TYAN TOMAHAWK BX User manual

Tyan S1856
Tomahawk BX/A+
Motherboard User’s Manual
Revision 1.00
Copyright © Tyan Computer Corporation, 1999. All rights reserved. No part of this
manual may be reproduced or translated without prior written consent from Tyan
Computer Corp.
All registered and unregistered trademarks and company names contained in this
manual are propery of their respective companies including, but not limited to the
following.
AMIBIOS is a trademark of American Megatrend Incorporated.
Award is a trademark of Phoenix Technologies Ltd.
Windows is a trademark of Microsoft Corporation.
IBM, PC, AT, PS/2 are trademarks of IBM Corporation.
INTEL, Pentium II, Celeron are trademarks of Intel Corporation.
S1856 Tomahawk BX and Tomahawk A+ are trademarks of TYAN Computer
Corporation.
Information contained in this publication has been carefully checked for accuracy and
reliability. In no event will Tyan Computer be held liable for any direct or indirect,
incidental or consequential damage, loss of use, loss of data, or other malady resulting
from errors or inaccuracies of information contained in this manual. The information
contained in this document is subject to change without notice.
PRINTEDINUSA.

Tableof Contents
1.Introduction................................................................................................. 4
Overview........................................................................................... 4
Icons................................................................................................. 5
HardwareSpecifications/Features................................................ 5
SoftwareSpecifications.................................................................. 7
TechnicalSupport........................................................................... 7
ReturningMerchandiseforService............................................. 8
2.BoardInstallation..................................................................................... 10
Unpacking....................................................................................... 10
Installation...................................................................................... 10
QuickReferenceforJumpers........................................................ 12
Mapof MotherboardJumpers..................................................... 13
ClearCMOS& ResetPassword.................................................. 17
SoftPowerConnector.................................................................... 17
HardwareReset Switch Connector Installation......................... 18
EnsoniqAudioConnectors ......................................................... 18
ExternalSMI.................................................................................... 18
ChassisIntrusionAlarm Connector............................................ 18
CMOSRTC...................................................................................... 18
FlashEEPROM............................................................................... 18
Mounting the Motherboard in the Chassis .............................. 19
InstallingMemory.......................................................................... 19
CacheMemory................................................................................ 23
Installingthe CPUand CoolingFan........................................... 23
ConnectingIDE andFloppy Drives.............................................24
ConnectingthePower Supply...................................................... 27
InstallingAddonCards ............................................................... 28
ConnectingPS/2, USB, Serial and Parallel Devices.............. 28
FrequentlyAskedQuestions....................................................... 30
3.BIOSConfiguration................................................................................. 32
MainSetupMenu.......................................................................... 35
BIOSFeaturesSetup...................................................................... 40
ChipsetFeaturesSetup................................................................. 45
PowerManagementSetup............................................................ 48
PnP/PCIConfiguration................................................................ 53
IntegratePeripherals...................................................................... 56

UserPassword................................................................................ 58
FlashWriterUtility......................................................................... 59
4.SystemResources.................................................................................... 62
BeepCodes..................................................................................... 62
TroubleshootingSystem Problems............................................. 63
DisplayedErrorMessages.......................................................... 71
Appendix1-CPURetentionModuleOptions.......................................... 74
Appendix2-Glossary.................................................................................. 76

