GIGA-BYTE TECHNOLOGY CO., LTD.

GA-686EX2 (REV. 1.0)

Device Type            Mainboard
Processor              Pentium II
Processor Speed        200/233/266/300/333/366MHz
Chip Set               Intel 440EX
Video Chip Set         None
Maximum Onboard Memory 256MB (EDO & SDRAM supported)
Maximum Video Memory   None
Cache                  256/512KB (located on Pentium II CPU)
BIOS                   Award
Dimensions             243mm x 190mm
I/O Options            32-bit PCI slots (2), floppy drive interface, IDE
                       interfaces (2), parallel port, PS/2 mouse port,
                       serial ports (2), USB connectors (2), ATX power
                       connector, AGP slot

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  AGP slot                   AGP       Serial port 1              CN2

  ATX power connector        ATX       Serial port 2              CN3

  Reset switch                C1       USB connector 1            CN4

  Speaker                     C2       USB connector 2            CN5

  IDE interface LED           C3       Floppy drive               CN6
                                       interface

  Soft off power supply       C4       IDE interface 2            CN7

  Power LED                   C5       IDE interface 1            CN8

  CPU fan power               C6       PS/2 mouse port             J2

  Parallel port              CN1       32-bit PCI slots         PC1 – PC2

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      ATX power control select soft           J7               Open
      off

      ATX power control select soft           J7              Closed
      off/full on

      Keyboard power on enabled               JP1           Pins 1 & 2
                                                              closed

      Keyboard power on disabled              JP1           Pins 2 & 3
                                                              closed

              DIMM CONFIGURATION

      Size          Bank 0          Bank 1

      8MB         (1) 1M x 64        None

      16MB        (1) 2M x 64        None

      16MB        (1) 1M x 64    (1) 1M x 64

      24MB        (1) 2M x 64    (1) 1M x 64

      32MB        (1) 4M x 64        None

      32MB        (1) 2M x 64    (1) 2M x 64

      40MB        (1) 4M x 64    (1) 1M x 64

      48MB        (1) 4M x 64    (1) 2M x 64

      64MB        (1) 8M x 64        None

      64MB        (1) 4M x 64    (1) 4M x 64

      72MB        (1) 8M x 64    (1) 1M x 64

      80MB        (1) 8M x 64    (1) 2M x 64

      96MB        (1) 8M x 64    (1) 4M x 64

     128MB        (1) 16M x 64       None

     128MB        (1) 8M x 64    (1) 8M x 64

              DIMM CONFIGURATION (CON’T)

       Size            Bank 0            Bank 1

      136MB         (1) 16M x 64       (1) 1M x 64

      144MB         (1) 16M x 64       (1) 2M x 64

      160MB         (1) 16M x 64       (1) 4M x 64

      192MB         (1) 16M x 64       (1) 8M x 64

      256MB         (1) 16M x 64      (1) 16M x 64

            Note: Board accepts EDO & SDRAM memory.

                     CACHE CONFIGURATION

  Note: 256KB/512KB cache is located on the Pentium II CPU.

                            CPU SPEED SELECTION

  CPU speed    Clock speed    Multiplier      JP2        JP3       JP4

    200MHz        66MHz           3x         1 & 2      1 & 2     1 & 2

    233MHz        66MHz          3.5x        1 & 2      1 & 2     1 & 2

    266MHz        66MHz           4x         1 & 2      1 & 2     1 & 2

    300MHz        66MHz          4.5x        1 & 2      1 & 2     1 & 2

    333MHz        66MHz           5x         1 & 2      1 & 2     1 & 2

    366MHz        66MHz          5.5x        1 & 2      1 & 2     1 & 2

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (CON’T)

    CPU       Clock    Multiplier     SW1/1    SW1/2     SW1/3     SW1/4
   speed     speed

  200MHz     66MHz         3x          On       Off       On        On

  233MHz     66MHz        3.5x         Off      Off       On        On

  266MHz     66MHz         4x          On        On       Off       On

  300MHz     66MHz        4.5x         Off       On       Off       On

  333MHz     66MHz         5x          On       Off       Off       On

  366MHz     66MHz        5.5x         Off      Off       Off       On