
SOYO COMPUTER CO., LTD.

486DX/SX BOARD

Processor               80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed         20/25/33/40(internal)/50(internal)/66(internal)MHz
Chip Set                OPTI
Max. Onboard DRAM       64MB
Cache                   None
BIOS                    Award
Dimensions              330mm x 220mm
I/O Options             None
NPU Options             None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Power LED & keylock         J17      External battery            J20

  Speaker                     J18      Turbo switch                J21

  Reset switch                J19      Turbo LED                   J22

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select monochrome           JP3             Open

      Monitor type select color                JP3            Closed

     CMOS memory normal operation             JP5           pins 1 & 2
                                                              closed

      CMOS memory clear                        JP5           pins 2 & 3
                                                              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

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

                             CPU CONFIGURATION

      Type          JP101         JP102          JP103          JP104

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

    80487SX        Closed       pins 1 & 2     pins 2 & 3     pins 2 & 3
                                  closed        closed          closed

    ODP486SX       Closed       pins 1 & 2     pins 1 & 2     pins 1 & 2
                                  closed        closed          closed

    80486DX        Closed       pins 1 & 2     pins 1 & 2     pins 2 & 3
                                  closed        closed          closed

    80486DX2       Closed       pins 1 & 2     pins 1 & 2     pins 1 & 2
                                  closed        closed          closed

  Note:Board may be factory configured with a surface mounted 80486SX.

