
SOYO TECHNOLOGY CO., LTD.

SY-045A2/A5

Processor  80486SX/80486SX2/CX486DX/U5S/80486DX/CX486DX2/AM486DX2/
           80486DX2/AM486DX4/80486DX4/P24D/Pentium Overdrive
Processor  25/33/40/50(internal)/66(internal)/75(internal)/80(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Max.       256MB
Onboard
DRAM
Cache      256/512/1024KB
BIOS       Award
Dimensions 330mm x 218mm
I/O        32-bit VESA local bus slot, 32-bit PCI slots (4), IDE interfaces (2),
Options    parallel port, serial ports (2)
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  Serial port 1             CN1        Reset switch              J19

  Serial port 2             CN2        External battery          J20

  Parallel port             CN3        Turbo switch              J21

  Floppy drive              CN4        Turbo LED                 J22
  interface

  IDE interface             CN5        IDE interface LED         JP17
  (primary)                            (secondary)

  IDE interface             CN6        IDE interface LED         JP18
  (secondary)                          (primary)

  Power LED & keylock       J17        32-bit PCI slots       PCI1 - PCI4

  Speaker                   J18        32-bit VESA local         SL1
                                       bus slot

  Note: The locations of J19, J21, and J22 are unidentified.

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not              J7              Open
      alter

     Factory configured - do not             JP1              N/A
      alter

     Factory configured - do not             JP2              N/A
      alter

     Monitor type select color               JP3             Closed

      Monitor type select monochrome          JP3              Open

     Factory configured - do not             JP4              N/A
      alter

     CMOS memory normal operation            JP5           pins 1 & 2
                                                              closed

      CMOS memory clear                       JP5           pins 2 & 3
                                                              closed

     Factory configured - do not             JP6             Closed
      alter

     Factory configured - do not             JP7              Open
      alter

     Factory configured - do not             JP12          pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JP13             N/A
      alter

     CPU signal type select SMOUT            JP15          pins 1 & 2
                                                              closed

      CPU signal type select STPCLK           JP15          pins 2 & 3
                                                              closed

     Factory configured - do not             JP19             N/A
      alter

     Factory configured - do not             JP27          pins 2 & 3
      alter                                                   closed

     Factory configured - do not             JP28          pins 2 & 3
      alter                                                   closed

  Note: The locations of JP1, JP2, JP3, JP4, JP13, JP19, and JP29 are
  unidentified.

                            DRAM 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

     3MB        (1) 256K x     (1) 256K x     (1) 256K x        NONE
                    36             36             36

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

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

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

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

     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

     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

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0        Bank 1         Bank 2         Bank 3

     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

     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) 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) 16M x 36      NONE           NONE           NONE

     64MB       (1) 4M x 36    (1) 4M x 36    (1) 8M x 36       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

     70MB       (1) 16M x 36    (1) 512K x     (1) 512K x   (1) 512K x 36
                                   36             36

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

     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

     88MB       (1) 16M x 36   (1) 2M x 36    (1) 2M x 36    (1) 2M x 36

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

     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

    112MB       (1) 16M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

    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

    132MB       (1) 16M x 36   (1) 16M x 36    (1) 512K x   (1) 512K x 36
                                                  36

    144MB       (1) 16M x 36   (1) 16M x 36   (1) 2M x 36    (1) 2M x 36

    160MB       (1) 16M x 36   (1) 16M x 36   (1) 4M x 36    (1) 4M x 36

    160MB       (1) 16M x 36   (1) 8M x 36    (1) 8M x 36    (1) 8M x 36

    192MB       (1) 16M x 36   (1) 16M x 36   (1) 16M x 36      NONE

    192MB       (1) 16M x 36   (1) 16M x 36   (1) 8M x 36    (1) 8M x 36

    194MB       (1) 16M x 36   (1) 16M x 36   (1) 16M x 36  (1) 512K x 36

    200MB       (1) 16M x 36   (1) 16M x 36   (1) 16M x 36   (1) 2M x 36

    208MB       (1) 16M x 36   (1) 16M x 36   (1) 16M x 36   (1) 4M x 36

    224MB       (1) 16M x 36   (1) 16M x 36   (1) 16M x 36   (1) 8M x 36

    256MB       (1) 16M x 36   (1) 16M x 36   (1) 16M x 36  (1) 16M x 36

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

     256KB        (4) 32K x 8     (4) 32K x 8    (1) 32K x 8

     256KB        (4) 64K x 8        NONE        (1) 32K x 8

     512KB        (4) 64K x 8     (4) 32K x 8    (1) 32K x 8

     512KB       (4) 128K x 8        NONE        (1) 32K x 8

      1MB        (4) 128K x 8    (4) 128K x 8    (1) 64K x 8

                        CACHE JUMPER CONFIGURATION

      Size              JP25               JP26               JP29

      256KB           pins 1 & 2        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

      256KB           pins 2 & 3        pins 1 & 2      pins 1 & 2 closed
                       closed             closed

      512KB           pins 1 & 2        pins 1 & 2      pins 2 & 3 closed
                       closed             closed

      512KB           pins 2 & 3        pins 1 & 2      pins 2 & 3 closed
                       closed             closed

       1MB            pins 1 & 2        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

