
SOYO COMPUTER CO., LTD.

SY-25M/N/P

Processor  CX486S/80486SX/80486DX/AM486DX/80486DX2/CX486DX/ 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       Green PC connector          JP4

  Speaker                   J18       Green PC connector          JP6

  Reset switch              J19       Green PC connector          JP7

  External battery          J20       Green PC connector          JP8

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

  Turbo LED                 J22

                        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 2 & 3 closed
      alter

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

     Factory configured - do not           JP34         Unidentified
      alter

                            SIMM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2          Bank 3

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

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

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

     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

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

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

     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) 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

                        SIMM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

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

     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

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

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

     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

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

     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

                            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

  100iMHz     Open      Closed    Closed

                            CPU TYPE SELECTION

      Type          JP1        JP2        JP11        JP12        JP14

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

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

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

    80486DX        2 & 3      1 & 2      3 & 4       2 & 3        1 & 2

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

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

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

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

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

  Note: Pins designated should be in the closed position.

                     CPU TYPE SELECTION (CONT)

    Type       JP15        JP16       JP18        JP19       JP20

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

  80486SX      Open        Open       2 & 3       4 & 5      Open

  CX 486DX     3 & 4       Open       2 & 3       2 & 3      Open

  80486DX      3 & 4       Open       2 & 3       4 & 5      Open

  AM486DX      3 & 4       Open       2 & 3       4 & 5      Open

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

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

    P24D       3 & 4      Closed      1 & 2       4 & 5      Open

    P24T       2 & 3       Open       1 & 2       1 & 2      Open

  Note: Pins designated should be in the closed position.

                 CPU TYPE SELECTION (CONT)

    Type        JP21        JP22        JP23        JP32

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

  80486SX      1 & 2        Open        Open       1 & 2

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

  80486DX      1 & 2        Open        Open       1 & 2

  AM486DX      1 & 2        Open        Open       1 & 2

  80486DX2     1 & 2        Open        Open       1 & 2

  80486DX4     1 & 2        Open        Open       1 & 2

    P24D       2 & 3       1 & 2        Open       1 & 2

    P24T        Open       1 & 2       1 & 2       1 & 2

  Note: Pins designated should be in the closed position.

                 CPU VOLTAGE SELECTION

          Voltage                      JP24

            3.3v             Pins 3 & 5, 4 & 6 closed

             5v              Pins 1 & 3, 2 & 4 closed

                        VL BUS WAIT STATE SELECTION

               Setting                                JP25

                    0                          Pins 1 & 2 closed

                   1                          Pins 2 & 3 closed

                          VL BUS SPEED SELECTION

                 Speed                                 JP26

                  <= 33MHz                      Pins 1 & 2 closed

                 >33 MHz                       Pins 2 & 3 closed