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4
Chapter 1
Introduction
Overview
TheS1856 (S1856STomahawk BX, and S1856S-VTomahawkA+)is aquality,
high performance motherboard designed for Socket 370 Intel Celeron micropro-
cessors.TheTomahawk BX utilizes the Intel 440BXAGPset withAMI BIOS.
The TomahawkA+ uses the VIAApollo Pro PlusAGPset with Award BIOS.
Both boards can support Celeron CPU speeds of 300MHz through 400MHz,
and host bus speeds of 66MHz to 100MHz.
The S1846 motherboard, with built-in AGP slot, provides high performance
capabilities that are ideal for a wide range of demanding applications such as
CAD, CAM, CAE, desktop publishing, 3D animation, and video production.
This system board in anATX form factor offers far more features and
expandability than MicroATX models. Some of the features included are
onboard dual channel PCI PIO, Bus Master IDE and UltraDMA/33, onboard
floppy controller, and onboard high speed I/O.
Flexibility and expandability have been designed into theTomahawk BX/A+.
With I/O and drive controller support built onboard, the oneAGP slot, five PCI
and two ISA slots (one shared, seven usable) are free for numerous add-on
expansion cards.
chapter 1
Introduction

S1856 TomahawkBX/A+
5
INTRO
Remember to take a look atTYAN Computer’s web site located at
http://www.tyan.com.There you can find information on all ofTYAN’s
products along with FAQs, distributors list, drivers, and BIOS setting explana-
tions.
Icons
In order to help you navigate this manual and set up your system, we have
added several icons to our format.
This icon alerts you to particularly important details regarding the
setup or maintenance of your system. This icon often appears next
to information that may keep you from damaging your board or
system. While we will often point out the most vital paragraphs in a chapter,
you should always read every word in the text. Failing to do so can lead to
exasperation and expense.
Wherever possible, we have included step-by-step instructions for
setting up your system, which are indicated by this icon. However, it
is in your best interest to read an entire section (and perhaps the
entire manual) before you begin to fiddle with your motherboard.
While we have alerted you to potential dangers in several places in
the manual with this icon, these warnings should not be regarded as
the whole of your safety regimen. Never forget that computers are
electrical devices, and are capable of delivering a shock. Prevent damage to
yourself and to your board: always ensure that your system is turned off and
unplugged whenever you are working with it, and that you are equipped with a
static safety device.
HardwareSpecifications/Features
ProcessorInformation •One Socket 370 CPU connector
•66MHz to 100MHz bus support
(BIOSselectable)
•Celeron300to500MHz
!!!!!
important!
procedure
1.
2.
3.
warning

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6
Chapter 1
Introduction
ChipsetInformation •Intel440BXAGPsetwithPIIX4e(S1856S)
•ViaApolloProPlus:82C596A+82C692
(S1856S-V)
•Winbond ‘977 Super I/O chipset
VoltageandPower •ATX power supply connector
Information •+12Vpower source for DC fan onboard
•3.3VDRAM support
•Utilizes GTL+ bus to reduce power
consumption and EMI
MainMemory •Up to 768MB onboard*
•Three 168-pin DIMM sockets
•Supports100MHz SDRAM withSPD
SystemManagement •Optional Analog Devices ADM9240 ASICs
with onboard alarm for monitoring temperature,
supply voltages, and fan speed
•Intel LANDesk Client Manager software optn
•Chassis intrusion detection capable
ExpansionSlots •One 32-bit AGP slot
•Five 32-bit PCI Bus Master slots
•Two 16-bit ISAslots
•One shared, seven usable slots
PhysicalDimensions •ATX design
•12inches x 8.2 inches
•S1856requires IntelVenus
compatible I/O shield
•S1856SLA(with sound) requires Intel Cave
man compatible I/O shield
BIOSInformation •AMI Plug and Playflash BIOS (S1856S)
•Award Plugand Playflash BIOS (S1856S-V)
•DeepGreen, EnergyStar,ACPI,Year 2000, and
PC98compliant
•Soft power-down, multiple boot options
•Win98/NT5ready,DMI 2.0 compliant
•PCI2.1,APM 1.1compliant

