Tomahawk A+ (S1856-V) 
 | BIOS | CPU | Drivers |

  Benefits and Applications

Tyan Tomahawk A+ is a quality, high performance single processor system platform based on the powerful Intel PPGA-370 Celeron microprocessors. This mainboard is designed around the latest and fastest Intel 440BX AGPset as well as VIA´s Apollo Pro Plus AGPset. Please refer to the Motherboard CPU Compatibility Chart for more specs.

The Tomahawk A+ supports SPD SDRAM  memory and  ECC SDRAM.  The S1856'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: CAD, CAM, CAE, real-time 3D, and simulations.

This integrated system board achieves the highest reliability and is based on a  double row 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 have been designed into the Tomahawk A+. With I/O and drive controller support built on-board, the Tomahawk A+ allows many upgrade paths not found on other boards.. With three 168-pin DIMM sockets,  the board can provide a very flexible memory configuration of up to 768MB SPD SDRAM or SDRAM+ECC in addition to the new 100 MHz SDRAMs.  


  • Processor
    Celeron 300-466 MHz CPU
    One Socket 370 connector
    Up to 100 MHz bus support
    One rev 8.4 VRM on-board
    Two on-board CPU/case fan headers
    Processor speeds:
    CPU compatibility chart
  • Chipset
    VIA Apollo Pro Plus AGPset
    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
    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
  • 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
  • Voltage and Power
    ATX Power Supply Connector
    +12V Power Source for DC-FAN on-board
    3.3V DRAM Support; consumption and EMI
    Utilizes GTL+ Bus, Reducing Power Power recovery after interrupt feature
    WoL Feature Header (3-pin)
    * Requires ATX 2.01 Compliant Power Supply
  • 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.