DataExpert EXP8C49 User Manual

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EXP8C49
User’s Manual
(Date 8/11/95
Page 2
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
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
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EXP8C49 Users 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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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
2
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1.5 EXP8C49 BOARD LAYOUT
1
3
SM1 SM2 SM3
SM4
KEYBO ARD
B T 1
CO M1
CO M2
M1489 A1
CPU
J P 1 5
1 5
1 4
J P 39
J P 40
P 1
P 2
1 2
1 2
25 26
40 39
FDC1PR
N1
M1487 A1
W83
768
W837
87
1 4
J P 12
PCI
2
P
CI
3
PCI
1
J 1
2
1
9
1
0
2
1
9
1 0
MOUS
E
3
J P 4 1
1
1
1
3
3
J P 5
J P 6
¯
J P 4
J P 9
J P 11
3
1
J P 13
J P 1 6
J P 1 8
J P 1 9
3
1
J P 21
J P 17
U 1 7
U 1 6
U 1 5
U 1 4
1 25 6
J P 29
J P 37
U
22
U 1 3
1 2
40 39
ID
E1IDE2
1 2
40 39
27 01
0
8042
J P 42
3
1
J P 2
0
3
1
U 1
2 J P 23
3
1
J P 32
3
1
J P 24
1
3
J P 35
4 3 2 1
BAN K 1
BAN K 0
BAN K 0
3
1
U
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4
RES ET
J 3
SP K
KEYL OCK
J 3
RES ET
J 4
T/ LE D
J 5
T/ S W
6
6
HDDL
ED
J 7
J 6
J 2
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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
SM3
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. 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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2.2 SRAM INSTALLATION
CACHE CONFIGURATION SIZE
128K
TAG
RAM
DATA
RAM
U10
8KX8
U14-U17
32KX8
7
J P2 0
J P1 7
J P4 2
J P3 7
l
l
1 2 3
M1489 A1
SP K
KEYL OCK
CPU
J P 1 5
J 3
RES ET
J 4
T/ LE D
J 5
T/ S W
1 5
1 4
J P 39
J P 40
M1487 A1
J P 1 6
J P 1 8
J P 1 9
3
1
J P 21
J P 17
U 1 7
U 1 6
U 1 5
U 1 4
1 25 6
J P 29
J P 37
U
22
U 1 3
27 01
0
J P 42
3
1
HDDL
ED
J P 2
0
J 7
J 6
U 1 2
J P 23
3
1
J P 32
3
1
J 2
J P 24
1
3
J P 35
4 3 2 1
3
1
3 2 1
l l
U
10
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or
128K
TAG
RAM
DATA
RAM
U10
8KX8
U13
32KX32
256K
TAG
RAM
DATA
RAM
U10
16KX8,
32KX8
U14-U17
64KX8
or
256K
TAG
RAM
DATA
RAM
U10
16KX8,
32KX8
U14-U17
32KX8
U22
32KX32
or
J 256K
TAG
RAM
DATA
RAM
8
J P2 0
J P 17
J P4 2
J P3 7
l
l1 2
3
J P2 0
J P1 7
J P4 2
J P3 7
J P2 0
J P1 7
J P4 2
J P3 7
J P2 0
J P1 7
J P4 2
J P3 7
1 2 3
l
l
l
l
l
l
1 2 3
l
l
6
l
l
6
l
l
3 2 1
l l
3 2 1
l l
3 2 1
l l
3 2 1
l l
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U10
16KX8,
32KX8
U13, U22
32KX32
512K
TAG
RAM
DATA
RAM
U10
32KX8
U14-U17
128KX8
J Default Setting
9
J P 20
J P 17
J P4 2
J P3 7
l l
l
l
1 2 3
1 2 3
l
l
3 2 1
l l
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2.3 CPU INSTALLATION
CYRIX 5x86 (MISC)
10
J P 32
J P 35
J P
23
l l
M1489 A1
SP K
KEYL OCK
CPU
J P 1 5
J 3
RES ET
J 4
T/ LE D
J 5
T/ S W
1 5
1 4
J P 39
J P 40
M1487 A1
J P 1 6
J P 1 8
J P 1 9
3
1
J P 21
J P 17
U 1 7
U 1 6
U 1 5
U 1 4
1 25 6
J P 29
J P 37
U
22
U 1 3
27 01
0
J P 42
3
1
HDDL
ED
J P 2
0
J 7
J 6
U 1 2
J P 23
3
1
J P 32
3
1
J 2
J P 24
1
3
J P 35
4 3 2 1
l l
l l
4 2
3 1
3 2 1
3 2 1
U
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CYRIX 486DX2/DX4
11
M1489 A1
SP K
KEYL OCK
CPU
J P 1 5
J 3
RES ET
J 4
T/ LE D
J 5
T/ S W
1 5
1 4
J P 39
J P 40
M1487 A1
J P 1 6
J P 1 8
J P 1 9
3
1
J P 21
J P 17
U 1 7
U 1 6
U 1 5
U 1 4
6
1 2
6
5 6
J P 29
J P 37
U
22
U 1 3
27 01
0
J P 42
3
1
HDDL
ED
J P 2
0
J 7
J 6
U 1 2
J P 23
3
1
J P 32
3
1
J 2
J P 24
1
3
J P 35
4 3 2 1
J P 32
J P 35
J P 23
l l
l l
4 2
3 1
3 2 1
3 2 1
l
l
3
1
U
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FREQUENCY SETTING
25MHz 33MHz
12
6
6
M1489 A1
SP K
KEYL OCK
CPU
J P 1 5
J 3
RES ET
J 4
T/ LE D
J 5
T/ S W
1 5
1 4
J P 39
J P 40
M1487 A1
J P 12
PCI
2
PCI
1
3
J P 4 1
1
J P 11
3
1
J P 13
J P 1 6
J P 1 8
J P 1 9
3
1
J P 21
J P 17
U 1 7
U 1 6
U 1 5
U 1 4
1 25 6
J P 29
J P 37
U
22
U 1 3
1 2
40 39
ID
E1IDE2
1 2
40 39
27 01
0
J P 42
3
1
HDDL
ED
J P 2
0
J 7
J 6
U 1 2
J P 23
3
1
J P 32
3
1
J 2
J P 24
1
3
J P 35
4 3 2 1
3
1
U
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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
6