S1856 Tomahawk BX/A+
7
INTRO
DiskDrive&SystemI/O •Two PCI bus mastering EIDE channels
•SupportsEIDECD-ROMs
•PIO Mode 3 & 4 (up to 17MB/sec DTR)
•UltraDMA/33 bus mastering mode (up to
33MB/secDTR)
•Support for two floppy drives (up to 2.88MB)
•Two serialports (16550 UARTs)
•OneECP/EPPparallel port
•OneIR (InfraRed) I/O interface port
•Two USB rev 1.2 (universal serial bus)
connectors
•One PS/2 mouse port
•One PS/2 keyboard port
•OneAnalog Video Out port
EnsoniqES1373PCIAudio •AC97Codec
(S1856SLAonly) •Uses a single, shared IRQ
•High performance PCI bus master
•Spatial enhanced 3D sound (SWS)
•Wavetable synthesis built in
•Joystick,Audio in, Speaker, Microphone
connectors
* Only 384MB validated at time of print.
SoftwareSpecifications
OS •Operateswith MS-DOS,Windows3.x,
Windows forWorkGroup 3.x, Windows 95,
Windows 98, Windows NT, OS/2, Novell
Netware,Solaris, andSCO Unix
TechnicalSupport
If a problem arises with your system, you should turn to your dealer for help
first. Your system has most likely been configured by them, and they should
have the best idea of what hardware and software your system contains.
Hence, they should be of the most assistance. Further, if you purchased your
system from a dealer near you, you can actually bring your system in to them
to have it serviced, instead of attempting to do so yourself (which can have

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8
Chapter 1
Introduction
expensive consequences).
Helpresources:
1. See FAQ and beep codes sections of this manual.
2. See Tyan web site for FAQ, bulletins, driver updates, etc.
http://www.tyan.com
3. Contact your dealer or distributor for help BEFORE callingTyan.
4. Check the Tyan user group: alt.comp.periphs.mainboard.tyan
6. Call Tyan tech support: 510-440-8808
ReturningMerchandiseforService
During the warranty period, contact your distributor or system vendor FIRST
for any product problems. This warranty only covers normal customer use and
does not cover damages incurred during shipping or failure due to the
alteration, misuse, abuse, or improper maintenance of products.
ForResellersOnly:
A receipt or copy of your invoice marked with the date of purchase is required
before any warranty service can be rendered. You can obtain service by calling
the manufacturer for a Return MerchandiseAuthorization (RMA) number. The
RMA number should be prominently displayed on the outside of the shipping
carton and the package should be mailed prepaid, or hand-carried to the
manufacturer. TYAN will pay to have the board shipped back to you.

S1856 Tomahawk BX/A+
9
INTRO
Thispageleftblankintentionally.

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10
Chapter 2
Board Installation
chapter 2
Board Installation
Unpacking
The motherboard package should contain the following:
(1) S1856mainboard
(1) 40-pin IDE and 34-pin floppy cable pack
(1) S1856User’sManual
(1) Driverdisk
Installation
You are now ready to install your motherboard. The mounting hole pattern of
the S1856 matches the ATX system board specifications. Your chassis should
support a standardATX mainboard form factor.
How to install our products right...the first time.
What’sthe firstthingI shoulddo?
The first thing you should do is read this user’s manual. It contains important
information which will make configuration and setup much easier.
Here are some precautions you should follow when installing your mother-
board:

