
GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486VT

Processor        80486SX/80487SX/CX486S/CX486S2/80486DX/

                 80486DX2/Pentium Overdrive
Processor Speed  20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         UMC
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       230mm x 218mm
I/O Options      32-bit VESA local bus slots (3)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  External battery            J2       Power LED & keylock         J9

  Turbo LED                   J5       32-bit VESA Local bus       S1
                                       slot

  Reset switch                J6       32-bit VESA Local bus       S2
                                       slot

  Turbo switch                J7       32-bit VESA Local bus       S3
                                       slot

  Speaker                     J8

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     CMOS memory normal operation            J3            pins 1 & 2
                                                              closed

      CMOS memory clear                       J3            pins 2 & 3
                                                              closed

     Monitor type select CGA                 J11             Closed

      Monitor type select all others          J11              Open

              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

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

      16MB        (4) 4M x 9         NONE

      32MB        (4) 4M x 9      (4) 4M 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) 32K x 8

                        CACHE JUMPER CONFIGURATION

    Size         W0           W1           W2           W3         W4

    64KB       pins 1 &      Open         Open       pins 1 &    pins 1 &
                  2                                     2           2

    128KB      pins 1 &     Closed        Open       pins 2 &    pins 2 &
                  2                                     3           3

    256KB      pins 2 &     Closed       Closed      pins 1 &    pins 2 &
                  3                                     2           3

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

        Type                JP3              JP10               W6

       80486SX             Open           pins 1 & 2         pins 2 & 3
                                            closed            closed

       80487SX             Open           pins 1 & 2         pins 1 & 2
                                            closed            closed

       CX486S              Open           pins 1 & 2         pins 2 & 3
                                            closed            closed

       CX486S2            Closed          pins 1 & 2         pins 2 & 3
                                            closed            closed

       80486DX             Open           pins 1 & 2         pins 1 & 2
                                            closed            closed

      80486DX2             Open           pins 1 & 2         pins 1 & 2
                                            closed            closed

  Pentium Overdrive        Open           pins 2 & 3         pins 1 & 2
                                            closed            closed

                          CPU SPEED CONFIGURATION

      Speed              JP2                JP6                 W5

      20MHz           pins 1 & 2            Open               Open
                        closed

      25MHz           pins 1 & 2            Open               Open
                        closed

      33MHz           pins 1 & 2            Open               Open
                        closed

      40MHz           pins 2 & 3           Closed             Closed
                        closed

     50i MHz          pins 1 & 2            Open               Open
                        closed

      50MHz           pins 2 & 3           Closed              Open
                        closed

     66i MHz          pins 1 & 2            Open               Open
                        closed

        VESA CONFIGURATION

     Setting           JP5

  0 wait states        Open

  1 wait state        Closed

