GIGA-BYTE TECHNOLOGY CO., LTD.

GA-486SA

Processor              80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed        16/20/25/33/50(internal)/50/66(internal)MHz
Chip Set               OPTI
Max. Onboard DRAM      128MB
Cache                  64/128/256/512KB
BIOS                   AMI
Dimensions             330mm x 218mm
I/O Options            32-bit local bus card slots (2)
NPU Options            4167

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  Power LED & keylock         J1        Turbo switch               J4

  Reset                       J2        Turbo LED                  J5

  Speaker                     J3        32-bit local bus        S1 & S2
                                        cards (2)

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   CPU type select 80486DX                  J6            pins 1 & 2
                                                              closed

      CPU type select 80486SX                  J6            pins 2 & 3
                                                              closed

  »   Monitor type select color                J14            Closed

      Monitor type select monochrome           J14             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

      64MB        (4) 16M x 9        NONE

     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) 32K x 8

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

                        CACHE JUMPER CONFIGURATION

     Size           J8             J9            J10             J11

     64KB          Open           Open          Open            Open

    128KB          Open          Closed         Open          pins 1 & 2
                                                               closed

    256KB          Open          Closed        Closed         pins 2 & 3
                                                               closed

    512KB         Closed         Closed        Closed         pins 1 & 2
                                                               closed