
SOYO COMPUTER CO., LTD.

SY-25 J/K/L

Processor  CX486S/80486SX/CX486DX/AM486DX/SL80486DX/AM486DX2/
           80486DX2/AM486DX4/80486DX4/P24D/P24T
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Video Chip None
Set
Maximum    128MB (EDO supported)
Onboard
Memory
Maximum    None
Video
Memory
Cache      64/128/256KB
BIOS       Award
Dimensions 254mm x 218mm
I/O        32-bit VESA local bus slots (3), green PC connector
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  Power LED & keylock       J17       Turbo LED                   J22

  Speaker                   J18       Green PC connector          JP4

  Reset switch              J19       Green PC connector          JP6

  External battery          J20       Green PC connector          JP7

  Turbo switch              J21       32-bit VESA local bus    SL1  SL3
                                      slots

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Monitor type select monochrome        JP3              Open

      Monitor type select                   JP3             Closed
      color/EGA/VGA

     CMOS memory normal operation          JP5        Pins 1 & 2 closed

      CMOS memory clear                     JP5        Pins 2 & 3 closed

     Factory configured - do not           JP17       Pins 1 & 2 closed
      alter

     Factory configured - do not           JP27       Pins 1 & 2 closed
      alter

     Factory configured - do not           JP32       Pins 1 & 2 closed
      alter

     Factory configured - do not           JP34         Unidentified
      alter

                       SIMM CONFIGURATION 1

      Size            Bank 0           Bank 1          Bank 2

       1MB         (4) 256K x 9         None            None

       2MB         (4) 256K x 9    (1) 256K x 36        None

       4MB          (4) 1M x 9          None            None

       5MB         (4) 256K x 9     (1) 1M x 36         None

       6MB         (4) 256K x 9    (1) 256K x 36     (1) 1M x 36

       8MB          (4) 1M x 9      (1) 1M x 36         None

      12MB          (4) 1M x 9      (1) 1M x 36      (1) 1M x 36

      16MB          (4) 4M x 9          None            None

      17MB         (4) 256K x 9     (1) 4M x 36         None

      18MB         (4) 256K x 9    (1) 256K x 36     (1) 4M x 36

      20MB          (4) 1M x 9      (1) 4M x 36         None

      24MB          (4) 1M x 9      (1) 1M x 36      (1) 4M x 36

      32MB          (4) 4M x 9      (1) 4M x 36         None

      36MB          (4) 1M x 9      (1) 4M x 36      (1) 4M x 36

      48MB          (4) 4M x 9      (1) 4M x 36      (1) 4M x 36

      64MB         (4) 16M x 9          None            None

      65MB         (4) 256K x 9     (1) 16M x 36        None

      68MB          (4) 1M x 9      (1) 16M x 36        None

      72MB          (4) 1M x 9      (1) 1M x 36     (1) 16M x 36

      80MB          (4) 4M x 9      (1) 16M x 36        None

      96MB          (4) 4M x 9      (1) 4M x 36     (1) 16M x 36

      128MB        (4) 16M x 9      (1) 16M x 36        None

                       SIMM CONFIGURATION 2

      Size            Bank 0           Bank 1          Bank 2

       1MB             None        (1) 256K x 36        None

       2MB             None        (1) 256K x 36    (1) 256K x 36

       2MB             None        (1) 512K x 36        None

       4MB             None        (1) 512K x 36    (1) 512K x 36

       4MB             None         (1) 1M x 36         None

       5MB             None        (1) 256K x 36     (1) 1M x 36

       6MB          (4) 1M x 9     (1) 256K x 36    (1) 256K x 36

       6MB             None        (1) 512K x 36     (1) 1M x 36

       8MB             None         (1) 1M x 36      (1) 1M x 36

       8MB             None         (1) 2M x 36         None

      12MB          (4) 1M x 9      (1) 1M x 36      (1) 1M x 36

      12MB             None         (1) 1M x 36      (1) 2M x 36

      16MB             None         (1) 2M x 36      (1) 2M x 36

      16MB             None         (1) 4M x 36         None

      17MB             None        (1) 256K x 36     (1) 4M x 36

      18MB          (4) 4M x 9     (1) 256K x 36    (1) 256K x 36

      18MB             None        (1) 512K x 36     (1) 4M x 36

      20MB             None         (1) 1M x 36      (1) 4M x 36

      24MB          (4) 4M x 9      (1) 1M x 36      (1) 1M x 36

      32MB             None         (1) 4M x 36      (1) 4M x 36

      32MB             None         (1) 8M x 36         None

      36MB          (4) 4M x 9      (1) 1M x 36      (1) 4M x 36

      36MB             None         (1) 1M x 36      (1) 8M x 36

      48MB          (4) 4M x 9      (1) 4M x 36      (1) 4M x 36

      48MB             None         (1) 4M x 36      (1) 8M x 36

      64MB             None         (1) 8M x 36      (1) 8M x 36

      65MB             None        (1) 256K x 36    (1) 16M x 36

      68MB             None         (1) 1M x 36     (1) 16M x 36

      72MB         (4) 16M x 9      (1) 1M x 36      (1) 1M x 36

      80MB             None         (1) 4M x 36     (1) 16M x 36

      96MB         (4) 16M x 9      (1) 4M x 36      (1) 4M x 36

      128MB            None         (1) 16M x 36    (1) 16M x 36

            Note: Board also accepts x 32 SIMMs.

