
TABLE OF CONTENTS
CHAPTER 1 INTRODUCTION.........................................1
1.1 OVERVIEW........................................................... 1
1.2 SYSTEM FEATURES...........................................1
1.3 SYSTEM SPECIFICATION...................................2
1.4 SYSTEM PERFORMANCE...................................2
1.5 EXP8C49 BOARD LAYOUT.................................3
CHAPTER 2 INSTALLATION..............................................................4
2.1 DRAM INSTALLATION.........................................4
2.2 SRAM INSTALLATION.........................................6
2.3 CPU INSTALLATION............................................8
2.4 OTHER JUMPER AND CONNECTOR
INSTALLATION.......................................................... 13
CHAPTER 3 SYSTEM BIOS SETUP.................................................16
3.1 SYSTEM SETUP................................................18
3.2 UTILITY............................................................... 30
3.3 DEFAULT............................................................ 35
APPENDIX..........................................................39
RMA FORM

EXP8C49 User’s Manual
CHAPTER 1
INTRODUCTION
1.1 OVERVIEW
The EXP8C49 is complemented by a 512KB second level Write-Back
cache providing workstation level computing performance, and SIMM
sockets support up to 64MB of DRAM.
The EXP8C49 motherboard offers outstanding I/O capabilities. Three
PCI Local Bus slots provide a high bandwidth data path for datamovement intensive function such as Graphics. Four ISA slots complete
the I/O mix.
The EXP8C49 motherboard provides the foundation for cost effective,
high performance, highly expandable platforms which deliver the latest in
CPU and I/O technologies.
1.2 SYSTEM FEATURES
q CYRIX, DX2, DX4, 5x86, QFP CPU
q Supports H/W GREEN/WAKE UP Switch
q Supports EDO DRAM
q Supports L1/L2 Write Back/Write Through Cache Feature
q Supports 3 MASTER PCI Bus
q Supports 128KB/256KB/512KB Cache Size
q Supports 72pin SIM MODULES
q Supports SMI/SMM/PMU/APM Power Controllers
q Enchanced PCI IDE on Board (Two Channels)
q Supports 2S1P, Floppy on Board
q BIOS has been Hardware Integrated with Enhanced IDE Driver
for Best Hard Disk Performance
q Supports Parallel Port EPP/ECP Mode
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EXP8C49 User’s Manual
1.3 SYSTEM SPECIFICATIONS
Processor: CYRIX CX486 DX2/DX4, 5x86 QFP CPU
CPU Clock: 25/33/40 MHz CPU
Memory: Up to 64MB
Memory Configuration: 1MB/2MB/4MB/8MB/16MB/32MB/64MB
SRAM Configuration: 128KB/256KB/512KB
BIOS Subsystem: AMI BIOS
I/O Subsystem No. Slot: Four 16-bit ISA Bus and three PCI Bus
Dimension: 22cm x 22cm, 1/2 Baby AT Size
Additional Features
Miscellaneous Connectors: Reset Button, Internal Battery, Turbo
SW, Flash LED(Turbo LED) for Power
Green
Board Design: Four-layer Implementation for Low Noise
Operation
1.4 SYSTEM PERFORMANCE
SOFTWARE
CPU TYPE LANDMARK
V2.0
POWER
METER
V1.8 MIPS
NORTON
V8.0
CPU SPEED
CYRIX 486 DX4 100MHz
328.33MHz 28.4MIPS 169.0
CYRIX 5x86 -
100MHz
420.95MHz 35.5MIPS 262.7
CYRIX 5x86 -
120MHz
507.41MHz 43.1MIPS 316.7
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EXP8C49 User’s Manual
CHAPTER 2
INSTALLATION
Before the system is ready to operate, the hardware must be set up for
various functions of the system. To set up the EXP8C49 motherboard is
a simple task. The user only has to set a few jumpers, connectors and
sockets.
