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 MMX
TM
(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
of 33MB/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
l Slot 1 for Pentium
®
II processor .
l Supports 233MHz, 266MHz, 300MHz, 333MHz, 400MHz, and faster .
l Core/Bus ratios are x2, x2.5, x3, x3.5, x4, x4.5, x5, x5.5, x6 and higher .
Switching V oltage Regulator
l On-board switching mode DC-DC Step Down Regulator .
l Conforms to Intel
®
VRM ver 8.2 specifications.
l Over-Voltage and Over-Current protection.
Chipset
l Intel
®
82440BX AGP chipset.
Clock Generator
l 66.6MHz and 100MHz clocks are supported.
l 68/75/83MHz and 103/112MHz clocks (reserved)
Main Memory
l Supports six memory banks using three 168-pin unbuffered DIMM
sockets.
l Supports a maximum memory size of 384MB (8M x 8) or 768MB (16M x 4)
registered DIMM only .
l Supports ECC(1-bit Error Code Correct) function.
l Supports only 3.3v SDRAM DIMM.
Slots
l One AGP(Accelerated Graphics Port) slot.
- AGP specification compliant
- AGP 66/133MHz 3.3v device support
l Four 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.
l Supports 3.3v/5v PCI bus Interface.
1-2
CHAPTER 1 INTRODUCTION
1-3
On-Board IDE
l An IDE controller on the Intel
®
82371EB PCI chipset provides IDE HDD/
CD-ROM with PIO, Bus Master and Ultra DMA/33 operation modes.
l Can connect up to four IDE devices.
On-Board Peripherals
l On-Board Peripherals include:
- 1 floppy port supports 2 FDD with 360K, 720K, 1.2M, 1.44M and
2.88Mbytes.
- 2 serial ports (COMA + COMB)
- 1 parallel port supports SPP/EPP/ECP mode
- 2 USB ports
- 1 IrDA connector for Fast IrDA. (reserved)
BIOS
l The mainboard BIOS provides “Plug & Play” BIOS which detects the
peripheral devices and expansion cards of the board automatically.
l The mainboard provides a Desktop Management Interface(DMI) function
which records your mainboard specifications.
l The 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.
System Hardware Monitor ( optional)
l CPU/Power Supply/Chassis Fan Revolution Detect
l CPU Fan Control (the fan will automatically stop when the system enters
suspend mode)
l System Voltage Detect
l CPU Overheat W arning (reserved)
l Chassis Intrusion Detect (reserved)
l Display Actual Current Voltage
RTC
l PIIX4(82371EB) built-in R TC.
CHAPTER 1 INTRODUCTION
1-4
Keyboard Connector
l PS/2
®
keyboard interface and PS/2® mouse interface.
Dimension
l A TX Form Factor: 30cm(L) x 18.6cm(W) x 4 layers PCB.
l Double deck I/O connectors, compatible with Intel
®
V enus Mainboard.
Mounting
l 6 mounting holes.
Other Features
l Keyboard Password Wake-Up.(reserved)
l LAN W ake-Up.
l Internal/External Modem W ake-Up.
l AC Power Loss Restore.
CHAPTER 1 INTRODUCTION
1.2 Mainboard Layout
FDD
IDE1
IDE2
DIMM 1
DIMM 2
DIMM 3
Top: mouse
Top: Port 1
USB
Bottom:
Port 2
Top: LPT
Bottom:
COM A
COM B
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® II processor . The mainboard
used a CPU Slot called Slot 1 for easy CPU installation. T o 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® II processor - Processor .
*Retention Mechanism(RM) - Plastic Guide that holds the S.E.C. Catridge
in the Slot 1 connector.
*Retention Mechanism Attach Mount(RMAM) - Bolt/Bridge assemblies
inserted up through the bottom of the
motherboard. RM secures to RMAM ( 2
RMAM required per RM ).
*Heat Sink 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
*Heat Sink Support Pin (HSSPIN) - Plastic pins inserted through the
HSSBASE to secure it to the mainboard (2
required per Assembly).
*Heat Sink Support T op 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
processor with 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
ê
ê
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 T wo holes across Slot 1, and match it with the Two legs
of the Heat Sink Support Base for the proper direction. T ake 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
S.E.C. Cartridge - Thermal
P
Isometric View
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
Heat Sink.
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
The arrow
should be
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.
è
ç
ç
è
CHAPTER 2 HARDWARE INSTALLATION
2-8
Step 8: Install the Heat Sink Support T op Bar .
Push the Heat Sink Support T op 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 a Boxed PentiumTM II
Processor, all you need is the Retention Mechanism.
SLOT1
Retention
Mechanism
ê
ê
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.
PC-3742
Retention
Mechanism
Notch
Hole
Heat Sink
Support Base
CHAPTER 2 HARDWARE INSTALLATION
2-11
PC-3743
Heat Sink
Support Lock
Intel® Boxed
Pentium® 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.
