
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.

