SOYO COMPUTER CO., LTD.

SY-23D


Processor             80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed       20/25/33/50(internal)/66(internal)MHz
Chip Set              ETEQ
Max. Onboard DRAM     32MB
Cache                 None
BIOS                  AMI
Dimensions            241mm 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

  »   PGA or PQFP CPU enabled                  J23             Open

      PGA CPU enabled, PQFP CPU                J23            Closed
      disabled

  Note:If using the "PGA or PQFP" setting (J23 open) please note that
  only one CPU can be installed.

              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 TYPE 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

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

    ODP486SX       Closed       pins 1 & 2     pins 2 & 3     pins 2 & 3
                                  closed        closed          closed

    80486DX2       Closed       pins 1 & 2     pins 1 & 2     pins 2 & 3
                                  closed        closed          closed

                  CPU SPEED CONFIGURATION

   Speed      OSC U24       J24        J25         J26

   20MHz       40MHz       Open       Closed      Closed

   25MHz       50MHz      Closed       Open       Closed

   33MHz     66.67MHz     Closed      Closed       Open

   50iMHz      50MHz      Closed       Open       Closed

   66iMHz    66.67MHz     Closed      Closed       Open

  Note:The location of socket U24 is unknown.