
SOYO COMPUTER CO., LTD.

SY-25 T

Processor   UMCU5S/AM486SX/80486SX/CX486DX/AM486DX/AM486DXL/
            80486DX/SL80486DX/CX486DX2/AM486DX2/80486DX2/
            SL80486DX2/AM486DX4/SL80486DX4/P24D/P24T
Processor   25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/
Speed       100(internal)MHz
Chip Set    Unidentified
Video Chip  None
Set
Maximum     128MB
Onboard
Memory
Maximum     None
Video
Memory
Cache       256KB
BIOS        Award
Dimensions  254mm x 218mm
I/O Options 32-bit VESA local bus slots (3), green PC connector
NPU Options None

[Image]

                                CONNECTIONS

  Purpose                 Location    Purpose                   Location

  Power LED & keylock       J17       Turbo switch                J21

  Speaker                   J18       Turbo LED                   J22

  Reset switch              J19       Green PC connector          JP25

  External battery          J20       32-bit VESA local bus    SL1  SL3
                                      slots

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     CMOS memory normal operation            J20           Pins 2 & 3
                                                              closed

      CMOS memory clear                       J20           Pins 3 & 4
                                                              closed

      Battery type select external            J20             Closed

                            SIMM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2          Bank 3

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

     2MB         (1) 512K x       None           None            None
                    36

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

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

     4MB         (1) 256K x     (1) 256K x     (1) 512K x        None
                    36             36             36

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

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

     6MB         (1) 256K x     (1) 256K x    (1) 1M x 36        None
                    36             36

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

     8MB         (1) 256K x     (1) 256K x     (1) 512K x    (1) 1M x 36
                    36             36             36

     8MB         (1) 512K x     (1) 512K x    (1) 1M x 36        None
                    36             36

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

     8MB        (1) 2M x 36       None           None            None

     10MB        (1) 256K x     (1) 256K x    (1) 1M x 36    (1) 1M x 36
                    36             36

     12MB        (1) 512K x     (1) 512K x    (1) 1M x 36    (1) 1M x 36
                    36             36

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

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

     16MB       (1) 1M x 36    (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

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

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

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

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

     18MB        (1) 256K x     (1) 256K x    (1) 4M x 36        None
                    36             36

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

     20MB        (1) 512K x     (1) 512K x    (1) 4M x 36        None
                    36             36

     20MB       (1) 1M x 36    (1) 2M x 36    (1) 2M x 36        None

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

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

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36        None

                        SIMM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     24MB        (1) 1M x 36    (1) 1M x 36    (1) 2M x 36   (1) 2M x 36

     24MB        (1) 2M x 36    (1) 4M x 36       None           None

     24MB        (1) 2M x 36    (1) 2M x 36    (1) 2M x 36       None

     28MB        (1) 1M x 36    (1) 2M x 36    (1) 2M x 36   (1) 2M x 36

     32MB        (1) 2M x 36    (1) 2M x 36    (1) 2M x 36   (1) 2M x 36

     32MB        (1) 2M x 36    (1) 2M x 36    (1) 4M x 36       None

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

     32MB        (1) 8M x 36       None           None           None

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

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

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

     40MB        (1) 1M x 36    (1) 1M x 36    (1) 4M x 36   (1) 4M x 36

     40MB        (1) 2M x 36    (1) 2M x 36    (1) 2M x 36   (1) 4M x 36

     40MB        (1) 1M x 36    (1) 1M x 36    (1) 8M x 36       None

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

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

     48MB        (1) 2M x 36    (1) 2M x 36    (1) 8M x 36       None

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

     64MB        (1) 4M x 36    (1) 4M x 36    (1) 4M x 36   (1) 4M x 36

     64MB        (1) 4M x 36    (1) 4M x 36    (1) 8M x 36       None

     64MB        (1) 16M x 36      None           None           None

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

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

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

     68MB        (1) 1M x 36    (1) 8M x 36    (1) 8M x 36       None

     72MB        (1) 1M x 36    (1) 1M x 36     (1) 16M x        None
                                                   36

