SOYO COMPUTER CO., LTD.

SY-020M


Processor              80486SX/80487SX/80486DX/80486DX2
Processor Speed        20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set               SIS
Max. Onboard DRAM      32MB
Cache                  64/128/256KB
BIOS                   AMI
Dimensions             245mm 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

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

      16MB        (4) 4M x 9         NONE

      20MB        (4) 1M x 9      (4) 4M x 9

      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     JP21    JP22     JP23     JP24     JP25    JP26     JP27

   64KB    1 & 2    1 & 2    1 & 2   1 & 2    1 & 2    1 & 2    2 & 3

  128KB    1 & 2    1 & 2    2 & 3   2 & 3    2 & 3    1 & 2    1 & 2

  256KB    2 & 3    2 & 3    2 & 3   2 & 3    2 & 3    2 & 3    2 & 3

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

     Type          Oscillator      JP9       JP11       JP12       JP13
                      OSC1

   80486SX -         40MHz        2 & 3      Open       2 & 3     2 & 3
     20MHz

   80486SX -         25MHz        1 & 2      Open       2 & 3     2 & 3
     25MHz

   80487SX -         40MHz        2 & 3     Closed      2 & 3     1 & 2
     20MHz

   80486DX -         33MHz        1 & 2     Closed      1 & 2     1 & 2
     25MHz

   80486DX -         33MHz        1 & 2     Closed      1 & 2     1 & 2
     33MHz

   80486DX -         50MHz        1 & 2     Closed      1 & 2     1 & 2
     50MHz

   80486DX2 -        25MHz        1 & 2     Closed      1 & 2     1 & 2
     50MHz

   80486DX2 -        33MHz        1 & 2     Closed      1 & 2     1 & 2
     66MHz

  Note: Pins designated should be in the closed position.