SOYO COMPUTER CO., LTD.

SY-021


Processor            80386DX/80486SX/80486DX
Processor Speed      25/33/40/50MHz
Chip Set             Intel
Max. Onboard DRAM    32MB
Cache                64/256KB (on CPU/Cache card)
BIOS                 Intel
Dimensions           330mm x 218mm
I/O Options          32-bit external CPU/Cache card slot, bus mouse,
                     floppy drive interface, parallel port, serial port
NPU Options          None


[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                Location

  32-bit external            CN1        Speaker                   J18
  CPU/Cache card

  Bus mouse                   J2        Reset switch              J19

  Serial port                 J3        External battery          J20

  Parallel port               J5        Turbo switch              J21

  Floppy drive                J7        Turbo LED                 J22
  interface

  Power LED & keylock        J17

  Note:The Turbo switch and Turbo LED may not be present on all board
  revisions.

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

  »   Floppy drive interface select            J6              Open
      1.44MB

      Floppy drive interface select            J6            pins 1 & 2
      1.2MB                                                   closed

  »   Wait states select zero                  J8              Open

      Wait states select one                   J8             Closed

  »   Posted write control enabled             J9              Open

      Posted write control disabled            J9             Closed

  »   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

  Note:Jumper JP3 and JP5 may not be present on all board revisions.

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       4MB        (4) 256K x 36         NONE

       8MB        (4) 256K x 36    (4) 256K x 36

       8MB        (4) 512K x 36         NONE

      12MB        (4) 512K x 36    (4) 256K x 36

      16MB        (4) 512K x 36    (4) 512K x 36

      16MB         (4) 1M x 36          NONE

      20MB         (4) 1M x 36     (4) 256K x 36

      24MB         (4) 1M x 36     (4) 512K x 36

      32MB         (4) 1M x 36      (4) 1M x 36

      32MB         (4) 2M x 36          NONE

      36MB         (4) 2M x 36     (4) 256K x 36

      40MB         (4) 2M x 36     (4) 512K x 36

      48MB         (4) 2M x 36      (4) 1M x 36

      64MB         (4) 2M x 36      (4) 2M x 36

      64MB         (4) 4M x 36          NONE

      68MB         (4) 4M x 36     (4) 256K x 36

      72MB         (4) 4M x 36     (4) 512K x 36

      80MB         (4) 4M x 36      (4) 1M x 36

      96MB         (4) 4M x 36      (4) 2M x 36

      128MB        (4) 4M x 36      (4) 4M x 36