
UNIDENTIFIED

SA-486 VL-BUS M.B. REV. V2C

Processor   CX486SX/80486SX/80487SX/AMD486DXLV/CX486DX/80486DX/80486DX2/
            80486DX4/Pentium Overdrive
Processor   20/25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set    ALI
Max.        128MB
Onboard
DRAM
Cache       128/256/512/1024KB
BIOS        Phoenix
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

  Power LED & keylock        CN1       Green PC connector         JG7

  Speaker                    CN2       Green PC connector         JG8

  Reset switch               CN3       Green PC connector         JG9

  Turbo switch               CN4       Green PC connector         JG10

  Turbo LED                  CN5       Green PC connector         JG11

  External battery           CN6       32-bit VESA local bus   SL1 - SL3
                                       slots

  SMI connector              JG6

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Turbo switch enabled                    CN4             Closed

      Turbo switch disabled                   CN4              Open

     Factory configured - do not             JC12             Open
      alter

     Factory configured - do not             JC15             Open
      alter

     Factory configured - do not             JG16             Open
      alter

     Factory configured - do not              X2              Open
      alter

                        DRAM CONFIGURATION

      Size            Bank 0           Bank 1          Bank 2

       1MB         (4) 256K x 9         NONE            NONE

       2MB             NONE             NONE        (1) 512K x 36

       2MB             NONE        (1) 512K x 36        NONE

       4MB             NONE         (1) 1M x 36         NONE

       4MB          (4) 1M x 9          NONE            NONE

       4MB             NONE             NONE         (1) 1M x 36

       5MB         (4) 256K x 9     (1) 1M x 36         NONE

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

       8MB             NONE         (1) 2M x 36         NONE

       8MB             NONE             NONE         (1) 2M x 36

      16MB          (4) 4M x 9          NONE            NONE

      16MB             NONE         (1) 4M x 36         NONE

      16MB             NONE             NONE         (1) 4M x 36

      17MB         (4) 256K x 9     (1) 4M x 36         NONE

      20MB          (4) 4M x 9      (1) 1M x 36         NONE

      20MB          (4) 1M x 9      (1) 4M x 36         NONE

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

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

      32MB             NONE         (1) 8M x 36         NONE

      32MB             NONE             NONE         (1) 8M x 36

      32MB          (4) 4M x 9      (1) 4M x 36         NONE

      64MB             NONE         (1) 16M x 36        NONE

      64MB             NONE             NONE        (1) 16M x 36

      64MB         (4) 16M x 9          NONE            NONE

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

                            CACHE CONFIGURATION

       Size             Bank 0             Bank 1              TAG

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

      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) 64K x 8        (1) 32K x 8

      512KB          (4) 128K x 8           NONE           (1) 64K x 8

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

                        CACHE JUMPER CONFIGURATION

    Size          JS1            JS2             JS3             JS4

   128KB       pins 1 & 2     pins 1 & 2      pins 1 & 2      pins 1 & 3
                closed          closed         closed          closed

   256KB       pins 2 & 3     pins 1 & 2      pins 1 & 2      pins 2 & 4
                closed          closed         closed          closed

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

   512KB       pins 2 & 3     pins 2 & 3      pins 1 & 2      pins 3 & 5
                closed          closed         closed          closed

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

    1MB        pins 2 & 3     pins 2 & 3      pins 2 & 3      pins 4 & 6
                closed          closed         closed          closed

                          CPU TYPE CONFIGURATION

      Type        JC1     JC2    JC3    JC4     JC5      JC6       JC20

    CX486SX       Open    2 &     1 &    1 &   2 & 3    Open       Open
                           3      2      2

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

    80487SX       1 & 2   1 &     1 &    1 &   Open    Closed      Open
                          2, 3    2      2
                          & 4

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

    AMD486DX      2 & 3   1 &     1 &    1 &   Open    Closed      Open
                          2, 3    2      2
                          & 4

  80486DX/DX2     2 & 3   1 &     1 &    1 &   Open    Closed     Closed
                          2, 3    2      2
                          & 4

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

    P4S/P24S      2 & 3   1 &     1 &    1 &   Open    Closed     Closed
                          2, 3    2      2
                          & 4

      P23S        Open    2 &     1 &    1 &   Open    Closed      Open
                           3      2      2

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

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

     Type         JC22     JG2    JG3     JG4     JG5      JG19     JG20

    CX486SX      Closed     1 &    1 &    1 &    1 & 2    Closed    1 & 2
                            2      2       2

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

    80487SX       Open      1 &    1 &    1 &    1 & 2     Open     2 & 3
                            2      2       2

    CX486DX      Closed     1 &    1 &    1 &    1 & 2    Closed    1 & 2
                            2      2       2

   AMD486DX       Open      2 &    2 &    2 &    2 & 3     Open     Open
                            3      3       3

  80486DX/DX2     Open      1 &    1 &    1 &    1 & 2     Open     Open
                            2      2       2

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

   P4S/P24S       Open      2 &    2 &    2 &    2 & 3     Open     2 & 3
                            3      3       3

     P23S         Open      2 &    2 &    2 &    2 & 3     Open     2 & 3
                            3      3       3

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

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

        Type                JC7               JC8               JC9

       CX486SX           pins 2 & 3        pins 1 & 2        pins 2 & 3
                           closed            closed           closed

       CX486DX           pins 1 & 2        pins 1 & 2        pins 2 & 3
                           closed            closed           closed

   80486DX/DX2/DX4       pins 1 & 2        pins 1 & 2        pins 1 & 2
                           closed            closed           closed

  Pentium Overdrive      pins 1 & 2        pins 2 & 3        pins 1 & 2
                           closed            closed           closed

                          CPU SPEED CONFIGURATION

    Speed           JF1            JF2            JF3            JG13

    20MHz        pins 1 & 2     pins 2 & 3     pins 2 & 3     pins 1 & 2
                  closed         closed         closed          closed

    25MHz        pins 2 & 3     pins 1 & 2     pins 2 & 3        Open
                  closed         closed         closed

    33MHz        pins 2 & 3     pins 2 & 3     pins 1 & 2        Open
                  closed         closed         closed

    40MHz        pins 1 & 2     pins 2 & 3     pins 2 & 3     pins 1 & 2
                  closed         closed         closed          closed

    50iMHz       pins 2 & 3     pins 1 & 2     pins 2 & 3        Open
                  closed         closed         closed

    50MHz        pins 2 & 3     pins 1 & 2     pins 2 & 3        Open
                  closed         closed         closed

    66iMHz       pins 2 & 3     pins 2 & 3     pins 1 & 2        Open
                  closed         closed         closed

              CPU SPEED CONFIGURATION (CONT)

  Speed      JG14      JG15       JC10      JC11      JC13

  20MHz      Open      Open      1 & 2     1 & 2     1 & 2

  25MHz      1 & 2     Open      1 & 2     1 & 2     1 & 2

  33MHz      Open      1 & 2     1 & 2     1 & 2     1 & 2

  40MHz      Open      Open      2 & 3     2 & 3     2 & 3

  50iMHz     1 & 2     Open      1 & 2     1 & 2     1 & 2

  50MHz      1 & 2     Open      2 & 3     2 & 3     2 & 3

  66iMHz     Open      1 & 2     1 & 2     1 & 2     1 & 2

  Note: Pins designated should be in the closed position.

                CPU SPEED CONFIGURATION (DX4)

        Speed                JX3                  JX4

         2x            pins 2 & 3 closed          Open

        2.5x                 Open                Closed

         3x            pins 1 & 2 closed          Open

                         CPU VOLTAGE CONFIGURATION

         Voltage                   JX1                      JX2

          3.3v              pins 2 & 3 closed               Open

          3.45v             pins 1 & 2 closed               Open

           5v                      Open               pins 1 & 2, 3 & 4
                                                           closed

  BUS SPEED CONFIGURATION

  CPU speed         J1

   <=33MHz         Open

    >33MHz        Closed

  VESA WAIT STATE CONFIGURATION

   Wait states          J2

  0 wait states        Open

  1 wait state        Closed