Heat Sink
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
PC-3745
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
SLOT1
Key
êê
Retention
Mechanism
Attach Mount
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.
C. OEM CeleronTM Processor Installation Procedures
Retention
Mechanism
ê
ê
Notch
Key
CHAPTER 2 HARDWARE INSTALLATION
2-15
Step 3: Install the Heat Sink to the Processor.
Push down the plastic clips, so that they are in line with the hole on
the processor . Check for perfect fit.
Step 4: Install the Processor .
Insert the Processor like inserting a PCI or an ISA card.
Step 5: Lock the Procesoor
Lock the processor by putting the Retention Cap provided. Take
note of the two plastic lock at the side of the Retention Cap. This
two plastic lock should be aligned properly into the Retention
Mechanism notch hole.
ê
ê
Retention Cap
ê
Heat Sink
Celeron
TM
processor
ê
plastic Clip
Plastic
Lock
Notch
Hole
Notch
Hole
CHAPTER 2 HARDWARE INSTALLATION
2-16
1 2 3 4 Core/Bus Ratio
ON OFF ON ON 2.5
ON ON OFF ON 3
ON OFF OFF ON 3.5
ON ON ON OFF 4
ON OFF O N 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 O N 7
OFF OFF OFF ON 7.5
OFF ON ON OFF 8
2.1-2 CPU Core Speed Derivation Procedure
1 . The DIP Switch SW1 (1, 2, 3, and 4) is used to set the Core/Bus (Fraction)
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 CPU Clock = 66MHz
Core/Bus ratio = 3. 5
then CPU core speed = Host Clock x Core/Bus ratio
= 66MHz x 3.5
= 233MHz
2 . The PCI Bus Clock is fixed at 33MHz.
SW1
CPU
Note: a. The CPU Bus Frequency is set at 66MHz or 100MHz by CPU
default.
b. If the mainboard support CPU Plug & Play, disregard this table
and go directly to BIOS Special Features Setup to set the CPU
speed.
CHAPTER 2 HARDWARE INSTALLATION
2-17
2.1-3 CPU Speed Setting
To adjust the speed of the CPU, you must know the specification of your
CPU (always ask the vendor for CPU specification).
Table 2.1 200 ~ 333MHz Intel® Pentium® II processor
233MHz
266MHz
300MHz
333MHz
200MHz
CPU
Type
SW1
ON
OFF
1 2 3 4
ON
DIP
ON
OFF
1 2 3 4
ON
DIP
ON
OFF
1 2 3 4
ON DIP
ON
OFF
1 2 3 4
ON DIP
ON
OFF
1 2 3 4
ON DIP
a. 66MHz CPU Bus Frequency
Table 2.2 350 ~ 450MHz Intel® Pentium® II processor
400MHz
450MHz
350MHz
CPU
Type
SW1
ON
OFF
1 2 3 4
ON DIP
ON
OFF
1 2 3 4
ON DIP
ON
OFF
1 2 3 4
ON DIP
b. 100MHz CPU Bus Frequency
CHAPTER 2 HARDWARE INSTALLATION
2-18
2.1-4 Fan Power Connectors: CPUFAN1/PSFAN1/SYSFAN1
These connectors support system cooling fan with +12V. It supports three
pin head connector. When connecting the wire to the connector, 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. If your
mainboard got Hardware Monitor chipset on-board, you must use a
specially designed fan with speed sensor to take advantage of that.
SYSFAN1
CPUFAN1
PSFAN1
Note: 1. CPUFAN1/SYSFAN1/PSFAN1 are the CPU, Power and Chassis
Cooling Fan Speed Connector (reserved for System Hardware
Monitor Option.)
2. Always consult vendor for proper CPU cooling fan.
For fans with fan speed sensor, every rotation of the fan will send out 2
pulses. System Hardware Monitor will count and report the fan rotation
speed.
SENSOR
+12V
GND
PSFAN1 : Power Supply Fan
CPUF AN1 : CPU Fan
SYSFAN1 : System(Chassis) Fan
SENSOR
+12V
GND
SENSOR
+12V
GND
CHAPTER 2 HARDWARE INSTALLATION
2-19
+12V
(default)
2.2 Flash ROM Programming Voltage: JMODE1
This jumper is for setting the voltage of the Flash ROM BIOS.
Voltage Setting
JMODE1
3
JMODE1
13
1
+12V PWD VCC
Note: a. Short 1-2 pin, if you’re using Intel® or MXIC flash memory and
you want to flash the ROM data.
b. Open JMODE1, if you’re using Winbond flash memory .
13
+12V PWD VCC
+5V
CHAPTER 2 HARDWARE INSTALLATION
2-20
2.3 Clear CMOS Jumper: JBAT1
A battery must be used to retain the mainboard configuration in CMOS
RAM. If you use the on-board battery , you must short 1-2 pins of JBAT 1
to keep the CMOS data.
