
UNIDENTIFIED

SIS 486-471 VL BUS 5/3.3V

Processor   CX486S/80486SX/CX486DX/80486DX/80486DX2/80486DX4/Pentium
            Overdrive
Processor   20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set    SIS
Max. Onboard128MB
DRAM
Cache       64/128/256/512KB
BIOS        AMI
Dimensions  254mm x 220mm
I/O Options 32-bit VESA local bus slots (3), green PC connector
NPU Options None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  External battery            J1       Reset switch                J6

  Green PC connector          J2       Power LED & keylock         J7

  Turbo switch                J3       Break switch               JP26
                                       connector

  Turbo LED                   J4       32-bit VESA local bus   SL1 - SL3
                                       slots

  Speaker                     J5

                        USER CONFIGURABLE SETTINGS

                 Function                      Jumper         Position

     Turbo switch enabled                       J3          pins 1 & 2
                                                               closed

      Turbo switch disabled                      J3          pins 2 & 3
                                                               closed

      Use for break switch                       J3          pins 4 & 5
                                                               closed

     CMOS memory normal operation              JP16         pins 1 & 2
                                                               closed

      CMOS memory clear                         JP16         pins 2 & 3
                                                               closed

     Monitor type select                       JP17            Open
      VGA/EGA/monochrome

      Monitor type select CGA                   JP17           Closed

     CX486S2 CPU not installed                 JP18            Open

      CX486S2 CPU installed                     JP18           Closed

     RC pin for break switch                   JP19         pins 1 & 2
                                                               closed

      RC pin for RC                             JP19         pins 2 & 3
                                                               closed

     Factory configured - do not alter         JP20         pins 2 & 3
                                                               closed

     Factory configured - do not alter         JP23         pins 1 & 2
                                                               closed

     J3 set with pins open                     JP27           Closed

      J3 set with pins 4 & 5 closed             JP27            Open

     Factory configured - do not alter         JP43         pins 1 & 2
                                                               closed

                   DRAM CONFIGURATION (TABLE 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

      34MB         (4) 256K x 9    (1) 256K x 36     (1) 8M x 36

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

      48MB          (4) 4M x 9      (1) 8M x 36         NONE

      48MB          (4) 4M x 9      (1) 8M x 36         NONE

      52MB          (4) 1M x 9      (1) 4M x 36      (1) 8M x 36

      64MB          (4) 4M x 9      (1) 4M x 36      (1) 8M x 36

      64MB         (4) 16M x 9          NONE            NONE

      68MB          (4) 1M x 9      (1) 8M x 36      (1) 8M x 36

      80MB          (4) 4M x 9      (1) 8M x 36      (1) 8M x 36

      96MB         (4) 16M x 9      (1) 8M x 36         NONE

      128MB        (4) 16M x 9      (1) 8M x 36      (1) 8M x 36

                   DRAM CONFIGURATION (TABLE 2)

      Size            Bank 0           Bank 1          Bank 2

       1MB        (1) 256K x 36         NONE            NONE

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

       4MB         (1) 1M x 36          NONE            NONE

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

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

       8MB         (1) 2M x 36          NONE            NONE

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

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

      16MB         (1) 4M x 36          NONE            NONE

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

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

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

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

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

      32MB         (1) 8M x 36          NONE            NONE

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

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

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

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

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

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

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

      128MB        (1) 8M x 36      (1) 8M x 36      (4) 16M x 9

                  DRAM JUMPER CONFIGURATION

    Configuration            JP36                 JP37

       Table 1         pins 1 & 2 closed   pins 2 & 3 closed

       Table 2         pins 2 & 3 closed   pins 1 & 2 closed

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

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

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

     256KB        (4) 32K x 8     (4) 32K x 8    (1) 16K x 8

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

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

                        CACHE JUMPER CONFIGURATION

   Size      JP1     JP2      JP3     JP4      JP33     JP34      JP35

   64KB     2 & 3   1 & 2     2 &    1 & 2    1 & 2    1 & 2      Open
                              3, 4
                              & 5

  128KB     1 & 2   1 & 2     1 &    1 & 2    2 & 3    2 & 3      Open
                              2, 3
                              & 4

  256KB     2 & 3   Open      2 &     Open    2 & 3    2 & 3     Closed
                              3, 4
                              & 5

  256KB     2 & 3   2 & 3     2 &    1 & 2    2 & 3    2 & 3      Open
                              3, 4
                              & 5

  512KB     1 & 2   2 & 3     1 &    2 & 3    2 & 3    2 & 3      Open
                              2, 3
                              & 4

  Note: Pins designated should be in the closed position.

