
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