     72MB        (1) 1M x 36    (1) 1M x 36    (1) 8M x 36   (1) 8M x 36

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

     80MB        (1) 4M x 36    (1) 8M x 36    (1) 8M x 36       None

     80MB        (1) 2M x 36    (1) 2M x 36    (1) 8M x 36   (1) 8M x 36

     96MB        (1) 4M x 36    (1) 4M x 36     (1) 16M x        None
                                                   36

     96MB        (1) 4M x 36    (1) 4M x 36    (1) 8M x 36   (1) 8M x 36

     96MB        (1) 8M x 36    (1) 8M x 36    (1) 8M x 36       None

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

     128MB       (1) 8M x 36    (1) 8M x 36    (1) 8M x 36   (1) 8M x 36

            Note: Board also accepts x 32 SIMMs. Do not use any other
            combination of SIMM configuration.

                            CACHE CONFIGURATION

       Size              Bank 0            Bank 1              TAG

     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

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

       256KB (B)           Pins 1 & 2, 3 & 4         Pins 1 & 2 closed
                                closed

            CPU SPEED SELECTION

   Speed      JP4        JP5        JP6

   25MHz      Open       Open     Closed

   33MHz     Closed     Closed    Closed

   40MHz      Open      Closed    Closed

  50iMHz      Open       Open     Closed

  66iMHz     Closed     Closed    Closed

  75iMHz      Open       Open     Closed

  80iMHz      Open      Closed    Closed

  100iMHz    Closed     Closed    Closed

                            CPU TYPE SELECTION

        Type           JP11        JP12       JP13      JP14       JP15

      UMC U5S          2 & 3      2 & 3       2 & 3     2 & 3     2 & 3

      AM486SX          Open       2 & 3       2 & 3     2 & 3     2 & 3

      80486SX          Open       2 & 3       2 & 3     2 & 3     2 & 3

    CX486DX (5v)       1 & 2,    1 & 2, 3     1 & 2,    2 & 3     2 & 3
                       3 & 4     & 4, 5 &     3 & 4
                                    6

      AM486DX          Open       2 & 3       1 & 2,    2 & 3     2 & 3
                                              3 & 4

   AM486DXL (5v)       2 & 3      2 & 3       1 & 2,    2 & 3     2 & 3
                                              3 & 4

      80486DX          Open       2 & 3       1 & 2,    2 & 3     2 & 3
                                              3 & 4

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

   CX486DX2 (5v)       1 & 2,    1 & 2, 3     1 & 2,    2 & 3     2 & 3
                       3 & 4     & 4, 5 &     3 & 4
                                    6

     CX486DX2-66       1 & 2,    1 & 2, 3     1 & 2,    1 & 2     1 & 2
       (3.6v)          3 & 4     & 4, 5 &     3 & 4
                                    6

  CX486DX2-80 (4v)     1 & 2,    1 & 2, 3     1 & 2,    1 & 2     1 & 2
                       3 & 4     & 4, 5 &     3 & 4
                                    6

      AM486DX2         Open       2 & 3       1 & 2,    2 & 3     2 & 3
                                              3 & 4

     AM486DX2-80       Open       2 & 3       1 & 2,    1 & 2     1 & 2
      (3.45v)                                 3 & 4

   AM486DXL2 (5v)      2 & 3      2 & 3       1 & 2,    2 & 3     2 & 3
                                              3 & 4

      80486DX2         Open       2 & 3       1 & 2,    2 & 3     2 & 3
                                              3 & 4

     SL80486DX2        1 & 2      1 & 2       1 & 2,    2 & 3     2 & 3
                                              3 & 4

  AM486DX4 (3.45v)     Open       2 & 3       1 & 2,    1 & 2     1 & 2
                                              3 & 4

     SL80486DX4        1 & 2      1 & 2       1 & 2,    1 & 2     1 & 2
      (3.45v)                                 3 & 4

  SL80486DX4 (5v)      1 & 2      1 & 2       1 & 2,    2 & 3     2 & 3
                                              3 & 4

        P24D           1 & 2,    1 & 2, 4     1 & 2,    2 & 3     2 & 3
                       4 & 5       & 5        3 & 4

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

  Note: Pins designated should be in the closed position.

