
SOYO TECHNOLOGY CO., LTD.

SY-027 B2/B5

Processor  80486SX/SL80486SX/CX486DX/U5/AM486DXL/80486DX/SL80486DX/
           CX486DX2/AM486DX2/AM486DXL2/80486DX2/SL80486DX2/AM486DX4/ 80486DX4/Pentium
           Overdrive
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/80(internal)100(internal)MHz
Speed
Chip Set   Unidentified
Max.       64MB
Onboard
DRAM
Cache      128/256
BIOS       Award
Dimensions 220mm x 220mm
I/O        32-bit PCI slots (4), green PC connector
Options
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  IDE interface              J1        Turbo switch              J21

  Power LED & keylock       J17        Turbo LED                 J22

  Speaker                   J18        IDE interface LED         JP28

  Reset switch              J19        Green PC connector        JW6

  External battery          J20        32-bit PCI slots       PCI1 - PCI4

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not             JP32            Closed
      alter

     CMOS memory normal operation            JP33             Open

      CMOS memory clear                       JP33            Closed

     Factory configured - do not             JP65             Open
      alter

  Note: The location of JP32 is unidentified.

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       2MB        (1) 512K x 36         NONE

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

       4MB         (1) 1M x 36          NONE

       6MB         (1) 1M x 36     (1) 512K x 36

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

       8MB         (1) 2M x 36          NONE

      10MB         (1) 2M x 36     (1) 512K x 36

      12MB         (1) 2M x 36      (1) 1M x 36

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

      16MB         (1) 4M x 36          NONE

      18MB         (1) 4M x 36     (1) 512K x 36

      20MB         (1) 4M x 36      (1) 1M x 36

      24MB         (1) 4M x 36      (1) 2M x 36

      32MB         (1) 4M x 36      (1) 4M x 36

      32MB         (1) 8M x 36          NONE

      34MB         (1) 8M x 36     (1) 512K x 36

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

      40MB         (1) 8M x 36      (1) 2M x 36

      48MB         (1) 8M x 36      (1) 4M x 36

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

            CACHE CONFIGURATION

     Size          Bank 0          TAG

     128KB       (4) 32K x 8   (1) 8K x 8

     256KB       (4) 64K x 8   (1) 32K x 8

        CACHE JUMPER CONFIGURATION

        Size                 JP26

        128KB                Open

        256KB         pins 1 & 2 closed

                          CPU TYPE CONFIGURATION

     Type        JP6      JP9      JP10       JP13      JP23       JP24

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

  SL80486SX     2 & 3    2 & 3     2 & 3     2 & 3      1 & 2     1 & 2

   CX486DX      1 & 2    1 & 2     1 & 2     1 & 2      1 & 2     2 & 3

      U5        2 & 3    2 & 3     2 & 3     2 & 3      2 & 3     1 & 2

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

   AM486DXL     2 & 3    2 & 3     2 & 3     2 & 3      2 & 3     1 & 2

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

   CX486DX2     1 & 2    1 & 2     1 & 2     1 & 2      1 & 2     2 & 3

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

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

  AM486DXL2     2 & 3    2 & 3     2 & 3     2 & 3      2 & 3     1 & 2

  SL80486DX2    2 & 3    2 & 3     2 & 3     2 & 3      1 & 2     1 & 2

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

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

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

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

  Note: Pins designated should be in closed position.

                      CPU TYPE CONFIGURATION (CONT)

     Type       JP52       JP53       JP54      JP55      JP56     JP57

   80486SX      Open       Open       Open      Open      Open     Open

  SL80486SX     Open       Open       Open      Open     1 & 2     Open

   CX486DX      2 & 3      Open       Open      1 & 2    1 & 2     2 & 3

      U5        3 & 4      Open       Open      Open     2 & 3     Open

   80486DX      Open       Open       Open      Open      Open     Open

   AM486DXL     3 & 4      Open       Open      Open     2 & 3     Open

  SL80486DX     Open       Open       Open      Open     1 & 2     Open

   CX486DX2     2 & 3      Open       Open      1 & 2    1 & 2     2 & 3

   AM486DX2     Open       Open       Open      Open      Open     Open

   80486DX2     Open       Open       Open      Open      Open     Open

  AM486DXL2     3 & 4      Open       Open      Open     2 & 3     Open

  SL80486DX2    Open       Open       Open      Open     1 & 2     Open

   AM486DX4     Open       Open       Open      Open      Open     Open

   80486DX4     Open       Open       Open      Open     1 & 2     Open

     P24D       Open      Closed     Closed     Open     1 & 2     Open

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

  Note: Pins designated should be in closed position.

                      CPU TYPE CONFIGURATION (CONT)

      Type        JP58     JP59       JP60      JP62     JP63      JP64

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

   SL80486SX     1 & 2     2 & 3,     Open      Open     2 & 3     3 &4
                           4 & 5

    CX486DX      2 & 3     1 & 2,     Open      3 & 4    1 & 2,    3 &4
                           3 & 4                         3 & 4

       U5         Open     Open       Open      1 & 2,   2 & 3     1 & 2
                                                3 & 4

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

    AM486DXL      Open     Open       Open      1 & 2,   1 & 2,    1 & 2
                                                3 & 4    3 & 4

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

    CX486DX2     2 & 3     1 & 2,     Open      3 & 4    1 & 2,    3 &4
                           3 & 4                         3 & 4

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

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

   AM486DXL2      Open     Open       Open      1 & 2,   1 & 2,    1 & 2
                                                3 & 4    3 & 4

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

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

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

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

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

  Note: Pins designated should be in closed position.

                       CPU SPEED CONFIGURATION

               Speed                              JP22

               25MHz                       pins 1 & 2 closed

               33MHz                pins 1 & 2, 3 & 4, 5 & 6 closed

               40MHz                    pins 1 & 2, 3 & 4 closed

              50iMHz                       pins 1 & 2 closed

               50MHz                       pins 5 & 6 closed

              66iMHz                pins 1 & 2, 3 & 4, 5 & 6 closed

              75iMHz                       pins 1 & 2 closed

              80iMHz                    pins 1 & 2, 3 & 4 closed

              100iMHz                      pins 5 & 6 closed

   CPU SPEED CONFIGURATION (AM486 ONLY)

        Speed                JP61

         2x           pins 2 & 3 closed

         3x           pins 1 & 2 closed

  CPU SPEED CONFIGURATION (80486DX4 ONLY)

        Speed                  JP51

          2x            pins 2 & 3 closed

         2.5x           pins 1 & 2 closed

          3x                   Open

