
GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486VF

Processor  80486SX/80487SX/80486DX/80486DX2/80486DX4/Pentium Overdrive
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   SiS
Max.       128MB
Onboard
DRAM
Cache      64/128/256/512KB
BIOS       AWARD
Dimensions 230mm x 218mm
I/O        32-bit VESA local bus slots (3), green PC feature
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  External battery           J1       Power LED & keylock          J7

  Turbo switch               J3       External power              JP33

  Turbo LED                  J4       LED connector               JP34

  Speaker                    J5       32-bit VESA Local bus     SL1-SL3
                                      slots

  Reset switch               J6

                        USER CONFIGURABLE SETTINGS

                 Function                    Jumper          Position

      Turbo mode enabled                       J3           pins 2 & 3
                                                              closed

      Turbo mode disabled                      J3           pins 1 & 2
                                                              closed

      80486DX2, DX or OverDrive                JP8          pins 1 & 2
      installed                                               closed

      80486SX installed                        JP8          pins 2 & 3
                                                              closed

     Non AMD CPU                             JP11            Closed

      AMD CPU                                 JP11             Open

     For Cyrix CPU installed                 JP18             Open

      For normal operation                    JP18            Closed

     Normal CPU ADS# operation               JP20          pins 2 & 3
                                                              closed

      Delay CPU ADS# clock operation          JP20          pins 1 & 2
                                                              closed

      Cyrix CPU in use                        *JP21         pins 1 & 2
                                                              closed

      Other CPU in use                        *JP21         pins 2 & 3
                                                              closed

     DX4CPU x 2                              JP24          pins 3 & 4
                                                              closed

     DX4CPU x 3                              JP24             Open

     Cyrix CPU                               JP24          pins 2 & 3
                                                              closed

      CMOS memory normal operation            JP16          pins 1 & 2
                                                              closed

      CMOS memory clear                       JP16          pins 2 & 3
                                                              closed

      Green PC mode disabled                  JP26             Open

      Green PC mode enabled                   JP26            Closed

     Monitor type select CGA                 JP17            Closed

      Monitor type select other               JP17             Open

  Note: *This option applies to Revision 6 only.

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      17MB        (4) 256K x 9    (4) 4M x 9

      20MB        (4) 1M x 9      (4) 4M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

      64MB        (4) 16M x 9        NONE

      65MB        (4) 256K x 9   (4) 16M x 9

      68MB        (4) 1M x 9     (4) 16M x 9

      80MB        (4) 4M x 9     (4) 16M x 9

     128MB        (4) 16M x 9    (4) 16M x 9

                            CACHE CONFIGURATION

       Size             Bank 0            Bank 1               TAG

       64KB           (4) 8K x 8        (4) 8K x 8         (1) 8K x 8

      128KB           (4) 32K x 8          NONE            (1) 8K x 8

      256KB           (4) 32K x 8       (4) 32K x 8      (1) 16K x 8/(1)
                                                             32K x 8

      256KB           (4) 64K x 8          NONE          (1) 16K x 8/(1)
                                                             32K x 8

      512KB          (4) 128K x 8          NONE            (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

    Size          JP1            JP2            JP3             JP4

    64KB          Open           Open           Open            N/A

   128KB         Closed          Open           Open         pins 1 & 2
                                                               closed

   256KB         Closed         Closed          Open         pins 2 & 3
                                                               closed

   256KB         Closed         Closed          Open         pins 1 & 2
                                                               closed

   512KB         Closed         Closed         Closed        pins 1 & 2
                                                               closed

   VL-BUS SPEED CONFIGURATION

    CPU Type         JP29

  DX-50/40 MHz      Closed

  Other Speed        Open

                       CPU VOLTAGE SELECTION

       CPU Type                 JP36                   JP37

     5 Voltage CPU             Closed                 Closed

  3.3 Voltage DX4 CPU           Open                   Open

            CPU SPEED SELECTION

   Speed      JP5        JP6        JP7

   25MHz      Open       Open     Closed

   33MHz     Closed     Closed    Closed

   40MHz      Open      Closed    Closed

   50MHz     Closed      Open      Open

  50iMHz      Open       Open     Closed

  66iMHz     Closed     Closed    Closed

  75iMHz      Open       Open     Closed

  100iMHz    Closed     Closed    Closed

                           DELAY LOCAL BUS CLOCK

                           J2 (VESA1)       J8(VESA2)        J9(VESA3)

         For normal       pins 1 & 2       pins 1 & 2       pins 1 & 2
          operation          closed          closed            closed

        DX-33, DX-40,      pins 2 & 3       pins 2 & 3       pins 2 & 3
        DX-50, DX2-66,       closed          closed            closed
       DX4-75, DX4-100*

    Note: *For some VL-Bus interface cards that need more address setup
                       time in above listed speeds.

