SOYO COMPUTER CO., LTD.

SY-020C/D

Processor         80486SX/80486DX
Speed             20/25/33/50MHz
Chip Set          ETEQ
Max. Onboard DRAM 32MB
SRAM Cache        64/256KB
BIOS              AMI
Dimensions        325mm x 220mm
I/O Options       32-bit external memory card slot
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                  Location

  Power LED & keylock        J17       Turbo switch               J21

  Speaker                    J18       Turbo LED                  J22

  Reset switch               J19       32-Bit external             S1
                                       memory card

  External battery           J20

                         USER CONFIGURABLE JUMPERS

                Function                     Jumper          Position

  »   Factory configured - do not alter        JP2            closed

  »   Monitor type select monochrome           JP3           pins 2 & 3
                                                              closed

      Monitor type select color                JP3           pins 1 & 2
                                                              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         Bank 2         Bank 3

     1MB       (4) 256K x 9       NONE           NONE           NONE

     2MB       (4) 256K x 9   (4) 256K x 9       NONE           NONE

     3MB       (4) 256K x 9   (4) 256K x 9   (4) 256K x 9       NONE

     4MB       (4) 256K x 9   (4) 256K x 9   (4) 256K x 9   (4) 256K x 9

     4MB        (4) 1M x 9        NONE           NONE           NONE

     5MB        (4) 1M x 9    (4) 256K x 9       NONE           NONE

     6MB       (4) 256K x 9   (4) 256K x 9    (4) 1M x 9        NONE

     7MB       (4) 256K x 9   (4) 256K x 9   (4) 256K x 9    (4) 1M x 9

     8MB        (4) 1M x 9     (4) 1M x 9        NONE           NONE

     9MB        (4) 1M x 9     (4) 1M x 9    (4) 256K x 9       NONE

     10MB      (4) 256K x 9   (4) 256K x 9    (4) 1M x 9     (4) 1M x 9

     12MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9        NONE

     13MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9    (4) 256K x 9

     16MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     16MB       (4) 4M x 9        NONE           NONE           NONE

     20MB       (4) 1M x 9     (4) 4M x 9        NONE           NONE

     24MB       (4) 1M x 9     (4) 1M x 9     (4) 4M x 9        NONE

     28MB       (4) 1M x 9     (4) 1M x 9     (4) 1M x 9     (4) 4M x 9

     32MB       (4) 4M x 9     (4) 4M x 9        NONE           NONE

     36MB       (4) 1M x 9     (4) 4M x 9     (4) 4M x 9        NONE

     37MB      (4) 256K x 9    (4) 1M x 9     (4) 4M x 9     (4) 4M x 9

     40MB       (4) 1M x 9     (4) 1M x 9     (4) 4M x 9     (4) 4M x 9

     48MB       (4) 4M x 9     (4) 4M x 9     (4) 4M x 9        NONE

     49MB      (4) 256K x 9    (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

     52MB       (4) 1M x 9     (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

     64MB       (4) 4M x 9     (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

  Note:Banks 2 & 3 are used when a 32-bit external memory card is
  installed at S1.

            CACHE CONFIGURATION

     Size          Bank 0          TAG

     64KB        (8) 8K x 8    (2) 16K x 4

     256KB       (8) 32K x 8   (2) 16K x 4

                   CACHE JUMPER CONFIGURATION

   Size       JP15       JP16       JP17       JP18       JP33

   64KB       Open       Open       2 & 3      2 & 3      Open

   256KB     Closed     Closed      1 & 2      1 & 2     Closed

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

       Type              JP103              JP104             JP106

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

      80486SX          pins 1 & 2         pins 1 & 2           Open
                         closed            closed

                          CPU SPEED CONFIGURATION

  CPU Speed   Oscillator U18   Oscillator U22      JP13          JP23

    20MHz         40MHz             N/A         pins 1 & 2     pins 1 & 2
                                                  closed        closed

    25MHz          N/A             50MHz        pins 2 & 3     pins 1 & 2
                                                  closed        closed

    33MHz          N/A             66MHz        pins 2 & 3     pins 1 & 2
                                                  closed        closed

    50MHz          N/A             50MHz        pins 2 & 3     pins 2 & 3
                                                  closed        closed