S1856 Tomahawk BX/A+
11
procedure
1.
2.
3.
INSTALL
(1) Groundyourselfproperlybeforeremovingyourmotherboard
fromthe antistatic bag. Unplug the power from your computer
and then touch any metal part on the computer case. (Or wear a
grounded wrist strap.)
(2) Holdthemotherboardbyitsedgesanddonottouchthebottomof
theboard.
(3) Avoidtouchingmotherboardcomponents,ICchips,connectors,
andleads.
(4) Avoidtouchingpinsofmemorymodulesandchips.
(5) Placemotherboardonagroundedantistaticsurfaceoronthe
antistaticbag.
Having reviewed the precautions above, the next step is to take the mother-
board out of the cardboard box and static bag, hold it by its edges, and place it
on a grounded antistatic surface, component side up. Inspect the board for
damage.
DONOTAPPLYPOWERTOTHE BOARDIFITHASBEENDAMAGED!
Press down on any of the socket ICs if it appears that they are not properly
seated (the board should still be on an antistatic mat). Do not touch the bottom
of the board. Remember, don’t take any electronic device out of its protective
bag until you are ready to actually install it into the computer case. If you do
not ground yourself, you risk zapping the motherboard or adapter card.
Subsequent problems may not arise immediately because electrostatic dis-
charge damage, unlike physical damage, causes the device to fail over time.
Installation Steps
1. Set Jumpers
2. Mount Motherboard in Chassis
3.Install Memory
4.Install CPU & Cooling Fan
5. Connect IDE and Floppy Drives
6. Connect Power Supply
7. Install Add-on Cards
8.Connect PS/2, USB, Serial andParallel Devices
!!
!!
!
important!

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12
Chapter 2
Board Installation
Quick References for Jumpers
In this manual, the terms “closed” and “on” are used when referring to jumpers
(or jumper pins) that are active; “open” and “off” are used when referring to
jumpers (or jumper pins) that are inactive. See theFigure 2-1 for examples of
“on” and “off” pins and jumpers. The square pin in the diagram is Pin 1.
Jumpers and pins are connected by slipping the blue plastic jumper connector
overtop of two adjacent jumper pins (indicated by 1-2 or 2-3). The metal rod
inside the plastic shell bridges the gap between the two pins, completing the
circuit. See Figure2-2 for more example of pin connections.
Figure 2-1 Figure2-2
The tables and maps on the following pages will help you set the jumpers for
CPU speed, Infrared, and external connector pin assignments, among others.
Theminiature motherboard maps will help you locate the jumpers on yourboard.
A full-page map of the motherboard can be found on the next two pages.
2pinjumpers
off on
3(ormore)pinjumpers
1-2 2-3 open
1
2
3
1
2
3
1
2
3

S1856 Tomahawk BX/A+
13
INSTALL
The tiny “1”s next to jumpers of 3 pins or more indicate the position of pin 1
for that jumper.
Figure 2-3 : Map of Motherboard Jumpers
JP10
JP11
JP12
JP13
USB1 Keyboard
USB2
Mouse
DIMM bank 2
DIMM bank 3
DIMM bank 1
Primary IDE connector
3 volt
lithium
battery
COM2 COM1
Printer Port
PCI slot 2
PCI slot 3
AGP port
PCI slot 4
PCI slot 5
ISA slot 2
ISA slot 1
Flash BIOS
1J47
Intel 82443BX
OR
Via 82C693
PCI slot 1
Socket370
CPU
Intel
82371EB
OR
Via 82C596A
FAN2
1
Secondary IDE connector
Floppy drive connector
ATX power connector
ADM9240
EXTSMI
1JP1
1
JP2
Ensoniq
Audio PCI
1
J11
1
J13
J10
11
1CON3
CON2
Joystick
Line in
Microphone in Speaker out
J7
JP17
1
1
1
FAN1
1
Chassis Intrusion
J48 (Spkr)

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14
Chapter 2
Board Installation
Winbond Super I/O
3 DIMM slots
Socket 370 for
Celeron CPU
PS/2 Mouse &
Keyboard
ports
Floppy port
ATX power
supply header
5 PCI slots2 ISA slots 2x AGP port
Battery
2 USB ports
1 Parallel, 2 Com
ports
2-ch EIDE Intel 440BX or ViaApollo
Pro Plus AGPset
BIOS
Audio ports Joystick
Figure 2-4 : Map of S1856 Features