2.1 DRAM INSTALLATION
The EXP8C49 main board can support expanded memory from 1MB to
64MB. Either 1MB, 2MB, 4MB, 8MB,16MB, 32MB, SIM Modules can be
used on the EXP8C49 motherboard.
n The board layout below shows the locations of the DRAM
memory banks :
5
SM1 SM2 SM3
SM4
SM1
SM4
SM2
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EXP8C49 User’s Manual
. The motherboard consists of four memory
banks, SM1, SM2, SM3 or SM4 .
n TABLE 1
SM1 SM2 SM3 SM4
TOTAL
MEMORY
4MB None None None 4MB
4MB 4MB None None 8MB
4MB 4MB 4MB None 12MB
8MB 4MB None None 12MB
8MB 8MB None None 16MB
16MB None None None 16MB
16MB 4MB None None 20MB
16MB 4MB 4MB None 24MB
16MB 4MB 4MB 4MB 28MB
16MB 16MB None None 32MB
16MB 16MB 4MB None 36MB
16MB 16MB 4MB 4MB 40MB
16MB 16MB 16MB None 48MB
16MB 16MB 16MB 4MB 52MB
16MB 16MB 16MB 16MB 64MB
32MB 32MB None None 64MB
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EXP8C49 User’s Manual
J 40MHz (OR) 40MHz
NOTICE:
The PCI clock specification should be under 33MHz. (Including 33MHz) If you encounter
an unstable problem when you use the default setting, we suggest you to choose another
setting for PCI clock.
J Default Setting
13
l
l
J P1
2
J P1
1
J P1
6
J P1
3
l
l
J P1
2
3
2
1
J P1
1
J P1
6
J P1
3
l
l
J P1
2
J P1
1
J P1
6
J P1
3
l
l
l
l
l
l
J P1
2
J P1
1
J P1
6
J P1
3
l
l
l
l
l
l
3
2
1
3
2
1
3
2
1
6
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EXP8C49 User’s Manual
JUMP
ER
DESCRIPTION
JP5
EPP & ECP Function
1-2 DRQ1 2-3 DRQ3
JP6
EPP & ECP Function
1-2 DACK1 2-3 DACK 3
JP9
Printer Port
1-2 for IRQ 5 2-3 for IRQ 7
JP15
External Stop Buttom
JP21
1-2 for 5V Flash Rom 2-3 for 12 V Flash Rom
CONNECTOR DESCRIPTION
CONNEC
TOR
PIN OUT SIGNAL NAME
J1
1-2 Clear CMOS
2-3 For Normal
1-4 External Battery Connector
(1: Ground)
(4: External Battery Power In)
J2
On Board IDE
LED
J3 :
1
2
Ground
Reset In
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1 2 3 4

EXP8C49 User’s Manual
RESET
J4 :
TB-LED
1
2
+Anode
-Cathode
J5 :
TURBO
SWITCH
J6 :
KEY
LOCK
1
2
3
4
5
Power LED
Not Used
Ground
Keyboard Inhibitor
Ground
J7 :
SPEAKER
1
2
3
4
+5V DC
Data Out
Data Out
Data Out
KB1:
KEYBOAR
D
CONNECT
OR
1
2
3
4
5
Keyboard Clock
Keyboard-Data
Space
Ground
+5V
P1 & P2 :
POWER
CONNECT
OR
1
2
3
4
5,6,7,8
9
10,11,12
Power Good
+5V DC
+12V DC
-12V DC
Ground
-5V DC
+5V DC
IDE1,
IDE2
On Board IDE
Connector
FDC1
Floppy Connector
PRN1
Printer Connector
J Default Setting
CHAPTER 3
SYSTEM BIOS SETUP
18
l
l
Turbo Speed
Normal
Speed
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EXP8C49 User’s Manual
WinBIOS Setup can be accessed via keyboard, mouse, or pen. The
mouse click functions are:
· single click to change or select both global and current fields and
· double click to perform an operation in the selected field.