                          CPU TYPE CONFIGURATION

      Type         JP30      JP31      JP32     JP33      JP34     JP36

     80486SX       3 & 4     Open     2 & 3     Open      Open     Open

    80486SX2       3 & 4     Open     2 & 3     Open      Open     Open

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

       U5S         Open      1 & 2,   1 & 2,    3 & 4     Open     Open
                             3 & 4    3 & 4

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

     CX486DX2      2 & 3     3 & 4    1 & 2,    2 & 3     Open     Open
     (3.6v)                           3 & 4

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

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

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

  AM486DX2 (5v)    3 & 4     3 & 4    1 & 2,    Open     2 & 3     Open
                                      3 & 4

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

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

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

    AM486DX4       3 & 4     3 & 4    1 & 2,    Open     1 & 2     1 & 2
                                      3 & 4

    80486DX4       3 & 4     3 & 4    1 & 2,    Open      Open     Open
                                      3 & 4

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

     Pentium       3 & 4     2 & 3    1 & 2,    1 & 2     Open     1 & 2
    Overdrive                         3 & 4

  Note: Pins designated should be in closed position.

                      CPU TYPE CONFIGURATION (CONT)

       Type          JP37        JP38       JP39       JP40       JP41

     80486SX         4 & 5       Open       Open     1 & 2, 3     Open
                                                       & 4

     80486SX2        4 & 5       Open       Open     1 & 2, 3     Open
                                                       & 4

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

       U5S           Open        Open       Open     1 & 2, 3     Open
                                                       & 4

     80486DX         4 & 5       Open       Open     1 & 2, 3     Open
                                                       & 4

  CX486DX2 (3.6v)    2 & 3      2 & 3      3 & 4     3 & 4, 5     Open
                                                       & 6

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

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

     AM486DX2        4 & 5       Open      1 & 2     1 & 2, 3     Open
     (3.45v)                                           & 4

  AM486DX2 (5v)      4 & 5       Open      1 & 2     1 & 2, 3     Open
                                                       & 4

     AM486DX2        4 & 5       Open      1 & 2     3 & 4, 5     2 & 3
                                                       & 6

     80486DX2        4 & 5       Open       Open     1 & 2, 3     Open
                                                       & 4

     AM486DX4        4 & 5       Open      1 & 2     1 & 2, 3     Open
     (3.45v)                                           & 4

     AM486DX4        4 & 5       Open      1 & 2     3 & 4, 5     2 & 3
                                                       & 6

     80486DX4        4 & 5       Open      1 & 2     3 & 4, 5     Open
                                                       & 6

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

      Pentium        1 & 2      1 & 2       Open     1 & 2, 3     Open
    Overdrive                                          & 4

  Note: Pins designated should be in closed position.

                      CPU TYPE CONFIGURATION (CONT)

       Type          JP42        JP43       JP44       JP45       JP46

     80486SX         2 & 3       Open      1 & 2      1 & 2       1 & 2

     80486SX2        2 & 3       Open      1 & 2      1 & 2       1 & 2

   CX486DX (5v)      2 & 3       Open       Open      1 & 2       1 & 2

       U5S           2 & 3       Open      1 & 2      2 & 3       4 & 5

     80486DX         2 & 3       Open      1 & 2      1 & 2       2 & 3

  CX486DX2 (3.6v)    2 & 3       Open       Open      1 & 2       1 & 2

  CX486DX2 (4v)      2 & 3       Open       Open      1 & 2       1 & 2

  CX486DX2 (5v)      2 & 3       Open       Open      1 & 2       1 & 2

     AM486DX2        2 & 3       Open      1 & 2      1 & 2       2 & 3
     (3.45v)

  AM486DX2 (5v)      2 & 3       Open      1 & 2      1 & 2       2 & 3

     AM486DX2        2 & 3       Open      4 & 5      1 & 2       2 & 3

     80486DX2        2 & 3       Open      1 & 2      1 & 2       2 & 3

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

     AM486DX4        2 & 3       Open      4 & 5      1 & 2       2 & 3

     80486DX4        2 & 3       Open      1 & 2      1 & 2       2 & 3

       P24D          1 & 2       Open      2 & 3      1 & 2       2 & 3

      Pentium        1 & 2       Open       Open      1 & 2       2 & 3
    Overdrive

  Note: Pins designated should be in closed position.

                          CPU SPEED CONFIGURATION

       Speed              JP14              JP21               JP22

       25MHz            pins 1 & 2          Open               Open
                         closed

       33MHz            pins 1 & 2         Closed             Closed
                         closed

       40MHz            pins 1 & 2         Closed              Open
                         closed

      50iMHz            pins 1 & 2          Open               Open
                         closed

      66iMHz            pins 1 & 2         Closed             Closed
                         closed

      75iMHz            pins 1 & 2          Open               Open
                         closed

      80iMHz            pins 1 & 2         Closed              Open
                         closed

      100iMHz           pins 1 & 2         Closed             Closed
                         closed

                       DRQ/DACK CONFIGURATION

   DRQ/DACK        JP8           JP9          JP10          JP11

     None         Open          Open          Open          Open

  DRQ3/DACK3     Closed         Open          Open         Closed

  DRQ7/DACK7      Open         Closed        Closed         Open