S1856 Tomahawk BX/A+
15
INSTALL
!!
!!
!
important!
1. Setting Jumpers
1-A. CPU Speed Settings (Jumpers JP10, JP11, JP12, JP13)
There are two steps to set the CPU speed. First, set the clock multiplier with
jumpers JP10 -13 according to the specification of your CPU using the chart
below. After the system is ready to boot up you will need to set the bus speed
in the BIOS setup. This is covered in detail in Chapter 3 of this manual.
Presently all Celeron CPUs use a 66MHz bus speed. Tyan does not recommend
operating CPUs, memory, or PCI Bus at higher than rated speed. Tyan takes no
responsibility for any problems related to overclocking any bus or component
on the system board.
Multiplier Bus Speed CPU speed JP10 JP11 JP12 JP13
(set Jmprs
on board) (set in
BIOS)
3.5 100 350 ON OFF OFF ON
4 100 400 OFF ON ON ON
66 300
100 450
66 333
100 500
66 366
100 550
66 400
100 600
6.5 66 433 ON ON OFF OFF
7 66 466 ON OFF ON OFF
OFFONONON
OFF OFF OFF ON
OFF ON OFF ON
OFF OFF ON ON
4.5
5
5.5
6
JP10, JP11,
JP12, JP13

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16
Chapter 2
Board Installation
1-B. Bus Speed Settings (JP1)
1-C. Panel Connector Settings (Jumper J47)
VCC 12 PowerLED
HDD LED 34 SleepLED
Ground 56PowerOn/Off
Reset 78 Ground
VCC 910 No Connect
IR R eceive 11 12 VCC
Ground 13 14 No Connect
IR Transm it 15 16 VCC
No Connect 17 18 No Connect
*PowerLED: For2-pin:
bicolor/single color -
Use pins 2-4
For 3-pin: bicolor -
Use pins 2-4 and GND pin 13
1-D. Speaker Connector
(Jumper J48)
The speaker should be
connected to pins 1-4 of
jumper J48. As default, pins
3-4 of jumper J48 are
connected to the internal
buzzer.
1-E. Wake-On LAN (CON3)
1-F. Wake-On Ring (CON2)
12
34
56
78
901
1121
3141
5161
7181
Top Bottom
Top Pin
Bottom Pin
J10 Side View
J47
Pin1
Pin17
Pin2
otuA66
001
1PJ
2-13-2nepO

S1856 Tomahawk BX/A+
17
INSTALL
!!
!!
!
important!
1-G. Clear CMOS and Reset Password (Jumper JP3)
tluafeDteseR
3PJ
2-13-2
If you have been locked out of your system because you forgot your pass-
word or set the CMOS incorrectly, follow the instructions below.
1. Power off the system
2. Set jumper JP2 to pins 2 and 3
3. Wait for 2 seconds, then return jumper JP2 to pins 1 and 2.
4. Power on the system again.
By following this procedure, you will erase your password and reset the
CMOS to the BIOS defaults.
Fan Speed Detect
When using Intel’s LANDesk
system management software,
you may monitor the status of
the CPU Fans by connecting
them to the Fan1 and/or Fan2
connectors. You will NOT be
able to monitor your CPU fan
with the other Fan connectors.
Soft Power Connector
The Soft Power Connector is
part of jumper block J47. The
Tomahawk BX/A+ uses the chipset for power management, including turning
on and off the system. If the Power Button Function option in the BIOS Power
Management Menu is set to On/Off (which is the default), pressing the power
button once after the BIOS has booted up will turn the system on and off. If
the Power Button Function option is set to Suspend, pressing the power
button once will wake the system or send it to Suspend mode. In this case,
you cannot turn the system off unless you shut down through the Windows
operating system or you hold the power button down for four seconds.
CON3
(WOL)
J9
J48 (Speaker)
CON2
(WOR)
JP2 Clr CMOS