Using the keyboard with WinBIOS Setup
WinBIOS Setup has a built-in keyboard driver that uses simple keystroke
combinations:
KEYSTRO
KE
FUNCTION
<Tab> Move to the next window or field.
à, ß, á, â Move to the next field to the right, left, above, or below.
<Enter> Select in the current field.
+ Increments a value.
- Decrements a value.
<Esc> Closes the current operation and return to previous level.
<PgUp> Returns to the previous page.
<PgDn> Advances to the next page.
<Home> Returns to the beginning of the text.
<End> Advances to the end of the text.
<Alt>, <H> Access a help window.
<Alt><Spacebar> Exit WinBIOS Setup.
Alphabetic Keys A to Z are used in the Virtual Keyboard, and are not case
sensitive.
Numeric Keys 0 to 9 are used in the Virtual Keyboard and Numeric
Keypad.
The hardware features and options of the EXP8C49 are on-site
selectable for maximum flexibility. You will need to configure these
options through the built-in Setup Utility prior to using EXP8C49 for the
first time. This setup Utility is a multi-screen, menu driven program and
is contained within the BIOS EPROM.
The following sections show the procedures that you may need to
configure the EXP8C49:
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EXP8C49 User’s Manual
1. Press <DEL> while turning on or rebooting the system to invoke
Setup Utility program.
2. The main menu will be shown as follows:
Figure 1
3. The functions are grouped into four categories which are Setup,
Utility, Security and Default.
4. By using <TAB> key or mouse cursor to select the function group.
5. Use arrow keys or mouse to select the function icon within the
group. Then press <Enter> key to invoke the setup function.
6. Use <Esc> Key to go back to the previous screen.
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EXP8C49 User’s Manual
3.1 SYSTEM SETUP
There are five icons in the Setup Group.
Selecting Standard icon displays the following menu:
Figure 2
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EXP8C49 User’s Manual
Selecting Date/Time icon displays the following menu:
Figure 3
After entering correct date and time, press <Esc> to go back to the
previous menu.
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EXP8C49 User’s Manual
Selecting Floppy A/B icon displays the flowing menu:
Figure 4
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EXP8C49 User’s Manual
Using arrow keys or mouse to select the correct specification of floppy
drive. Press <Esc> key to go back to the previous menu.
Figure 5
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EXP8C49 User’s Manual
Selecting Master/Slave Disk icon displays the following menu:
Figure 6
Use arrow keys or mouse to select or enter the Master Hard Disk
specifications.
Press <Esc> to go back to the previous menu.
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EXP8C49 User’s Manual
Selecting Slave Disk icon displays the following menu:
Figure 7
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EXP8C49 User’s Manual
Selecting Advance icon displays the following menu:
Use arrow keys to select the desired entries and make changes. Press
<Esc> key to go back to the previous menu.
Figure 8
Figure 9
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EXP8C49 User’s Manual
Selecting Chipset icon displays the following menu:
Figure 12
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EXP8C49 User’s Manual
Figure 13
NOTE:
1. Byte merge:
This feature is used to merge byte or word to double word. Since PCI
is a 32-bit bus.
2. Fast Back to Back:
This feature is used to enable PCI fast-back-to-back cycle defined in
PCI specification.
But in our tests, not every PCI VGA card can accept these features
correctly, we suggest this feature programmed as an option in CMOS
setup.
CX5x86 Linear Wrapped Mode: For Linear Burst Mode of
5X86 (M1sc) CPU.
NOTE:
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EXP8C49 User’s Manual
Many entries on the screen are defined in PCI specification.
Unless you truely understand the meaning of these entries,
please DO NOT try to change the settings. For more detailed
information, refer to the PCI specification.