                        CPU TYPE SELECTION (CONT)

        Type              JP16         JP17         JP18         JP19

       UMC U5S           2 & 3        3 & 4        1 & 2         Open

       AM486SX           2 & 3         Open         Open         Open

       80486SX           2 & 3         Open         Open         Open

    CX486DX (5v)         2 & 3        1 & 2      2 & 3, 4 &      2 & 3
                                                     5

       AM486DX           2 & 3        1 & 2         Open         Open

    AM486DXL (5v)        2 & 3      1 & 2, 3 &     1 & 2         Open
                                        4

       80486DX           2 & 3        1 & 2         Open         Open

      SL80486DX          2 & 3        1 & 2        5 & 6       1 & 2, 3 &
                                                                   4

    CX486DX2 (5v)        2 & 3        1 & 2      2 & 3, 4 &      2 & 3
                                                     5

  CX486DX2-66 (3.6v)     1 & 2        1 & 2      2 & 3, 4 &      2 & 3
                                                     5

  CX486DX2-80 (4v)       1 & 2        1 & 2      2 & 3, 4 &      2 & 3
                                                     5

      AM486DX2           2 & 3        1 & 2         Open         Open

     AM486DX2-80         1 & 2        1 & 2         Open         Open
       (3.45v)

   AM486DXL2 (5v)        2 & 3      1 & 2, 3 &     1 & 2         Open
                                        4

      80486DX2           2 & 3        1 & 2         Open         Open

     SL80486DX2          2 & 3        1 & 2        5 & 6       1 & 2, 3 &
                                                                   4

  AM486DX4 (3.45v)       1 & 2        1 & 2         Open         Open

  SL80486DX4 (3.45v)     1 & 2        1 & 2        5 & 6       1 & 2, 3 &
                                                                   4

   SL80486DX4 (5v)       2 & 3        1 & 2        5 & 6       1 & 2, 3 &
                                                                   4

        P24D             2 & 3        1 & 2      3 & 4, 5 &    1 & 2, 3 &
                                                     6             4

        P24T             2 & 3        2 & 3        5 & 6       1 & 2, 3 &
                                                                   4

  Note: Pins designated should be in the closed position.

                            CPU TYPE SELECTION

         Type               JP20            JP26               JP27

       UMC U5S              Open            Open               Open

       AM486SX              Open            Open               Open

       80486SX              Open            Open               Open

     CX486DX (5v)           Open            Open               Open

       AM486DX              Open            Open               Open

    AM486DXL (5v)           Open            Open               Open

       80486DX              Open            Open               Open

      SL80486DX             Open            Open               Open

    CX486DX2 (5v)           Open            Open               Open

  CX486DX2-66 (3.6v)        Open            Open            Pins 3 & 4
                                                              closed

   CX486DX2-80 (4v)         Open            Open            Pins 5 & 6
                                                              closed

       AM486DX2             Open            Open               Open

  AM486DX2-80 (3.45v)       Open           Closed           Pins 1 & 2
                                                              closed

    AM486DXL2 (5v)          Open            Open               Open

       80486DX2             Open            Open               Open

      SL80486DX2            Open            Open               Open

   AM486DX4 (3.45v)         Open            Open            Pins 1 & 2
                                                              closed

  SL80486DX4 (3.45v)        Open            Open            Pins 1 & 2
                                                              closed

   SL80486DX4 (5v)          Open            Open               Open

         P24D               Open            Open               Open

         P24T               Open            Open               Open

  Note: Pins designated should be in the closed position.