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18
Chapter 2
Board Installation
!!
!!
!
important!
Hardware Reset Switch Connector Installation
The Reset switch on your case’s display panel provides you with the Hard-
ware Reset function, which is the same as power on/off. The system will do a
cold start after the Reset button is pushed.
Creative Labs Audio Connectors (S1856SLA only)
There are four black 4-pin connectors onboard which are used for various
peripherals’ audio signals. The digital signal that comes in through these
connectors is directed through the Creative Labs ES1373 PCI sound chip, and
the digital signal is turned into an audio signal which goes out through the
speaker.The TDAconnector (J10) is for modem audio; the MPEG connector
(J9) is for DVD and TV cards; the VIDEO connector is (J11); the CD connector
(J13)isfor CD-ROMs.
External SMI
TheEXTSMI (External System Management Interface) connector, jumper JP16,
is used by some plug-in cards. Certain applications associated with these plug-
in cards use the interface for hardware control and queries.
Chassis Intrusion Alarm Connector
The J7 connector is an intrusion alarm, that can be connected to the system
chassis. When active (J7 is connected to the chassis), this alarm will alert the
system administrator anytime someone opens the system’s case.
CMOS RTC
The Real Time Clock (RTC) circuit, which provides the date and time for the
system is integrated into the 440BX orViaApollo Pro PlusAGPset. If the
external battery for the RTC is low, it will prevent your system from POSTing,
and you will not get a display. Normally the life span of an external battery is 2
years. If yours is running low, you will need to replace it with a new 3V lithium
battery(Sony CR2032).
Flash EEPROM
TheTomahawk BX/A+ uses flash memory to store BIOS firmware. It can be
updated as new versions of the BIOS become available. You can upgrade your
BIOS easily using the flash utility (see page 59).

S1856 Tomahawk BX/A+
19
INSTALL
2. Mounting the Motherboard in the Chassis
Follow the instructions provided by the case manufacturer for proper installa-
tion guidelines. TYAN recommends that you use only one screw to hold down
the motherboard. The rest of the mounting holes should be used for the plastic
standoffs. If your case does not have a hole for a standoff, simply cut off the
bottom of the plastic standoff so that the flat portion rests on the metal. The
adapter cards and the screws holding them down will keep your board flat. The
fastening screw should not short any of the traces on the motherboard. Make
certain that you do not overtighten the screw, as it will damage the mother-
board and possibly break internal traces in the surrounding area. The hole you
should use is located at the top-center of the board where the adapter cards
are fastened to the case.
3. Installing Memory
Since TYAN boards are manufactured with performance in mind, you should
use add-in components that match. Some DIMM modules may seem to be high
quality because of name or feel but that does not guarantee real-world
usability. Some cheaper or OEM memory may have brand-name components,
but they may contain inferior or substandard parts which do not meet the
critical tolerances our products require. Because of this, your memory may not
work correctly in aTYAN board though it may work well in a competitor’s
board. This is because many of our competitors do not adhere to the strict
tolerances required for high performance. If you buy a TYAN board, you are
getting the best system available. To make installation easy and trouble free,
get high quality parts. Some brands we recommend areAdvantage Memory,
Corsair Microsystems, Millenium, Kingston Memory, QesTec Incorporated,
Unigen, Micron Technology, and Crucial Technology. These DIMMs have
proven to be very stable on our boards and perform extremely well.
!!
!!
!
important!

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20
Chapter 2
Board Installation
Figure 13
Figure2-5
To install your DIMMs, line your module up so that the pins fit into the slot.
There is only one way that your DIMM can fit properly. Make sure that the
short row of pins is lined up with the short gap in the DIMM slot. Figure 2-5
shows how to sit the DIMM into its slot. To insert the DIMM, push down
vertically on the module with even force, as shown in the photo. Do not shove
one end in first; doing so will bend the DIMM pins.
To lock the DIMM into place, push the plastic clips on either end of the slot
onto the notches in the ends of the DIMM (see Figure 2-6 on the next page).
To remove your DIMM, simply pull the clips back, and pull up on the module.
Place the DIMMs in an anti-static bag as soon as you remove them to avoid
static damage.
This manual suits for next models
4
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