Figure 14
Figure 15
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EXP8C49 User’s Manual
3.2 UTILITY
The following icons appear in this section:
IDE SETUP If drive C: or D: is an IDE drive, the hard disk drive
parameters for drive C: or D: are automatically detected and
reported to the Hard Disk Drive C: or D: screen in Standard
Setup, so you can easily configure drive C: or D:.
Color Set Set the WinBIOS Setup screen colors.
Language Permits you to select a foreign language-specific screen
character set.
Figure 17
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EXP8C49 User’s Manual
Figure 18
Use arrow key to select the desired entries and make changes, press
<Esc> key to go back to the previous menu.
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EXP8C49 User’s Manual
WinBios Setup has an optional password feature. The system can be
configured so that all users must enter a password every time the
system boots or when WinBIOS Setup is executed. The following screen
appears when you select the password icon.
Figure 19
You can enter a password by:
· typing the password on the keyboard,
· selecting each letter via the mouse, or
· selecting each letter via the pan stylus.
Pen access must be customized for each specific hardware platform.
The password check option is enabled in Advanced Setup by choosing
either Always (the password prompt appears every time the system is
powered on) or Setup (the password prompt appears only when
WinBIOS Setup is run). The password is stored in CMOS RAM. The
system asks for a password.
Enter a 1-6 character password. The password does not appear on the
screen when typed. WinBIOS will ask you to retype the password. Make
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EXP8C49 User’s Manual
sure you write it down. If you forget it, you must drain CMOS RAM and
reconfigure the system. WinBIOS will then display the following:
Figure 20
Select the Password icon from the Security section of the WinBios Setup
main menu. Enter the password and press <Enter>. The screen does not
display the characters entered. After the new password is entered,
retype the new password as prompted and press <Enter>.
If the password confirmation is incorrect, an error message appears. If
the new password is entered without error, press <Esc> to return to the
WinBIOS Setup Main Menu. The password is stored in CMOS RAM after
WinBIOS Setup completes. The next time the system boots, you are
prompted for the password if the password function is present and is
enabled.
Remember the Password
Keep a record of the new password when the password is changed. If
you forget the password and your computer has an American
Megatrends motherboard, remove the computer cover, set switch 1-2
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EXP8C49 User’s Manual
(the DIAG switch) to ON, power on the computer. WinBIOS erases the
password.
When this icon is selected from the Security section of the WinBIOS
Setup main menu, WinBIOS issues a warning when any program (or
virus) issues a Disk Format command or attempts to write to the boot
sector of the hard disk drive. The following screen appears when you
select the Anti-Virus icon:
Figure 21
The setting are Enabled or Disabled. If enabled, the following appears
when a write is attempted to the boot sector. You may have to type N
several times to prevent the boot sector write.
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EXP8C49 User’s Manual
3.3 DEFAULT
The icons in this section permit you to select a group of settings for all
WinBIOS Setup options. Not only can you use these icons to quickly set
system configuration parameters, you can choose a group of settings
that have a better chance of working when the system is having
configuration-related problems.
Original
Choose the Original icon to return to the system configuration values
present in WinBIOS Setup when you first began this WinBIOS Setup
session.
Optimal
You can load the optimal default settings for the WinBIOS Setup options
by selecting the Optimal icon. The Optimal default settings are bestcase values that should optimize system performance. If CMOS RAM is
corrupted, the Optimal settings are loaded automatically.
Fail-Safe
You can load the Fail-Safe WinBIOS Setup option settings by selecting
the Fail-Safe icon from the Default section of the WinBIOS Setup main
menu.
The Fail-Safe settings provide far from optimal system performance, but
are the most stable settings. Use this option as a diagnostic aid if the
system is behaving erratically.
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EXP8C49 User’s Manual
WINBIOS BEEP CODES
BEEPS ERROR MESSAGE DESCRIPTION
1
Refresh Failure The memory refresh circuitry is
faulty.
2
Parity error Parity error in the base memory
(the first 64 KB block) of
memory.
