUCTION
1-1
The MSI NLX LX3 mainboard is a high-performance personal computer
mainboard based on the Pentium®II processor. The mainboard supports
Intel®82558 Network chip and Creative Lab®Vibra 16x sound chip. An AGP
slot is also available for an AGP VGA card. The Pentium®II processor
supports MMXTM (Multimedia Extension) technology.
The mainboard uses the highly integrated Intel®82440LX AGPset which
optimize the system bandwidth and concurrency with the implementation of
Quad Port Acceleration (QPA). QPA provides 4-port concurrent arbitration
of the processor bus, graphics, PCI bus and SDRAM.
The Intel®82371AB chipset integrates all system control functions such as
ACPI (Advanced Configuration and Power Interface). The ACPI provides
more Energy Saving Features for the OSPM(OS Direct Power Management)
function. The Intel®82371AB chipset also improves the IDE transfer rate by
supporting Ultra DMA/33 IDE that transfers data at the rate of 33MB/s.
The mainboard also supports the LM78/W83781D System Hardware
Monitor Controller as optional function. The System Hardware Monitor
function includes: CPU /power supply/chassis fan revolution detect, CPU/
system voltage monitor, system temperature monitor, and chassis intrusion
detect(optional).
Chapter 1
INTRODUCTION

CHAPTER 1 INTRODUCTION
1.1 Mainboard Features
CPU
lSlot 1 for Pentium®II processor.
lSupports200MHz,233MHz,266MHz,300MHz,and333MHz.
lCore/Busratiosare x2,x2.5,x3,x3.5,x4,x4.5,x5,x5.5,x6andhigher.
SwitchingVoltage Regulator
lOn-board switching mode DC-DC Step Down Regulator.
lConforms to Intel®VRM ver 8.1 specifications.
lOver-Voltage and Over-Current protection.
Chipset
lIntel®82440LXAGPChipset.
ClockGenerator
l66.6MHz clocks are supported.
MainMemory
lSupports six memory banks using three 168-pin unbuffered DIMM
sockets.
lSupportsamaximum memory size of768MB.
lSupportsECC(Error Check Correct) function.
lSupports 3.3v unbuffered DIMM.
lSupports Symmetric and Asymmetric DIMM.
lSupports FP, EDO, and SDRAM memory.
Slots
lOne AGP(Accelerated Graphics Port) slot.
- AGP specification compliant
- AGP66/133MHz 3.3v device support
lNLXinterface.
1-2

CHAPTER 1 INTRODUCTION
1-3
SystemHardwareMonitor
lThis can be used with Intel®LDCM to monitor system voltage, system
temperature & fan rotation speed.
lThis can also be used to monitor overall system status over the network.
lSystem temperature sensor:
- detect Pentium®II processor’s temperature.
lSystem voltage monitor:
- monitorCPU corevoltage, CPU interface voltage(+2.5v), 3.3v,+12v,+5v
lFan speed monitor:
- monitor chassis fan, power fan & CPU cooling fan speed.
lChassis intrusion sensor: (reserved)
- monitor any intrusion on the Chassis.
PowerManagementFeatures
lDoze/Standby/Suspend mode.
lSystem management mode compliant.
lSupport APM 1.2.
lMeet ACPI spec.
lPC97compliant.
Sound
lCreative®Vibra16x audiochip.
lSound BlasterTM 16 compatible.
lSupport Plug and Play.
lFull duplex DMA allowing 8-bit or 16-bit data for record and playback.
l3D audio effects.
lStereo enhancement support.
lAdvanced power management.
Network
lIntel®8255810/100M Ethernet.
lWFW baseline & NET PC specs compliant.
lACPI
lMagic packet filtering to wake-up LAN.
lARP&FLEXIBLEframefiltering.
lSoftware drivers are backwards compatible.
Note: Requires an ATX power supply with 720mA 5VSB (5v Stand by).

CHAPTER 1 INTRODUCTION
1-4
RearMainboardConnectors
lPS/2®keyboard interface and PS/2®mouse interface.
lTwo COM port connectors.
lOne printer port with SPP/EPP/ECP function.
lOne USB connector.
lOne MIDI/Joystick connector.
lOneRJ-45 LANconnector.
lAudio conectors: Speaker/Line-In/Mic.
Dimension
lNLXFormFactor: 21.7cm(L)x 34.6cm(W) x 4layersPCB.
OtherFeatures
lBulkErase Flash ROM.
lSupports DMI.
lSystem Wake-up by modem.
lSystem Wake-up by alarm.
lSoft-power off. (Windows®95)
lPolyfuse function.
- this function works when the electric current is larger than 2A. It will
become an open circuit to protect your mainboard. Turn the power off for
1-3 secs for polyfuse to recover.
lLANwake-up. (reserved)
lKeyboard password wake-up system. (reserved)
lRestore AC power loss status.

