
MECER CORPORATION

B800/B820 (REV. A)

Processor        80386DX/CX486DLC/80486SX/80487SX/80486DX/80486DX2
Processor Speed  20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         Unidentified
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       330mm x 218mm
I/O Options      None
NPU Options      80387DX

[Image]

                                CONNECTIONS

  Purpose                 Location      Purpose               Location

  External battery           JP2        Speaker             JP34 pins 6 -
                                                                 10

  External battery          JP31        Turbo LED          JP34 pins 11 -
                                                                 15

  Auxiliary keyboard        JP33        Turbo switch       JP34 pins 16 -
  connector                                                      17

  Power LED & keylock   JP34 pins 1 -   Reset switch       JP34 pins 19 -
                              5                                  20

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color               JP3              Open

      Monitor type select monochrome          JP3             Closed

     CMOS memory normal operation            JP6           pins 1 & 2
                                                              closed

      CMOS memory clear                       JP6           pins 2 & 3
                                                              closed

     Factory configured - do not             JP20             N/A
      alter

     Internal battery enabled                JP32            Closed

      Internal battery disabled               JP32             Open

     Factory configured - do not             JP41             N/A
      alter

              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) 1M x 9

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

                           CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TG1            TG2

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

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

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

                CACHE JUMPER CONFIGURATION (80386DX-40)

   Size     JP8A    JP8B     JP8C     JP8E     JP8F    JP12     JP13

   64KB    2 & 3    1 & 2    1 & 2   2 & 3    1 & 2    1 & 2    1 & 2

  128KB    1 & 2    2 & 3    2 & 3   1 & 2    1 & 2    1 & 2    1 & 2

  256KB    2 & 3    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

               CACHE JUMPER CONFIGURATION (80386DX-40 CONT)

   Size      JP30      JP40      W1A      W1B     W1C      W2A      W2C

   64KB      1 & 2     1 & 2,    2 & 3   2 & 3    2 & 3    2 & 3   2 & 3
                       7 & 8

   128KB     1 & 2     1 & 2,    2 & 3   2 & 3    2 & 3    2 & 3   2 & 3
                       7 & 8

   256KB     1 & 2     1 & 2,    2 & 3   2 & 3    2 & 3    2 & 3   2 & 3
                       7 & 8

  Note: Pins designated should be in the closed position.

             CACHE JUMPER CONFIGURATION (80386DX-40 CONT)

   Size     W2D      W2E      W2G     W2H      W3A      W3B      W4

   64KB    2 & 3    2 & 3    2 & 3   2 & 3    1 & 2    2 & 3    1 & 2

  128KB    2 & 3    2 & 3    2 & 3   2 & 3    1 & 2    2 & 3    1 & 2

  256KB    2 & 3    2 & 3    2 & 3   2 & 3    1 & 2    2 & 3    1 & 2

  Note: Pins designated should be in the closed position.

               CACHE JUMPER CONFIGURATION (CX486DLC-33)

   Size     JP8A    JP8B     JP8C     JP8E     JP8F    JP12     JP13

   64KB    2 & 3    1 & 2    1 & 2   2 & 3    1 & 2    1 & 2    1 & 2

  128KB    1 & 2    2 & 3    2 & 3   1 & 2    1 & 2    1 & 2    1 & 2

  256KB    2 & 3    2 & 3    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

              CACHE JUMPER CONFIGURATION (CX486DLC-33 CONT)

   Size      JP30      JP40      W1A      W1B     W1C      W2A      W2C

   64KB      1 & 2     1 & 2,    2 & 3   1 & 2    2 & 3    2 & 3   2 & 3
                       5 & 6

   128KB     1 & 2     1 & 2,    2 & 3   1 & 2    2 & 3    2 & 3   2 & 3
                       5 & 6

   256KB     1 & 2     1 & 2,    2 & 3   1 & 2    2 & 3    2 & 3   2 & 3
                       5 & 6

  Note: Pins designated should be in the closed position.

            CACHE JUMPER CONFIGURATION (CX486DLC-33 CONT)

   Size     W2D      W2E      W2G     W2H      W3A      W3B      W4

   64KB    2 & 3    2 & 3    2 & 3   2 & 3    1 & 2    1 & 2    2 & 3

  128KB    2 & 3    2 & 3    2 & 3   2 & 3    1 & 2    1 & 2    2 & 3

  256KB    2 & 3    2 & 3    2 & 3   2 & 3    1 & 2    1 & 2    2 & 3

  Note: Pins designated should be in the closed position.