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CPU POWER VOLTAGE
J 3.45V 3.6V 3.3V
14
M1489 A1
SP K
KEYL OCK
CPU
J P 1 5
J 3
RES ET
J 4
T/ LE D
J 5
T/ S W
1 5
1 4
J P 39
J P 40
M1487 A1
J P 1 6
J P 1 8
J P 1 9
3
1
J P 21
J P 17
U 1 7
U 1 6
U 1 5
U 1 4
1 25 6
J P 29
J P 37
U
22
U 1 3
27 01
0
J P 42
3
1
HDDL
ED
J P 2
0
J 7
J 6
U 1 2
J P 23
3
1
J P 32
3
1
J 2
J P 24
1
3
J P 35
4 3 2 1
3
1
U
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J Default Setting
2.4 OTHER JUMPER SETTING
15
l l l
l
5 3 1
5 3 1
J P29J P 29
6 4 2
6 4 2
l
l
5 3 1
J P 29
6 4 2
l
l
5 3 1
J P 29
6 4 2
KEYBO ARD
B T 1
CO M1
CO M2
6
6
SP K
KEYL OCK
J P 1 5
J 3
RES ET
J 4
T/ LE D
J 5
T/ S W
1 5
1 4
J P 39
J P 40
P 1
P 2
M1487 A1
W83
768
W837
87
1 4
J P 12
J 1
2
1
9
1 0
2
1
9
1 0
MOUS
E
3
J P 4 1
1
1
1
3
3
J P 5
J P 6
¯
J P 4
J P 9
J P 11
3
1
J P 13
J P 1 6
J P 1 8
J P 1 9
3
1
J P 21
27 01
0
8042
J P 42
3
1
HDDL
ED
J P 2
0
J 7
J 6
3
1
J 2
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INTERNALKEYBOARD CONTROL
JP19 JP39 JP40
J ENABLE
DISABLE
J Default Setting
OTHER JUMPER DESCRIPTION
16
RES ET
J 3
l
l
l
l
l
l
U
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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
17
1 2 3 4
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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
J
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EXP8C49 Users 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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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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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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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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Selecting Floppy A/B icon displays the flowing menu:
Figure 4
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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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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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Selecting Slave Disk icon displays the following menu:
Figure 7
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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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Figure 10
Figure 11
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Selecting Chipset icon displays the following menu:
Figure 12
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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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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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Figure 16
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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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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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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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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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(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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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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Figure 22
Figure 23
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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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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 Users 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
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¨ HARD DISK R/W ERROR ¨ PARITY MEMORY ERROR ¨ OTHER ____________________________________________________
<B> ERROR MESSAGES ON YOUR SCREEN (PLEASE SHOW US THE WHOLE SENTENCE)
<C> PROBLEM DESCRIPTION
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