
UNIDENTIFIED

MB4D33L

Processor        80386DX/TI486DLC/80486SX/80486DX/80486DX2
Processor Speed  20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         OPTI
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI/Award
Dimensions       254mm x 218mm
I/O Options      32-bit VESA local bus slots (2)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            JP4       Turbo switch              JP18

  Speaker                    JP15       Reset switch              JP25

  Power LED & keylock        JP16       32-bit VESA local      SL1 & SL2
                                        bus slots

  Turbo LED                  JP17

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     I/O bus speed select CLKIN/4            JP5             Closed

      I/O bus speed select CLKIN/5            JP5              Open

     Monitor type select color               JP6             Closed

      Monitor type select monochrome          JP6              Open

     CMOS memory normal operation            JP14          pins 1 & 2
                                                              closed

      CMOS memory clear                       JP14          pins 2 & 3
                                                              closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

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

      16MB        (4) 4M x 9         NONE

      20MB        (4) 1M x 9      (4) 4M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

                    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               JP1               JP2                 JP3

      64KB            pins 2 & 3        pins 2 & 3      pins 2 & 3 closed
                       closed             closed

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

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

                          CPU TYPE CONFIGURATION

      Type           JP7            JP8           JP11           JP13

    80386DX          Open          Open        pins 2 & 3        Open
                                                 closed

    TI486DLC        Closed        Closed       pins 2 & 3        Open
                                                 closed

    80486SX          Open          Open        pins 1 & 2       Closed
                                                 closed

    80486DX          Open          Open        pins 1 & 2       Closed
                                                 closed

    80486DX2         Open          Open        pins 1 & 2       Closed
                                                 closed

             CPU TYPE CONFIGURATION (80486 ONLY)

        Type                 JP9                  JP10

       80486SX         pins 2 & 3 closed   pins 2 & 3 closed

       80486DX         pins 1 & 2 closed   pins 1 & 2 closed

      80486DX2         pins 1 & 2 closed   pins 1 & 2 closed

                   CPU SPEED CONFIGURATION (80386 ONLY)

  Speed     JP12     JP19     JP20    JP21     JP22      JP23      JP24

  25MHz     1 & 2    Open     2 & 3   1 & 2    Open     Closed     Open

  33MHz     1 & 2    Open     2 & 3   1 & 2    Open      Open     Closed

  40MHz     1 & 2   Closed    2 & 3   1 & 2   Closed     Open      Open

  Note: Pins designated should be in the closed position.

                   CPU SPEED CONFIGURATION (80486 ONLY)

   Speed    JP12     JP19     JP20    JP21     JP22      JP23      JP24

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

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

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

   40MHz    2 & 3   Closed    2 & 3   2 & 3   Closed    Closed    Closed

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

   50MHz    2 & 3   Closed    2 & 3   2 & 3   Closed    Closed     Open

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

  Note: Pins designated should be in the closed position.

            VESA SLOT ID CONFIGURATION

      Type             jp26             jp27

  80386 serials        Open            Closed

  80486 serials       Closed            Open