                  CACHE JUMPER CONFIGURATION (80486SX-20)

  Size     JP8A    JP8B    JP8C    JP8E    JP8F    JP12    JP13     JP30

  64KB     2 & 3   1 & 2   1 & 2   2 & 3   1 & 2   2 & 3   2 & 3   2 & 3

  128KB    1 & 2   2 & 3   2 & 3   1 & 2   1 & 2   2 & 3   2 & 3   2 & 3

  256KB    2 & 3   1 & 2   1 & 2   1 & 2   2 & 3   2 & 3   2 & 3   2 & 3

  Note: Pins designated should be in the closed position.

               CACHE JUMPER CONFIGURATION (80486SX-20 CONT)

     Size           JP40          W1A        W1B        W1C        W2A

     64KB       1 & 2, 3 & 4,    1 & 2      1 & 2      1 & 2      1 & 2
                5 & 6, 7 & 8

    128KB       1 & 2, 3 & 4,    1 & 2      1 & 2      1 & 2      1 & 2
                5 & 6, 7 & 8

    256KB       1 & 2, 3 & 4,    1 & 2      1 & 2      1 & 2      1 & 2
                5 & 6, 7 & 8

  Note: Pins designated should be in the closed position.

               CACHE JUMPER CONFIGURATION (80486SX-20 CONT)

  Size     W2C      W2D     W2E     W2G     W2H      W3A     W3B     W4

  64KB     1 & 2   1 & 2   1 & 2    1 & 2   1 & 2   2 & 3   1 & 2   1 & 2

  128KB    1 & 2   1 & 2   1 & 2    1 & 2   1 & 2   2 & 3   1 & 2   1 & 2

  256KB    1 & 2   1 & 2   1 & 2    1 & 2   1 & 2   2 & 3   1 & 2   1 & 2

  Note: Pins designated should be in the closed position.

                CACHE JUMPER CONFIGURATION (80486SX-25)

   Size     JP8A    JP8B     JP8C     JP8E     JP8F    JP12     JP13

   64KB    2 & 3    1 & 2    1 & 2   2 & 3    1 & 2    2 & 3    2 & 3

  128KB    1 & 2    2 & 3    2 & 3   1 & 2    1 & 2    2 & 3    2 & 3

  256KB    2 & 3    1 & 2    1 & 2   1 & 2    2 & 3    2 & 3    2 & 3

  Note: Pins designated should be in the closed position.

             CACHE JUMPER CONFIGURATION (80486SX-25 CONT)

   Size     JP30    JP40      W1A     W1B      W1C      W2A      W2C

   64KB    2 & 3    1 & 2    1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  128KB    2 & 3    1 & 2    1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  256KB    2 & 3    1 & 2    1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

             CACHE JUMPER CONFIGURATION (80486SX-25 CONT)

   Size     W2D      W2E      W2G     W2H      W3A      W3B      W4

   64KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  128KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  256KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

                  CACHE JUMPER CONFIGURATION (80487SX-20)

  Size     JP8A    JP8B    JP8C    JP8E    JP8F    JP12    JP13     JP30

  64KB     2 & 3   1 & 2   1 & 2   2 & 3   1 & 2   1 & 2   1 & 2   2 & 3

  128KB    1 & 2   2 & 3   2 & 3   1 & 2   1 & 2   1 & 2   1 & 2   2 & 3

  256KB    2 & 3   1 & 2   1 & 2   1 & 2   2 & 3   1 & 2   1 & 2   2 & 3

  Note: Pins designated should be in the closed position.

               CACHE JUMPER CONFIGURATION (80487SX-20 CONT)

     Size           JP40           W1A       W1B        W1C        W2A

     64KB       1 & 2, 3 & 4,     1 & 2     1 & 2      1 & 2      1 & 2
                5 & 6, 7 & 8

    128KB       1 & 2, 3 & 4,     1 & 2     1 & 2      1 & 2      1 & 2
                5 & 6, 7 & 8

    256KB       1 & 2, 3 & 4,     1 & 2     1 & 2      1 & 2      1 & 2
                5 & 6, 7 & 8

  Note: Pins designated should be in the closed position.

               CACHE JUMPER CONFIGURATION (80487SX-20 CONT)

  Size     W2C      W2D     W2E     W2G     W2H      W3A     W3B     W4

  64KB     1 & 2   1 & 2   1 & 2    1 & 2   1 & 2   2 & 3   1 & 2   1 & 2

  128KB    1 & 2   1 & 2   1 & 2    1 & 2   1 & 2   2 & 3   1 & 2   1 & 2

  256KB    1 & 2   1 & 2   1 & 2    1 & 2   1 & 2   2 & 3   1 & 2   1 & 2

  Note: Pins designated should be in the closed position.

