Table of Contents
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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.
PRINTED IN USA.
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Table of Contents
Related Manuals for TYAN TOMAHAWK BX
Summary of Contents for TYAN TOMAHAWK BX
- Page 1 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.
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Page 2: Table Of Contents
Table of Contents 1. Introduction....................4 Overview................... 4 Icons....................5 Hardware Specifications/Features..........5 Software Specifications..............7 Technical Support................7 Returning Merchandise for Service..........8 2. Board Installation..................10 Unpacking..................10 Installation..................10 Quick Reference for Jumpers............12 Map of Motherboard Jumpers............. 13 Clear CMOS &... - Page 3 User Password................58 Flash Writer Utility................. 59 4. System Resources..................62 Beep Codes..................62 Troubleshooting System Problems..........63 Displayed Error Messages............71 Appendix 1 - CPU Retention Module Options.......... 74 Appendix 2 - Glossary.................. 76...
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Page 4: Introduction
Introduction Introduction Overview The S1856 (S1856S Tomahawk BX, and S1856S-V Tomahawk A+) is a quality, high performance motherboard designed for Socket 370 Intel Celeron micropro- cessors. The Tomahawk BX utilizes the Intel 440BX AGPset with AMI BIOS. The Tomahawk A+ uses the VIA Apollo Pro Plus AGPset with Award BIOS. -
Page 5: Icons
Remember to take a look at TYAN Computer’s web site located at http://www.tyan.com. There you can find information on all of TYAN’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. - Page 6 •AMI Plug and Play flash BIOS (S1856S) •Award Plug and Play flash BIOS (S1856S-V) •Deep Green, Energy Star, ACPI, Year 2000, and PC98 compliant •Soft power-down, multiple boot options •Win98/NT5 ready, DMI 2.0 compliant •PCI 2.1, APM 1.1 compliant http://www.tyan.com...
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Page 7: Software Specifications
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 S1856 Tomahawk BX/A+... -
Page 8: Returning Merchandise For Service
Return Merchandise Authorization (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. http://www.tyan.com... - Page 9 This page left blank intentionally. S1856 Tomahawk BX/A+...
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Page 10: Board Installation
What’s the first thing I should do? 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: http://www.tyan.com... -
Page 11: Installation Steps
2. Mount Motherboard in Chassis 3. Install Memory procedure 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 and Parallel Devices S1856 Tomahawk BX/A+... -
Page 12: Quick Reference For Jumpers
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. The miniature motherboard maps will help you locate the jumpers on your board. A full-page map of the motherboard can be found on the next two pages. http://www.tyan.com... -
Page 13: Map Of Motherboard Jumpers
PCI slot 4 Via 82C596A EXTSMI J48 (Spkr) PCI slot 5 Flash BIOS ISA slot 2 ISA slot 1 The tiny “1”s next to jumpers of 3 pins or more indicate the position of pin 1 for that jumper. S1856 Tomahawk BX/A+... - Page 14 Chapter 2 Board Installation Figure 2-4 : Map of S1856 Features PS/2 Mouse & Keyboard Socket 370 for ATX power ports 3 DIMM slots Celeron CPU supply header http://www.tyan.com...
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Page 15: Setting Jumpers
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. - Page 16 (Jumper J48) Pin17 The speaker should be connected to pins 1-4 of Bottom Pin jumper J48. As default, pins J10 Side View 3-4 of jumper J48 are connected to the internal buzzer. 1-E. Wake-On LAN (CON3) 1-F. Wake-On Ring (CON2) http://www.tyan.com...
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Page 17: Clear Cmos & Reset Password
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. -
Page 18: Hardware Reset Switch Connector Installation
(Sony CR2032). Flash EEPROM The Tomahawk 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). -
Page 19: Mounting The Motherboard In The Chassis
Because of this, your memory may not ! ! ! ! ! work correctly in a TYAN board though it may work well in a competitor’s board. This is because many of our competitors do not adhere to the strict important! tolerances required for high performance. - Page 20 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. http://www.tyan.com...
