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.