Keep Data
Clear Data
1
3
Note: To short the CMOS data, turn off the system and unplug the power
cord for about 10 seconds afterwhich, move jumper cap from pin 1-2
to 2-3 and back to 1-2 pin position. A void clearing the CMOS while
the system is on; it will damage the mainboard.
JBA T1
1
3
2
1
32
CHAPTER 2 HARDWARE INSTALLATION
2-21
2.4 Memory Installation
2.4-1 Memory Bank Configuration
The mainboard supports a maximum of 384MB (8M x 8) or 768MB (16M x 4)
registered DIMM only . It provides three 168-pin unbuffered DIMMs
(Double In-Line Memory Module) sockets. It supports 8 MB to 256 Mbytes
DIMM memory module.
DIMM3(Bank4 + Bank5)
DIMM2(Bank2 + Bank3)
DIMM1(Bank0 + Bank1)
There are two kinds of DIMM specification supported
by this mainboard: PC100 and PC66. If you use
66MHz CPU Bus Frequency, these two DIMM Specs. is
supported. If you use 100 MHz CPU Bus Frequency,
only PC100 DIMM Specs. is supported.
!
W ARNING!
CHAPTER 2 HARDWARE INSTALLATION
2-22
A. How to install a DIMM Module
1. The DIMM slot has a two Notch Key “VOLT and DRAM”, so the
DIMM memory module can only fit in one direction.
2. Insert the DIMM memory module vertically into the DIMM slot.
Then push it in.
3. The plastic clip at the side of the DIMM slot will automatically
close.
Single Sided DIMM
Double Sided DIMM
Note: Y ou can only use a 3.3 volt DIMM module (SDRAM).
VOLTDRAM
2.4-2 Memory Installation Procedures
CHAPTER 2 HARDWARE INSTALLATION
2-23
1 . Supports SDRAM DIMM.
2. Supports unbuffered DIMM.
3 . T o operate properly , at least one 168-pin DIMM module must be
installed.
4. This mainboard supports T able Free memory , so memory can be installed
on DIMM1, DIMM2, or DIMM 3 in any order .
5. Supports 3.3 volt DIMM.
6. The DRAM addressing and the size supported by the mainboard is
shown next page.
2.4-3 Memory Population Rules
16M 1Mx16 ASYM 11 8 8MBx4 16MBx8
2Mx8 ASYM 11 9 16MBx8 32MBx16
4Mx4 ASYM 11 10 32MB 64MB
64M 2Mx32 ASYM 11 9 32MBx2 64MBx4
2Mx32 ASYM 12 8 16MBx2 32MBx4
4Mx16 ASYM 11 10 32MB 64MB
4Mx16 ASYM 13 8 32MB 64MB
8Mx8 ASYM 13 9 64MB 128MB
16Mx4 ASYM 13 10 128MB 256MB
64M 2Mx32 ASYM 12 8 16MB 32MB
4Mx16 ASYM 13 8 32MB 64MB
8Mx8 ASYM 13 9 64MB 128MB
16Mx4 ASYM 13 10 128MB 256MB
DRAM
Tech.
DRAM
Density &
Width
DRAM
Addressing
Address Size
MB/DIMM
Row
Column
Single
Side(S)
Double
Side(D)
no.
pcs.
no.
pcs.
T able 2.4-1 SDRAM Memory Addressing
CHAPTER 2 HARDWARE INSTALLATION
2-24
2.5 Case Connector: JFP1
The Power Switch, Reset Switch, Key Lock, Power LED, Speaker and HDD
LED are all connected to the JFP1 connector block.
JFP1
Power
Switch
Power
LED
+
Reset
Switch
HDD
LED
9
110
14
15
18
+
Keylock
Speaker
CHAPTER 2 HARDWARE INSTALLATION
2-25
2.5-1 Power Switch
Connect to a 2-pin push button switch. This switch had the same feature
with JRMS1.
2.5-2 Reset Switch
Reset switch is used to reboot the system rather than turning the power ON/
OFF . Avoid rebooting while the HDD LED is lit. Y ou can connect the Reset
switch from the system case to this pin.
2.5-3 Keylock
Keylock allows you to disable the keyboard for security purposes. You can
connect the keylock to this pin.
2.5-4 Power LED
The Power LED is always lit while the system power is on. You can connect
the Power LED from the system case to this pin.
2.5-5 Speaker
Speaker from the system case is connected to this pin.
If on-board speaker is available:
Short pin 14-15: On-board speaker Enabled.
Open pin 14-15: On-board speaker Disabled.
2.5-6 HDD LED
HDD LED shows the activity of a hard disk drive. A void turning the power
off while the HDD led is lit. You can connect the HDD LED from the system
case to this pin.
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