
GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486VF REV.8C

Processor  CX486M6/AM486/80486SX/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 connector
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  External battery           J1       Power LED & keylock          J7

  Turbo switch               J3       Green PC connector          JP33

  Turbo LED                  J4       Green PC LED connector      JP34

  Speaker                    J5       32-bit VESA local bus     S1 - S3
                                      slots

  Reset switch               J6

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     CPU type select all CPUs              JP11             Closed

      CPU type select AMD CPU only           JP11              Open

     CMOS memory normal operation           JP16           pins 1 & 2
                                                              closed

      CMOS memory clear                      JP16           pins 2 & 3
                                                              closed

     Monitor type select CGA                JP17             Closed

      Monitor type select all others         JP17              Open

     CPU type select all CPU types          JP21           pins 2 & 3
                                                              closed

      CPU type select Cyrix, P24D, AMD       JP21           pins 1 & 2
      enhanced CPU only                                       closed

     Green PC normal operation              JP26              Open

      Green PC green mode                    JP26             Closed

     Cache type select write through        JP30           pins 2 & 3
                                                              closed

      Cache type select write back           JP30           pins 1 & 2
                                                              closed

              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 or
                                                           (1) 32K x 8

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

          CPU TYPE CONFIGURATION

        Type                 JP24

       CX486M6        pins 2 & 3 closed

       AM486SL        pins 2 & 5 closed

        P24D          pins 2 & 5 closed

     AM486DX4 2x      pins 3 & 4 closed

     AM486DX4 3x       pins 3 & 4 open

     80486DX4 2x      pins 3 & 4 closed

     80486DX4 3x       pins 3 & 4 open

                    CPU TYPE CONFIGURATION

        Type                 JP8                  JP18

       CX486M6               N/A                  Open

       80486SX         pins 2 & 3 closed         Closed

       80486DX         pins 1 & 2 closed         Closed

      80486DX2         pins 1 & 2 closed         Closed

      80486DX4         pins 1 & 2 closed         Closed

  Pentium Overdrive    pins 1 & 2 closed         Closed

                          CPU SPEED CONFIGURATION

     Speed          JP5            JP6            JP7            JP29

     25MHz          Open           Open         Closed           Open

     33MHz         Closed         Closed        Closed           Open

     40MHz          Open          Closed        Closed          Closed

    50iMHz          Open           Open         Closed           Open

     50MHz         Closed          Open          Open           Closed

    66iMHz         Closed         Closed        Closed           Open

  75i (40 x 2)      Open          Closed        Closed          Closed
      MHz

  75i (25 x 3)      Open           Open         Closed           Open
      MHz

   100i (50 x      Closed          Open          Open           Closed
    2) MHz

   100i (33 x      Closed         Closed        Closed           Open
    3) MHz

     CPU VOLTAGE CONFIGURATION

  Function     JP36        JP37

   3.3 v       Open        Open

    5 v       Closed      Closed

                        VOLTAGE DELAY CONFIGURATION

         Function              J2         J8          J9         JP20

   Normal card installed      1 & 2      1 & 2      1 & 2        2 & 3

    Card installed needs      2 & 3      2 & 3      2 & 3        1 & 2
       address time

  Note: Pins designated should be in closed position. Systems utilizing
  cards that need more address time are: DX4-100, DX4-75, DX2-66, DX-50,
  DX-40, DX-33.