CHAPTER 1 INTRODUCTION
1.2 Mainboard Layout
1-5
SLOT 1
DIMM 3
DIMM 2
DIMM 1
T:mouse
B:
keyboard Port
USB
T: LPT
B: COM A
COM B
AGP Slot
Joystick/
MIDI LAN
RJ-45 MIC L-IN SPKR
BATT
+
BIOS
FW82371AB
FW82443LX
CPUFA1
JMODE1
SW1 LM78
(optional)
JP1
JBAT1 J4
JVCC JVSB WAVET1
JP2
Intel®
82558
10/100M
Ethernet
Creative
VIBRA 16x
MS-6113
JSOR1

CHAPTER 2 HARDWARE INSTALLATION
2-1
Chapter 2
HARDWARE INSTALLATION
2.1 Central Processing Unit: CPU
The mainboard operates withIntel®Pentium®II processorwith MMXTM
technology. The mainboard uses a CPU Slot called Slot 1 for easy CPU
installation and a DIP switch (SW1) to set the proper speed for the CPU.
The CPU should always have a Heat Sink and a cooling fan attached to
prevent overheating.

CHAPTER 2 HARDWARE INSTALLATION
2-2
2.1-1 CPU Installation Procedures
A. OEM Pentium®II processor Installation Procedures
There are two kinds of Pentium®II processor that is currently used: the
OEM Pentium®II processor and the Boxed Pentium®II processor. OEM
Pentium®II processor has no Heat Sink, Fan and Heat Sink Support, while
the Boxed Pentium®II processor is provided with Heat Sink w/ fan and Heat
Sink Support.
Required Things:
Pentium®IIprocessor - Processor.
*RetentionMechanism(RM) - Plastic Guide that holds the S.E.C.Catridge
in the Slot 1 connector.
*RetentionMechanismAttachMount(RMAM)-Bolt/Bridgeassemblies
inserted up through the bottom of the
motherboard. RM secures to RMAM ( 2
RMAM required per RM ).
*HeatSink Support Base (HSSBASE) - Plastic support bar mounted to
the mainboard under the ATX heatsink.
(One leg is always bigger than the other one)
Processor
Lock
Retention
Mechanism
Pentium®II
Processor
Heat Sink
W/Fan
Notch Hole
Heat Sink
Support Base Heat Sink
Support Pin
Heat Sink
Support
Top Bar

CHAPTER 2 HARDWARE INSTALLATION
2-3
*HeatSink Support Pin (HSSPIN)- Plastic pins inserted through the
HSSBASE to secure it to the mainboard (2
required per Assembly).
*Heat SinkSupport Top Bar(HSSTOP)- Plastic bar that clips onto the
HSSBASE through the fins on the ATX
heatsink.
**Heat Sink w/ fan - Heat Sink that can be attached to the Pentium®II
processorwith metal clip.
Note:* Provided by MSI mainboard.
** Provided by Special request.
RM
HSSPIN
HSSTOP
HSSBASE
RMAM

CHAPTER 2 HARDWARE INSTALLATION
2-4
SLOT1
Retention
Mechanism
êê
Key
êê
Retention
Mechanism
Attach Mount
Notch
Key
Step 1: Insert the Retention Mechanism Attach Mount at the bottom
of the mainboard.
Step 2: Install the Retention Mechanism.
Look for the key on Slot 1, and match it with the Notch Key on the
Retention Mechanism for proper direction. Then, attach the
Retention Mechanism to the Retention Mechanism Attach Mount.
Use a Screwdriver to secure the Retention Mechanism.

CHAPTER 2 HARDWARE INSTALLATION
2-5
Step 3: Install the Heat Sink Support Base.
Look for the Two holes across Slot 1, and match it with the Two legs
of the Heat Sink Support Base for the proper direction. Take note
that one hole/leg is bigger than the other. The Four top pins of the
Heat Sink Support Base should also be oriented towards Slot 1.
Push the Heat Sink Support Base onto the mainboard, until you hear
a click sound. Check for a perfect fit.
Step 4: Install the Heat Sink Support Pin.
Push the Heat Sink Support Pins onto the two holes of the Heat Sink
Support Base. Check for a perfect fit. These pins are used to secure
the Heat Sink Support Base.
Heat Sink
Support Base
Heat Sink
Support Pin
Leg
pins

CHAPTER 2 HARDWARE INSTALLATION
2-6
Step 5: Install the Heat Sink with Fan to the Processor.
Push down the metal clips, so that they are in line with the back of
the Heat Sink. Be careful, so as not detach the metal clips from the
HeatSink.
In case the metal clips are detached from the Heat Sink, re-attach
them. Look for the arrow on the metal clip. This arrow should be
pointing down and aligned with the Heat Sink Support Base Holder.
Attach the Heat Sink to the processor.
- Look at the back of the Heat Sink and take note of the 2 secure
posts. Insert these 2 Secure posts to the 2 secure holes on the
back of the processor.
- Align the ears of the metal clips with the clip holders on the back of
the processor. Use a screw driver to push the metal clips onto the
clip holders. Check for a perfect fit.
Pentium®II processor (Back)
â
Thearrow
shouldbe
pointing
down.
Metal Clips
Heat Sink w/ Fan
Metal Clips Ear
Metal Clips Ear
Secure
Posts
Heat Sink w/ Fan(Back)
Heat Sink
Base Holder
Secure
holes
Clip Holder
Clip Holder

