Tomahawk BX (S1856)  
 | BIOS | CPU | Drivers |

  Benefits and Applications

Tyan Tomahawk BX is a quality, high performance single processor system platform that supports the powerful Intel PPGA-370 Celeron™ microprocessors. This board is designed around the Intel 440BX AGPset as well as VIA´s Apollo Pro Plus chipset. Please refer to the Motherboard CPU Compatibility Chart for more specs.

The Tomahawk BX supports SPD SDRAM  memory and  ECC SDRAM.  The board's PCI Local Bus and new 32-bit AGP bus provides high performance capabilities that are ideal for a wide range of demanding applications such as: basic business and general operations.

This integrated system board achieves the highest reliability and is based on an ATX form factor. Some of the features included are: on-board dual channel PCI IDE,  on-board floppy controller, on-board high speed I/O, Universal Serial Bus, on-board PS/2 mouse connector, on-board wavetable sound (optional), and on-board system mangement (optional).

Flexibility and expandibility are present in the Tomahawk BX. With I/O and drive controller support built on-board, the S1856S allows many upgrade paths not found on other boards.. With three 168-pin DIMM sockets,  the Tomahawk BX can provide a very flexible memory configuration of up to 768 MB SPD SDRAM or SDRAM+ECC in addition to the new 100 MHz SDRAMs.  


  • Processor
    Celeron 300-533 MHz CPU
    One Socket 370 up to 100MHz FSB
    One rev 8.4 VRM on-board
    Two on-board CPU/case fan headers
    Processor speeds:
    CPU compatibility chart
  • Chipset
    Intel 440BX (100 MHz AGP set)
    Winbond `977 Super I/O chipset
  • System Memory
    Up to 768MB SDRAM Memory Support
    Synchronous DRAM W/SPD
    SDRAM + ECC; three 168-pin DIMM Sockets
    100 MHz SDRAM support
  • Expansion Slots
    Five 32-bit PCI Bus Mastering Slots
    Two 16-bit
    ISA Slots; one 32-bit AGP Slot
    One Shared PCI/ISA Slot (7 usable slots)
  • Integrated Audio (optional)
    Ensoniq 1371 PCI Wavetable audio chip
    AC97 codec / One ATX Game port
    ATX Line in, MIC, and speaker ports
  • System Management (optional)
    ADM9240 sensor chips with on-board alarm for heat, fan and voltage. 
    Reports to the operating system for system monitoring.
    Tyan Desktop Client Mgr software included
    Chassis Intrusion Detection capable
  • Voltage and Power
    ATX Power Supply Connector
    +12V Power Source for DC-FAN on-board
    3.3V DRAM Support
    Utilizes GTL+ Bus, Reducing Power Consumption and EMI
    Power recovery after interrupt feature
    Wake-on-LAN Feature Header (3-pin)
    * Requires ATX 2.01 Compliant PS
  • Disk Drive & System I/O
    UltraDMA/33 (UIDE) built-in
    (up to 33MB/s DTR)
    Two PCI Bus Mastering
    EIDE channels
    Supports EIDE CD-ROMs
    Bus-Mastering Mode (Up to 22MB/s DTR)
    PIO Mode 3 & 4 (Up to 17MB/s DTR)
    Two Floppy Drive Support (Up to 2.88MB)
    Two ATX Serial Ports (16550 UARTs)
    One ATX ECP/EPP Parallel Port
    Two ATX USB Rev 1.2 Ports
    One IR (InfraRed) I/O Interface Port
    One ATX PS/2 Mouse Port
    One ATX PS/2 Keyboard Port
  • BIOS
    Award Plug 'n' Play flash BIOS Standard
    Deep Green / Energy Star / PC98 ready
    Yellow LED for Sleep mode
    Year 2000 compliant

Information published on is subject to change without notice.
Copyright © 2006, Tyan Computer Corporation. All Rights Reserved.