- Page 21 Figure 2-6 The Tomahawk BX/A+ uses a 64-bit data path from memory to CPU and can accommodate up to 768MB of SDRAM. The 168-pin DIMMs (Dual In-line Memory Modules) must be of the 3.3V, unbuffered variety. The position of the notch in the SDRAM key position will tell you whether or not a DIMM is unbuffered (see the Figure 2-7 below).
- Page 22 PC-100 DIMM is required if CPU bus speed is at 100MHz The table below shows some of the possible memory configurations. Not all possible configurations are listed. l a t *256MB modules not validated at time of print. See www.tyan.com for latest memory compatibility information. http://www.tyan.com...
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Page 23: Cache Memory
L2 cache size of 128KB and a cacheable memory area of 512MB. 4. Installing the CPU and Cooling Fan Socket 370 type Celeron processors (300 through 400MHz) can be used on the Tomahawk BX/A+. Please refer to page 15 for the correct CPU jumper settings for your CPU. Remember: •... -
Page 24: Connecting Ide And Floppy Drives
IDE connector is white. In most cases, this is the proper way of connecting your IDE cable to the hard drive. Figure 2-10 on the next page shows the IDE cable properly connected to the motherboard. Contact your hard disk drive manufacturer or documentation for more informa- tion. http://www.tyan.com... -
Page 25: Connecting Floppy Drives
2 floppy drives connected at any given time. The color stripe on the cable should face toward the top of your chassis, or toward the battery on the motherboard. Please refer to your documentation for proper installation. S1856 Tomahawk BX/A+... - Page 26 Try another cable or floppy drive to verify. • Light on the floppy is on constantly: a dead giveaway that the cable is on backwards. Reverse the cable at the motherboard end and try again. http://www.tyan.com...
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Page 27: Connecting The Power Supply
6. Connecting the Power Supply Tyan recommends using an ATX power supply that conforms to industry standard revision 2.01. The Tomahawk BX/A+ motherboard comes equipped with one onboard power connector. Figure 2-13 below shows an ATX power connector. When plugging in the power connector, make sure that the plastic clip on the power connector is aligned with the plastic tab on the onboard connector (see Figure 2-14 below). -
Page 28: Installing Add On Cards
The USB (Universal Serial Bus) is a versatile port. This one port type can function as a serial, parallel, mouse, keyboard, or joystick port. It is fast enough to support video transfer, and is capable of supporting up to 127 daisy-chained peripheral devices. Figures 2-15 and 2-16 http://www.tyan.com... -
Page 29: Connecting Com And Printer Ports
The Com and Printer ports, as well as the other ports, are labeled. Note: Only TYAN cables will work on this motherboard. If you are using an existing case with old cables, your system will not function properly. Use only TYAN-approved cables. -
Page 30: Frequently Asked Questions
IRQ, or DMA. If you are using Windows 95, the Device Manager is a good place to start. Please consult your operating system manual for details. Second of all, slowing down the memory timing in the BIOS’s chipset setup section will help the situation, as well. Many memory modules are not suitable http://www.tyan.com... - Page 31 A: Currently, only Windows 98 and Windows NT 5.0 will have built-in support for AGP. Some AGP cards require Windows 95 OSR2.1 or a special driver from Intel. Please check with your graphics vendor for more details. S1856 Tomahawk BX/A+...
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Page 32: Bios Configuration
Setup. Starting Setup The EliteBIOS is immediately activated when you first turn on the computer. The BIOS reads system configuration information in CMOS RAM and begins http://www.tyan.com... -
Page 33: Setup Keys
If, after making and saving system changes with Setup, you discover that your computer no longer is able to boot, the EliteBIOS supports an override to the CMOS settings that resets your system to its default configuration. S1856 Tomahawk BX/A+... - Page 34 Chipset screen without a good reason. The Chipset defaults have been carefully chosen by Award Software or your system manufacturer for the best performance and reliability. Even a seemingly small change to the Chipset setup may causing the system to become un- stable. http://www.tyan.com...
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Page 35: Main Setup Menu
IDE HDD AUTO DETECTION PNP/PCI CONFIGURATION HDD LOW LEVEL FORMAT LOAD BIOS DEFAULTS SAVE & EXIT SETUP LOAD SETUP DEFAULTS EXIT WITHOUT SAVING Esc : Quit : Select Item F10 : Save & Exit Setup (Shift)F2 : Change Color S1856 Tomahawk BX/A+... - Page 36 BIOS defaults are factory settings for the most stable, minimal-performance system operations. Load Setup Defaults Setup defaults are factory settings for optimal-performance system operations. Save & Exit Setup Save settings in nonvolatile CMOS RAM and exit Setup. Exit Without Saving http://www.tyan.com...
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Page 37: Standard Cmos Setup
The time format is based on the 24-hour military-time clock. For example, 1 p.m. is 13:00:00. Press the arrow keys to move to the desired field. Press the PgUp or PgDn key to increment the setting, or type the desired value into the field. S1856 Tomahawk BX/A+... - Page 38 LBA (Logical Block Addressing): During drive accesses, the IDE controller transforms the data address described by sector, head, and cylinder number into a physical block address, significantly improving data transfer rates. For drives with greater than 1024 cylinders. http://www.tyan.com...
- Page 39 , r o l l a , l l . s r e t t , s r , l l e t t . s r , r o , l l . s r S1856 Tomahawk BX/A+...
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Page 40: Bios Features Setup
PC AT BIOS. This section describes all fields offered by Award Software in this screen. The example screen below may vary from the one in your Setup program. Your system board designer may omit or modify some fields. http://www.tyan.com... - Page 41 Typematic Rate (Chars/Sec) Typematic Delay (Msec) Security Option Setup Setup PCI / VGA Palette Snoop Disabled Disabled OS Select For DRAM > 64MB Non-OS2 Non-OS2 Video BIOS Shadow Enabled Enabled C8000-CBFFF Shadow Disabled Disabled CC000-CFFFF Shadow Disabled Disabled S1856 Tomahawk BX/A+...
- Page 42 A, and then on drive C (hard disk). However, modern computers usually load the operating system from the hard drive, and may even load it from a CD-ROM drive. The BIOS now offers a large number of boot devices and boot sequence options. http://www.tyan.com...
- Page 43 When the typematic rate setting is enabled, you can select a typematic rate (the rate at which character repeats when you hold down a key) of 6, 8, 10,12, 15, 20, 24 or 30 characters per second. S1856 Tomahawk BX/A+...
- Page 44 BIOS Features Setup screen may be occupied by other expan- sion card firmware. If an expansion peripheral in your system contains ROM- based firmware, you need to know the address range the ROM occupies to shadow it into the correct area of RAM. http://www.tyan.com...
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Page 45: Chipset Features Setup
PC 98 LED : Disabled OnChip USB : Disabled ESC : Quit : Select Item F1 : Help PU/PD/+/- : Modify F5 : Old Values (Shift)F2 : Color F6 : Load BIOS Defaults F7 : Load Setup Defaults S1856 Tomahawk BX/A+... - Page 46 This option specifies the location of an area of memory that cannot be addressed on the ISA bus. The settings are Disabled, 512KB-64KB, or 15MB- 16MB. Read Around Write Increases memory throughput. Concurrent PCI/Host Allows access of multiple PCI devices simultaneously by the CPU. http://www.tyan.com...
- Page 47 Controls the clock speeds for the CPU and PCI bus. The maximum rated PCI bus speed is 33MHz. This feature allows overclocking the CPU, memory and PCI bus. Tyan does not recommend and is not responsible for functional problems associated with overclocking. If lockups or memory errors occur you may need to reduce the CPU Host/PCI Clock speeds.
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Page 48: Power Management Setup
Video Off Option Suspend Suspend Video Off Method V/ H SYNC+Blank V/ H SYNC+Blank MODEMUse IRQ Soft-Off by PWRBTN Instant Off Delay 4 sec HDD Pow er Dow n Disabled Disabled Doze Mode Disabled Disabled Suspend Mode Disabled Disabled http://www.tyan.com... -
Page 49: Acpi Function
. ) e PM Control by APM If Advanced Power Management (APM) is installed on your system, selecting Yes gives better power savings. S1856 Tomahawk BX/A+... - Page 50 The following modes are Green PC power saving functions that are user- configurable only in User Defined Power Management mode. HDD Power Down After the selected period of drive inactivity (1 to 15 minutes), the hard disk drive powers down while all other devices remain active. http://www.tyan.com...
- Page 51 This feature allows remote power up through a LAN connection when used in conjunction with a Wake on LAN compliant network adapter and appropriate software. Primary INTR A system peripheral signals that it wants to gain the attention of the operating S1856 Tomahawk BX/A+...
- Page 52 The following is a list of IRQs (Interrupt Request Lines) assigned to common system peripherals. IRQ3 (COM2) IRQ10 (Reserved) IRQ4 (COM1) IRQ11 (Reserved) IRQ5 (LPT2) IRQ12 (PS/2 Mouse) IRQ6 (Floppy Disk) IRQ13 (Coprocessor) IRQ7 (LPT1) IRQ14 (Hard Disk) IRQ8 (RTC Alarm) IRQ15 (Reserved) IRQ9 (IRQ2 Redir) http://www.tyan.com...
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Page 53: Pnp/Pci Configuration
PCI Master Read Prefetch Disabled Enabled PCI#2 Access #1 Retry Disabled Disabled AGP Master 1 WS Write Disabled Enabled AGP Master 1 WS Read Disabled Disabled PCI IRQ Activated By Level Level Assign IRQ for VGA Disabled Enabled S1856 Tomahawk BX/A+... - Page 54 When this field is Enabled, writes from the CPU to the PCI bus are buffered, to compensate for the speed differences between the CPU and the PCI bus. When Disabled, the writes are not buffered and the CPU must wait until the write is complete before starting another write cycle. http://www.tyan.com...
- Page 55 Edge-triggered interrupts. Assign IRQ for USB Assign an IRQ number to the onboard USB port. Assign IRQ for VGA Assign an IRQ number to your VGA adapter. Assign IRQ for ACPI Assign an IRQ number to ACPI. S1856 Tomahawk BX/A+...
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Page 56: Integrated Peripherals
IDE Primary Slave UDMA Disabled Disabled IDE Secondary Master UDMA Disabled Disabled IDE Secondary Slave UDMA Disabled Disabled Init Display First PCI Slot PCI Slot POWER ON Function BUTTON ONLY BUTTON ONLY KBC Input Clock 8 MHz 8 MHz http://www.tyan.com... - Page 57 IDE device. Init Display First Select the type of display adapter used in your system. POWER ON Function This option enables power on from Windows 98 keyboard, right or left mouse S1856 Tomahawk BX/A+...
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Page 58: User Password
(2) always remain off when power is restored following a power outage; or (3) restore / maintain the last power status before power failure. User Password When you select this function, a message appears at the center of the screen: http://www.tyan.com... -
Page 59: Flash Writer Utility
You can upgrade the BIOS on your motherboard by using the Flash Memory Writer (FMW) utility. This utility can be downloaded from TYAN’s BBS and from the TYAN website. The system BIOS is stored on a flash EEPROM chip on the mainboard, which can be erased and reprogrammed by the FMW. The following three files make up the FMW: AWDFLASH.EXE... - Page 60 BIOS file is in the same directory as the FMW utility. To start FMW, change to the “Flash” directory if you are not already in it. Type “awdflash” at the DOS command line and press the <Enter> key. The FMW utility screen will appear: http://www.tyan.com...
- Page 61 Warning: If you do not successfully install a complete BIOS file in the flash memory on the mainboard, your system may not be able to boot. If this happens, it will require service by your system vendor. Follow the instructions in this section precisely to avoid such an inconvenience. S1856 Tomahawk BX/A+...
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Page 62: System Resources
If AMIBIOS POST can initialize the system video display, it displays the error message. Displayed error messages, in most cases, allow the system to continue to boot. Displayed error messages are described on pages 71-72. See the top of the next page for the beep code chart. http://www.tyan.com... -
Page 63: Troubleshooting System Problems
If it still beeps, replace the cache memory. 4, 5, 7, or 10 times... for 5 or 7 beeps, first test with a new CPU - if that does not solve the problem, then motherboard must be replaced. S1856 Tomahawk BX/A+... - Page 64 . l u r a t n i t Uncompressed Initialization Codes The following routine checkpoint codes are listed in order of execution. These codes are uncompressed in F000h shadow RAM. The table begins on the next page. http://www.tyan.com...
- Page 65 , c i l l i . t n i t i f n i o i t i s s r t n r i u g i f i t a . t s S1856 Tomahawk BX/A+...
- Page 66 . t x i r e e i f t f o n i r t f o s i h t i s o i t . t x http://www.tyan.com...
- Page 67 . t x t t i r i n i a i t z i l i t a . t x S1856 Tomahawk BX/A+...
- Page 68 . t x i n I a i t z i l i t a e t f . e t . t x . t x http://www.tyan.com...
- Page 69 , t u l a r . t n i n i a i t z i l i t a i n I a i t i z i l r h t S1856 Tomahawk BX/A+...
- Page 70 I a i t z i l i t a . r e http://www.tyan.com...
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Page 71: Displayed Error Messages
. y r f i d r e f u l i o i t e z i f i d r e f i l i t . y t S1856 Tomahawk BX/A+... - Page 72 . t o : s i y t i y t i . y r : s i y t i y t i . s s y t i http://www.tyan.com...
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Page 74: Appendix 1 - Cpu Retention Module Options
Appendix 1 CPU Retention Module Options CPU Retention Module Options Tyan offers two different options for securing Intel’s Pentium II CPUs onto the motherboard. Each option provides retention for both older Pentium II’s as well as newer Pentium II’s (including Celeron). - Page 75 One universal retention module is included in the motheboard package. This type of retention module adapts to both old and new Pentium II CPUs - see Figure 3. (Screws for the retention modules are provided) Figure 3 S1856 Tomahawk BX/A+...
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Page 76: Appendix 2 - Glossary
AT form factor. It improves on the AT design by rotating the board ninety degrees, so that the IDE connec- tors are closer to the drive bays, and the CPU is closer to the power supply http://www.tyan.com... - Page 77 512KB, while you may have as much as 1GB of regular memory. Cache size refers to the physical size of the cache onboard. This should not be confused with the cacheable area, which is the total amount of memory S1856 Tomahawk BX/A+...
- Page 78 Dynamic RAM is a widely available, very affordable form of RAM which has the unfortunate tendency to lose data if it is not recharged regu- larly (every few milliseconds). This refresh requirement makes DRAM three to ten times slower than non-recharged RAM such as SRAM. http://www.tyan.com...
- Page 79 ROM chip which can, unlike normal ROM, be updated. This allows you to keep up with changes in the BIOS programs without having to buy a new chip. TYAN’s BIOS updates can be found at http://www.tyan.com/html/drivers.html ESCD (Extended System Configuration Data) is a format for storing informa- tion about Plug and Play devices in the system BIOS.
- Page 80 (PCI Programmable Input/Output) modes are the data transfer modes used by IDE drives. These modes use the CPU for data transfer (DMA channels do not). PCI refers to the type of bus used by these modes to communicate with the CPU. http://www.tyan.com...
- Page 81 By transferring data alternately from one set of addresses, and then the other, SDRAM cuts down on the delays associated with non-synchronous RAM, which must close one address bank before opening the next. S1856 Tomahawk BX/A+...
- Page 82 Zero Insertion Force sockets make it possible to insert CPUs without damaging the sensitive pins. The CPU is lightly placed in an open ZIF socket, and the metal lever pulled down. This shifts the processor over and down, guiding it into place on the board. http://www.tyan.com...
- Page 83 Replace only with the same or equivalent type recommended by manufacturer. Dispose of used batteries according to manufacturer instructions. Note: The joystick port maximum output rating is 9 amperes at 5 volts. Document # D1339-000 S1856 Tomahawk BX/A+...