              CPU TYPE CONFIGURATION

      Type             JP30             JP31

      P24D            Closed           Closed

  All other CPU        Open             Open

                          CPU TYPE CONFIGURATION

      Type          JP8         JP9         JP10       JP11       JP12

    CX486SX        2 & 3      Closed       2 & 3       Open      2 & 3, 4
                                                                   & 5

    80486SX        2 & 3       Open        2 & 3       Open       Open

    SLE486SX       2 & 3       Open        2 & 3       Open       3 & 4

    CX486DX        1 & 2      Closed       2 & 3      3 & 4       2 & 3

    SLE486DX       1 & 2      Closed       2 & 3      3 & 4       3 & 4

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

   SLE486DX2       1 & 2      Closed       2 & 3      3 & 4       3 & 4

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

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

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

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

      Type         JP13        JP14        JP15        JP21        JP22

    CX486SX        Open       1 & 2, 3     2 & 3      1 & 2       2 & 3
                                & 4

    80486SX        Open        Open        Open       2 & 3       1 & 2

    SLE486SX       1 & 2       2 & 3       4 & 5      2 & 3       1 & 2

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

    SLE486DX       1 & 2       2 & 3       4 & 5      2 & 3       1 & 2

    80486DX        Open        Open        Open       2 & 3       1 & 2

   SLE486DX2       1 & 2       2 & 3       4 & 5      2 & 3       1 & 2

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

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

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

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

      Type         JP24       JP25        JP32       JP41         JP42

    CX486SX        2 & 3      2 & 3      2 & 3      2 & 3, 5     Closed
                                                      & 6

    80486SX        Open       Open       1 & 2      2 & 3, 5     Closed
                                                      & 6

    SLE486SX       Open       Open       2 & 3      2 & 3, 5     Closed
                                                      & 6

    CX486DX        2 & 3      2 & 3      2 & 3      2 & 3, 5     Closed
                                                      & 6

    SLE486DX       Open       Open       2 & 3      2 & 3, 5     Closed
                                                      & 6

    80486DX        Open       Open       1 & 2      2 & 3, 5     Closed
                                                      & 6

   SLE486DX2       Open       Open       2 & 3      2 & 3, 5     Closed
                                                      & 6

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

      P24D         Open       1 & 2      2 & 3      2 & 3, 5     Closed
                                                      & 6

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

  Note: Pins designated should be in the closed position.

                         CPU VOLTAGE CONFIGURATION

               Voltage                                JP41

                3.3v                        pins 1 & 2, 4 & 5 closed

             5.0v (DX4)                     pins 2 & 3, 5 & 6 closed

            Note: If Q4, Q5, and Q6 are installed or Q6 only installed,
            set JP41 with pins 1 & 2, 4 & 5 closed.

  CPU SPEED CONFIGURATION (U16-AVASEM/AV9107-03/KTS0147C)

     Speed           JP5            JP6            JP7

     20MHz         Closed          Open          Closed

     25MHz         Closed         Closed          Open

     33MHz          Open          Closed         Closed

     40MHz         Closed          Open           Open

    50iMHz         Closed         Closed          Open

     50MHz          Open           Open          Closed

    66iMHz          Open          Closed         Closed

  CPU SPEED CONFIGURATION (U17-MX8315)

  Speed       JP5       JP6       JP7

  20MHz      Open      Open       Open

  25MHz      Open     Closed      Open

  33MHz     Closed    Closed     Closed

  40MHz      Open     Closed     Closed

  50iMHz     Open     Closed      Open

  50MHz     Closed     Open       Open

  66iMHz    Closed    Closed     Closed

      VESA WAIT STATE CONFIGURATION

     Wait states             JP28

    0 wait states     pins 1 & 2 closed

    1 wait state      pins 2 & 3 closed

         BUS SPEED CONFIGURATION

      CPU speed              JP29

      <= 33MHz        pins 1 & 2 closed

       > 33MHz        pins 2 & 3 closed

