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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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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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
5. EmailTyan tech support: [email protected]
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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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: