
UNIDENTIFIED

VL/ISA-PB486P3

Processor    80486SX/CX486DX/80486DX/80486DX2/80486DX4/P24D/Pentium
             Overdrive
Processor    25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set     Unidentified
Max. Onboard 64MB
DRAM
Cache        64/128/256KB
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

  Turbo switch        CN1 (pins 1 -   Green PC connector         JP32
                           2)

  Turbo LED           CN1 (pins 3 -   Reset switch                S1
                           4)

  Power LED &              J2         32-bit VESA local       SL1 - SL3
  keylock                             bus slots

  Speaker                 JP18

                        USER CONFIGURABLE SETTINGS

                Function                    Jumper           Position

     CPU voltage select 5v                   JP1             Closed

      CPU voltage select 3.3v                 JP1              Open

     CMOS memory normal operation           JP26           pins 2 & 3
                                                              closed

      CMOS memory clear                      JP26           pins 1 & 2
                                                              closed

                        DRAM CONFIGURATION

      Size            Bank 0           Bank 1          Bank 2

       1MB         (4) 256K x 9         NONE            NONE

       2MB             NONE        (1) 512K x 36        NONE

       4MB          (4) 1M x 9          NONE            NONE

       4MB             NONE         (1) 1M x 36         NONE

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

       6MB             NONE        (1) 512K x 36     (1) 1M x 36

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

       8MB             NONE         (1) 2M x 36         NONE

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

      10MB             NONE        (1) 512K x 36     (1) 2M x 36

      12MB          (4) 1M x 9          NONE         (1) 2M x 36

      12MB             NONE         (1) 1M x 36      (1) 2M x 36

      16MB          (4) 4M x 9          NONE            NONE

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

      16MB             NONE         (1) 4M x 36         NONE

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

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

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

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

      32MB             NONE         (1) 8M x 36         NONE

      64MB             NONE         (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      (4) 32K x 8    (4) 32K x 8    (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size              JP10               JP11               JP13

      64KB              Open               Open         pins 2 & 3 closed

      128KB             Open              Closed        pins 1 & 2 closed

      256KB            Closed             Closed        pins 2 & 3 closed

                          CPU TYPE CONFIGURATION

       Type           JP3         JP4         JP5       JP6        JP7

     80486SX         Open        Open        Open      1 & 2      Open

    SL80486SX        Open        Open        Open      1 & 2      Open

   CX486DX (1x)      1 & 2       Open        2 & 3     2 & 3      Open

   CX486DX (2x)      1 & 2       Open        2 & 3     2 & 3      Open

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

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

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

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

  80486DX4 (2x)      1 & 2       Open        2 & 3     1 & 2      Open

  80486DX4 (2.5x)    1 & 2       Open        2 & 3     1 & 2      Open

  80486DX4 (3x)      1 & 2       Open        2 & 3     1 & 2      Open

    P24D (WB)        1 & 2       Open        2 & 3     1 & 2      1 & 2

    P24D (WT)        1 & 2       Open        2 & 3     1 & 2      2 & 3

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

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

      Type          JP8        JP9        JP12       JP22        JP23

     80486SX       2 & 3      Open        Open       1 & 2       Open

    SL80486SX      2 & 3      Open        Open       1 & 2       Open

  CX486DX (1x)     1 & 2      1 & 2       Open       1 & 2       Open

  CX486DX (2x)     1 & 2      1 & 2       Open       1 & 2       Open

     80486DX       1 & 2      Open        Open       1 & 2       Open

    SL80486DX      1 & 2      Open        Open       1 & 2       Open

    80486DX2       1 & 2      Open        Open       1 & 2       Open

   SL80486DX2      1 & 2      Open        Open       1 & 2       Open

  80486DX4 (2x)    1 & 2      Open        Open       1 & 2       Open

     80486DX4      1 & 2      Open        Open       1 & 2       Open
     (2.5x)

  80486DX4 (3x)    1 & 2      Open        Open       1 & 2       Open

    P24D (WB)      1 & 2      2 & 3      Closed      1 & 2      Closed

    P24D (WT)      1 & 2      2 & 3      Closed      1 & 2      Closed

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

  Note: Pins designated should be in the closed position.

                      CPU TYPE CONFIGURATION (CONT)

      Type         JP24      JP25      JP27     JP36      JP40      JP43

    80486SX        Open      Open      Open    1 & 2     Closed     Open

   SL80486SX      Closed    Closed     Open    2 & 3     Closed     Open

  CX486DX (1x)     Open      Open      1 & 2   1 & 2     Closed     Open

  CX486DX (2x)     Open      Open      2 & 3   1 & 2     Closed     Open

    80486DX        Open      Open      Open    1 & 2     Closed     Open

   SL80486DX      Closed    Closed     Open    2 & 3     Closed     Open

    80486DX2       Open      Open      Open    1 & 2     Closed     Open

   SL80486DX2     Closed    Closed     Open    2 & 3     Closed     Open

    80486DX4      Closed    Closed     Open    2 & 3     Closed    1 & 2
      (2x)

    80486DX4      Closed    Closed     Open    2 & 3     Closed    2 & 3
     (2.5x)

    80486DX4      Closed    Closed     Open    2 & 3     Closed     Open
      (3x)

   P24D (WB)      Closed    Closed     Open    2 & 3     Closed     Open

   P24D (WT)      Closed    Closed     Open    2 & 3     Closed     Open

     Pentium       Open      Open      Open    1 & 2     Closed     Open
   Overdrive

  Note: Pins designated should be in the closed position.

   CPU SPEED CONFIGURATION

  Speed      JP38      JP39

  25MHz      Open     Closed

  33MHz     Closed     Open

  40MHz      Open      Open

  50iMHz     Open     Closed

  50MHz     Closed    Closed

  66iMHz    Closed     Open

  VESA WAIT STATE CONFIGURATION

   Wait states         JP33

  0 wait states        Open

  1 wait state        Closed

  BUS SPEED CONFIGURATION

  CPU speed        JP34

   <= 33MHz        Open

   > 33MHz        Closed