                         SIMM JUMPER CONFIGURATION

    Configuration          JP35              JP36              JP37

          1              Pins 1 & 2        Pins 1 & 2        Pins 1 & 2
                          closed            closed            closed

          2              Pins 2 & 3        Pins 2 & 3        Pins 2 & 3
                          closed            closed            closed

                            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 (A)        (4) 32K x 8        (4) 32K x 8     (1) 16K/32K x 8

     256KB (B)        (4) 64K x 8           None         (1) 16K/32K x 8

                        CACHE JUMPER CONFIGURATION

      Size               JP9               JP10               JP13

      64KB            Pins 2 & 3           Open         Pins 1 & 2 closed
                       closed

      128KB           Pins 2 & 3        Pins 1 & 2      Pins 2 & 3 closed
                       closed             closed

    256KB (A)         Pins 1 & 2        Pins 2 & 3      Pins 2 & 3 closed
                       closed             closed

    256KB (B)         Pins 1 & 2        Pins 2 & 3      Pins 2 & 3 closed
                       closed             closed

            CPU SPEED SELECTION

   Speed      JP29       JP30      JP31

   25MHz     Closed      Open     Closed

   33MHz      Open      Closed    Closed

   40MHz     Closed      Open      Open

  50iMHz     Closed      Open     Closed

   50MHz      Open      Closed     Open

  66iMHz      Open      Closed    Closed

  75iMHz     Closed      Open     Closed

  80iMHz     Closed      Open      Open

  100iMHz     Open      Closed    Closed

                            CPU TYPE SELECTION

       Type          JP1        JP2       JP11        JP12        JP14

     CX 486S        1 & 2      2 & 3      2 & 3      1 & 2       1 & 2

     80486SX        2 & 3      1 & 2      3 & 4      2 & 3       2 & 3

     CX 486DX       1 & 2      2 & 3      2 & 3      1 & 2       1 & 2

     AM486DX        2 & 3      1 & 2      3 & 4      2 & 3       3 & 4

    SL80486DX       2 & 3      1 & 2      3 & 4      2 & 3       3 & 4

     AM486DX2       2 & 3      1 & 2      3 & 4      2 & 3       3 & 4

     80486DX2       2 & 3      1 & 2      3 & 4      2 & 3       3 & 4

     AM486DX4       2 & 3      1 & 2      3 & 4      2 & 3       3 & 4

     80486DX4       2 & 3      1 & 2      3 & 4      2 & 3       3 & 4

  80486DX4 (ODP)    2 & 3      1 & 2      3 & 4      2 & 3       3 & 4

       P24D         1 & 2      1 & 2     1 & 2, 3    2 & 3      1 & 2, 3
                                           & 4                    & 4

       P24T         2 & 3      1 & 2      3 & 4      2 & 3       3 & 4

  Note: Pins designated should be in the closed position.

                        CPU TYPE SELECTION (CONT)

       Type           JP15           JP16           JP18         JP19

     CX 486S          2 & 3          Open          2 & 3         2 & 3

     80486SX          Open           Open          2 & 3         4 & 5

     CX 486DX         2 & 3          Open          2 & 3         2 & 3

     AM486DX          2 & 3          Open          2 & 3         4 & 5

    SL80486DX         2 & 3          Open          2 & 3         4 & 5

     AM486DX2         2 & 3          Open          2 & 3         4 & 5

     80486DX2         2 & 3          Open          2 & 3         4 & 5

     AM486DX4         2 & 3          Open          2 & 3         4 & 5

     80486DX4         2 & 3          Open          2 & 3         4 & 5

  80486DX4 (ODP)      2 & 3          Open          2 & 3         4 & 5

       P24D           2 & 3         Closed         1 & 2         4 & 5

       P24T           1 & 2          Open          2 & 3         1 & 2

  Note: Pins designated should be in the closed position.

                        CPU TYPE SELECTION (CONT)

       Type            JP20          JP21          JP22          JP23

     CX 486S           Open          Open         2 & 3          2 & 3

     80486SX           Open         1 & 2          Open          Open

     CX 486DX          Open          Open         2 & 3          2 & 3

     AM486DX           Open         1 & 2          Open          Open

    SL80486DX          Open         1 & 2          Open          Open

     AM486DX2         2 & 3         1 & 2          Open          Open

     80486DX2          Open         1 & 2          Open          Open

     AM486DX4         1 & 2         1 & 2          Open          Open

     80486DX4          Open         1 & 2          Open          Open

  80486DX4 (ODP)       Open         1 & 2          Open          Open

       P24D           1 & 2         2 & 3         1 & 2          Open

       P24T            Open          Open         1 & 2          1 & 2

  Note: Pins designated should be in the closed position.

                 CPU VOLTAGE SELECTION

          Voltage                      JP24

           3.45v             Pins 3 & 5, 4 & 6 closed

             5v              Pins 1 & 3, 2 & 4 closed

