MSI ATX BX2 User manual

CHAPTER 1 INTRODUCTION
1-1
The ATX BX2 mainboard is a high-performance personal computer
mainboard based on the Pentium®II processor. The Pentium®II processor
supports MMXTM (Multimedia Extension) technology.
The mainboard uses the highly integrated Intel®82443BX AGP chipset to
support the PCI/ISA and Green standards, and to provide the Host/AGP
bridge. The Intel®82371EB 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®82371EB chipset also improves the IDE
transfer rate by supporting Ultra DMA/33 IDE that transfers data at the rate
of33MB/s.
The mainboard also supports the System Hardware Monitor Controller as an
optional function. This 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.
lSupports233MHz,266MHz,300MHz,333MHz, 400MHz,andfaster.
lCore/Busratiosare x2,x2.5,x3,x3.5,x4,x4.5,x5,x5.5,x6andhigher.
SwitchingVoltageRegulator
lOn-board switching mode DC-DC Step Down Regulator.
lConforms to Intel®VRM ver 8.2 specifications.
lOver-Voltage and Over-Current protection.
Chipset
lIntel®82440BXAGP chipset.
ClockGenerator
l66.6MHz and 100MHz clocks are supported.
l68/75/83MHzand 103/112MHzclocks(reserved)
MainMemory
lSupports six memory banks using three 168-pin unbuffered DIMM
sockets.
lSupportsamaximummemorysizeof384MB(8Mx8) or768MB(16Mx4)
registered DIMM only.
lSupportsECC(1-bitErrorCodeCorrect)function.
lSupports only 3.3v SDRAM DIMM.
Slots
lOne AGP(Accelerated Graphics Port) slot.
- AGP specification compliant
- AGP66/133MHz3.3vdevicesupport
lFour 32-bit Master PCI Bus slots and three 16-bit ISA bus slots wherein
one shared slot that can be used as ISA or PCI.
lSupports 3.3v/5v PCI bus Interface.
1-2

CHAPTER 1 INTRODUCTION
1-3
On-BoardIDE
lAn IDE controller on the Intel®82371EB PCI chipset provides IDE HDD/
CD-ROM with PIO, Bus Master and Ultra DMA/33 operation modes.
lCan connect up to four IDE devices.
On-BoardPeripherals
lOn-BoardPeripheralsinclude:
-1floppyportsupports2FDDwith360K,720K,1.2M,1.44Mand
2.88Mbytes.
-2serialports(COMA+COMB)
- 1 parallel port supports SPP/EPP/ECP mode
- 2 USB ports
- 1 IrDA connector for Fast IrDA. (reserved)
BIOS
lThe mainboard BIOS provides “Plug & Play” BIOS which detects the
peripheral devices and expansion cards of the board automatically.
lThe mainboard provides a Desktop Management Interface(DMI) function
which records your mainboard specifications.
lThe mainboard provides “CPU Plug & Play” function. (reserved)
CPU Plug & Play - the user don’t need jumper/DIP switch to set the CPU
speed setting. The BIOS is used to set the speed.
SystemHardwareMonitor(optional)
lCPU/Power Supply/Chassis Fan Revolution Detect
lCPU Fan Control (the fan will automatically stop when the system enters
suspend mode)
lSystem Voltage Detect
lCPU Overheat Warning (reserved)
lChassis Intrusion Detect (reserved)
lDisplay Actual Current Voltage
RTC
lPIIX4(82371EB)built-inRTC.

CHAPTER 1 INTRODUCTION
1-4
KeyboardConnector
lPS/2®keyboard interface and PS/2®mouse interface.
Dimension
lATXFormFactor: 30cm(L)x18.6cm(W)x4 layersPCB.
lDouble deck I/O connectors, compatible with Intel®Venus Mainboard.
Mounting
l6 mounting holes.
OtherFeatures
lKeyboard Password Wake-Up.(reserved)
lLANWake-Up.
lInternal/ExternalModem Wake-Up.
lAC Power Loss Restore.

CHAPTER 1 INTRODUCTION
1.2 Mainboard Layout
FDD IDE1
IDE2
DIMM 1 DIMM 2 DIMM 3
Top: mouse
Top: Port1
USB
Bottom:
Port2
Top: LPT
Bottom:
COMA
COMB
ATX
Power Supply
JP1
CPUFAN1
PCI SLOT 3
PCI SLOT 2
PCI SlOT 1
SLOT 1
AGP Slot
PCI SLOT 4
JGS1
JGL1
ISA SLOT 2
ISA SLOT 3
BATT
+
BIOS
JMODE1
SFAN1
(optional)
IR1
JSOR1
(optional)
J1
J2
JFP1
FW82371EB JBAT1
1-5
JVSB
FW82443BX
JRMS1
JWOL
JMDM1
Bottom:
keyboard
ISA SLOT 1
PSFAN1
(optional)
SW1

CHAPTER 2 HARDWARE INSTALLATION
2-1
Chapter 2
HARDWARE INSTALLATION
2.1 Central Processing Unit: CPU
The mainboard operates with Intel®Pentium®IIprocessor. The mainboard
used a CPU Slot called Slot 1 for easy CPU installation. To set the proper
speed for the CPU, you should first check your mainboard. There are two
kinds of mainboard: CPU Plug & Play mainboard & Standard mainboard.
CPU Plug & Play mainboard speed setting is set on the BIOS setting.
Standard mainboard speed setting is set by DIP switch. 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
Different kinds of Pentium®II processor that is currently used: the OEM
version, the Boxed version, and CeleronTM. OEM Pentium®II Processor has
no Heat Sink, Fan and Heat Sink Support, the Boxed Pentium®II Processor
is provided with Heat Sink w/ fan and Heat Sink Support, while the
CeleronTM processor is a plane processor card without cover or heatsink..
Required Things:
Pentium®IIprocessor- Processor.
*RetentionMechanism(RM)- PlasticGuidethat holds the S.E.C. Catridge
in the Slot 1 connector.
*RetentionMechanismAttachMount(RMAM)-Bolt/Bridge assemblies
inserted up through the bottom of the
motherboard. RM secures to RMAM ( 2
RMAM required per RM ).
*Heat SinkSupport 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 thePentium®II
processorwithmetalclip.
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