CHAPTER 2 HARDWARE INSTALLATION
2-7
Step 6: Install the Processor.
Unlock the Processor by pushing in the Processor Locks.
Insert the Processor like inserting a PCI or an ISA card.
Step 7: Lock the Processor Locks.
Secure the CPU by pulling the Processor Locks out.
èç
çè

CHAPTER 2 HARDWARE INSTALLATION
2-8
Step 8: Install the Heat Sink Support Top Bar.
Push the Heat Sink Support Top Bar to the Heat Sink Support Base,
Until you hear a “click” sound. Check for a perfect fit.
The installation is now complete.
Heatsink
Support Top
Bar

CHAPTER 2 HARDWARE INSTALLATION
2-9
B. Boxed Pentium®II processor Installation Procedures
The Boxed Pentium®II processor has a built- in Fan and Heat Sink. It also
has a Heat Sink Support. So if you’re going to use the Boxed processor, all
you need is the Retention Mechanism.
SLOT1
Retention
Mechanism
êê
Key
êê
Retention
Mechanism
Attach Mount
Notch
Key
Step 1: Insert the Retention Mechanism Attach Mount at the bottom
of the mainboard.
Step 2: Install the Retention Mechanism.
Look for the key on Slot 1, and match it with the Notch Key on the
Retention Mechanism for proper direction. Then, attach the
Retention Mechanism to the Retention Mechanism Attach Mount.
Use a Screwdriver to secure the Retention Mechanism.

CHAPTER 2 HARDWARE INSTALLATION
2-10
Step 3: Install the Heat Sink Support Base.
Look for the 2 holes across Slot 1, and match it with the 2 Heat Sink
Support Base. Take note that one hole/base is bigger than the other.
Push the Heat Sink Support Base onto the mainboard, until you hear
a click sound. Check for a perfect fit.
Retention
Mechanism
Notch
Hole
HeatSink
Support Base

CHAPTER 2 HARDWARE INSTALLATION
2-11
PC-3743
HeatSink
Support Lock
Intel®Boxed
PentiumTM II
Processor
Step 4: Install the Heat Sink Support.
Attach the 2 Heat Sink Supports to the sides of the Processor. These
Heat Sink Supports will fit in any direction, so be sure that the Heat
Sink Support Locks are oriented outwards for the proper direction.
HeatSink
Support

CHAPTER 2 HARDWARE INSTALLATION
2-12
PC-3744
Processor
Lock
Heatsink
Support
Lock
Step 5: Unlock the Processor Locks and Heat Sink Support Locks.
Push in the Processor Locks. Open the Heat Sink Support Locks.
Step 6: Insert the Processor like inserting a PCI or an ISA card.

CHAPTER 2 HARDWARE INSTALLATION
2-13
Step 7: Lock the Processor Locks and Heat Sink Support Locks
Secure the CPU by pushing out the Processor Locks. Close the Heat
Sink Support Locks.
The installation is now complete.

CHAPTER 2 HARDWARE INSTALLATION
2-14
5 6 Clock
OFF OFF 66.8MHz
OFF ON 68.5MHz*
ON OFF 75MHz*
SW1 CPU
2.1-2 CPU Core Speed Derivation Procedure
1. The DIP Switch SW1 (5 & 6) is used to adjust the CPU clock frequency.
Note: We don’t guarantee 68.5MHz and
75MHz bus frequency. It might
not be stable.

CHAPTER 2 HARDWARE INSTALLATION
2-15
1 2 3 4 Core/BusRatio
ON OFF ON ON 2.5
ON ON OFF ON 3
ON OFF OFF ON 3.5
ON ON ON OFF 4
ON OFF ON OFF 4.5
ON ON OFF OFF 5
ON OFF OFF OFF 5.5
OFF ON ON ON 6
OFF OFF ON ON 6.5
OFF ON OFF ON 7
OFF OFF OFF ON 7.5
OFF ON ON OFF 8
2. The DIP Switch SW1 (1, 2, 3, and 4) is used to set the Core/Bus (Frac-
tion) ratio of the CPU. The actual core speed of the CPU is the Host
Clock Frequency multiplied by the Core/Bus ratio. For example:
If CPUClock = 66MHz
Core/Bus ratio = 1.5
then CPU core speed = Host Clockx Core/Bus ratio
= 66MHzx1.5
= 100MHz
SW1 CPU
3. The PCI Bus Clock isfixed at 33MHz.