                CACHE JUMPER CONFIGURATION (80486DX-33)

   Size     JP8A    JP8B     JP8C     JP8E     JP8F    JP12     JP13

   64KB    2 & 3    1 & 2    1 & 2   2 & 3    1 & 2    1 & 2    1 & 2

  128KB    1 & 2    2 & 3    2 & 3   1 & 2    1 & 2    1 & 2    1 & 2

  256KB    2 & 3    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

             CACHE JUMPER CONFIGURATION (80486DX-33 CONT)

   Size     JP30    JP40      W1A     W1B      W1C      W2A      W2C

   64KB    1 & 2    5 & 6    1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  128KB    1 & 2    5 & 6    1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  256KB    1 & 2    5 & 6    1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

             CACHE JUMPER CONFIGURATION (80486DX-33 CONT)

   Size     W2D      W2E      W2G     W2H      W3A      W3B      W4

   64KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  128KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  256KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

                CACHE JUMPER CONFIGURATION (80486DX-50)

   Size     JP8A    JP8B     JP8C     JP8E     JP8F    JP12     JP13

   64KB    2 & 3    1 & 2    1 & 2   2 & 3    1 & 2    1 & 2    1 & 2

  128KB    1 & 2    2 & 3    2 & 3   1 & 2    1 & 2    1 & 2    1 & 2

  256KB    2 & 3    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

             CACHE JUMPER CONFIGURATION (80486DX-50 CONT)

   Size     JP30    JP40      W1A     W1B      W1C      W2A      W2C

   64KB    1 & 2    Open     1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  128KB    1 & 2    Open     1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  256KB    1 & 2    Open     1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

             CACHE JUMPER CONFIGURATION (80486DX-50 CONT)

   Size     W2D      W2E      W2G     W2H      W3A      W3B      W4

   64KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  128KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  256KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

               CACHE JUMPER CONFIGURATION (80486DX2-50)

   Size     JP8A    JP8B     JP8C     JP8E     JP8F    JP12     JP13

   64KB    2 & 3    1 & 2    1 & 2   2 & 3    1 & 2    1 & 2    1 & 2

  128KB    1 & 2    2 & 3    2 & 3   1 & 2    1 & 2    1 & 2    1 & 2

  256KB    2 & 3    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

              CACHE JUMPER CONFIGURATION (80486DX2-50 CONT)

   Size      JP30      JP40      W1A      W1B     W1C      W2A      W2C

   64KB      1 & 2     5 & 6,    1 & 2   1 & 2    1 & 2    1 & 2   1 & 2
                       7 & 8

   128KB     1 & 2     5 & 6,    1 & 2   1 & 2    1 & 2    1 & 2   1 & 2
                       7 & 8

   256KB     1 & 2     5 & 6,    1 & 2   1 & 2    1 & 2    1 & 2   1 & 2
                       7 & 8

  Note: Pins designated should be in the closed position.

            CACHE JUMPER CONFIGURATION (80486DX2-50 CONT)

   Size     W2D      W2E      W2G     W2H      W3A      W3B      W4

   64KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  128KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  256KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

               CACHE JUMPER CONFIGURATION (80486DX2-66)

   Size     JP8A    JP8B     JP8C     JP8E     JP8F    JP12     JP13

   64KB    2 & 3    1 & 2    1 & 2   2 & 3    1 & 2    1 & 2    1 & 2

  128KB    1 & 2    2 & 3    2 & 3   1 & 2    1 & 2    1 & 2    1 & 2

  256KB    2 & 3    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

            CACHE JUMPER CONFIGURATION (80486DX2-66 CONT)

   Size     JP30    JP40      W1A     W1B      W1C      W2A      W2C

   64KB    1 & 2    5 & 6    1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  128KB    1 & 2    5 & 6    1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  256KB    1 & 2    5 & 6    1 & 2   1 & 2    1 & 2    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

            CACHE JUMPER CONFIGURATION (80486DX2-66 CONT)

   Size     W2D      W2E      W2G     W2H      W3A      W3B      W4

   64KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  128KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  256KB    1 & 2    1 & 2    1 & 2   1 & 2    2 & 3    1 & 2    1 & 2

  Note: Pins designated should be in the closed position.