3
Base 64 KB Memory Failure Memory failure in first 64 KB.
4
Timer Not Operational A memory failure in the first 64
KB of memory, or Timer is not
functioning.
5
Processor error The CPU generated an error.
6
8042-Gate A20 Failure Cannot switch to protected mode.
7
Processor exception Interrupt
Error
The CPU on the CPU Card
generated an exception interrupt.
8
Display Memory Read/Write
Error
The system video adapter is
either missing or its memory is
faulty. This is not a fatal error.
9
ROM Checksum Error The ROM checksum value does
not match the value encoded in
WinBIOS.
10
CMOS Shutdown Register
Read/Write Error
The shutdown register for CMOS
RAM has failed.
11
Cache memory bad - do not
enable cache
The cache memory test failed.
Cache memory is disabled. Do
not press <Ctrl> <Alt> <+> to
enable cache memory.
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EXP8C49 User’s Manual
What to Do If the Computer Beeps
Here is what you need to do if your computer has a WinBIOS and it starts
beeping:
IF THE SYSTEM
BEEPS...
THEM...
1, 2, or 3 times...
reseat the memory SIMMs or DIPs. If the system still
beeps, replace the memory.
6 times...
reseat the keyboard controller chip. If it still beeps,
replace the keyboard controller. If it still beeps, try a
different keyboard, or replace the keyboard fuse, if the
keyboard has one.
8 times...
there is a memory error on the video adapter. Replace
the video adapter, or the RAM on the video adapter.
9 times...
the BIOS ROM chip is bad. The system probably needs a
new BIOS ROM chip.
11 times...
reseat the cache memory on the motherboard. If it still
beeps, replace the cache memory.
4, 5, 7, or 10 times... the motherboard must be replaced.
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EXP8C49 User’s Manual
APPENDIX
AUTO CONFIG FUNCTION: (On Figure 12)
This option when set “Enabled” will automatically set the AT-bus clock,
DRAM Read/Write Timing and SRAM Read/Write Timing according to the
CPU configuration default table.
PROGRAMMING MODE: (On Figure 16)
The settings are “Auto” or “Manual”. When set to “Auto”, the WINBIOS
automatically detects all adapter cards installed in the system and configures the
on-board serial ports, parallel ports, Floppy controller and IDE controller
automatically. Default setting is set as “Enabled”.
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RMA FORM
When the motherboard can not work well, please fill up this form to
describe related situations. If the space is not enough to use, you can
attach separate paper.
MODEL: MODEL NO:
HARDWARE
CPU: Brand ______________ , Model _____________, Speed
______________ MHz
CO-PROCESSOR: Brand ____________, Model ____________, Speed
__________ MHz
SIMM: Brand _________, Speed _________ ns, Q'ty ________ pcs, Total
_________ MB
CACHE: Brand ____________, Speed ___________ ns, Total
____________K
TAG RAM: Brand ____________, Speed ___________ns
BIOS DATE CODE: ___________
SYSTEM SPEED RUNNING ___________ MHz
VIDEO CARD: Chip ___________, RAM ___________, VGA Mode
___________
Bus___________(ISA, VESA or PCI)
OTHER ADD-ON CARDS:
SOFTWARE
OPERATING SYSTEM _______________________ VERSION
_____________________
SOFTWARE PROGRAM
__________________________________________________
BIOS SETUP: DRAM Wait State_________________ CACHE Wait
State_______________
If you change BIOS SETUP, please describe the changes:
<A> ERROR
¨ HANG UP ¨ NO SCREEN ¨ FLOPPY R/W
ERROR

¨ HARD DISK R/W ERROR ¨ PARITY
MEMORY ERROR
¨ OTHER
____________________________________________________
<B> ERROR MESSAGES ON YOUR SCREEN (PLEASE SHOW US THE
WHOLE SENTENCE)
<C> PROBLEM DESCRIPTION