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       # MECER CORPORATION
       
          B815B (VER. B)
       
          Processor    80386DX/CX486DLC/CX486M6/80486SX/80486DX/80486DX2 
          Processor    25/33/40/50(internal)/50/66(internal)MHz          
          Speed        
          Chip Set     Unidentified                                      
          Max. Onboard 128MB                                             
          DRAM         
          Cache        128/256KB                                         
          BIOS         AMI                                               
          Dimensions   254mm x 218mm                                     
          I/O Options  None                                              
          NPU Options  80387DX                                           
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose             | Location  | Purpose      | Location  |
          |---------------------+-----------+--------------+-----------|
          | Auxiliary keyboard  |    JP1    | Turbo LED    | JP27 pins |
          | connector           |           |              |  11 - 12  |
          |---------------------+-----------+--------------+-----------|
          | External battery    |   JP12    | Turbo switch | JP27 pins |
          |                     |           |              |  16 - 17  |
          |---------------------+-----------+--------------+-----------|
          | Power LED & keylock | JP27 pins | Reset switch | JP27 pins |
          |                     |   1 - 5   |              |  19 - 20  |
          |---------------------+-----------+--------------+-----------|
          | Speaker             | JP27 pins |              |           |
          |                     |  7 - 10   |              |           |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function               | Jumper |  Position  |
          |--------------------------------------+--------+------------|
          | » | Monitor type select monochrome   |  JP10  | pins 1 & 2 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          |   | Monitor type select color        |  JP10  | pins 2 & 3 |
          |   |                                  |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Battery enabled                  |  JP13  |   Closed   |
          |---+----------------------------------+--------+------------|
          |   | Battery disabled                 |  JP13  |    Open    |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  JP17  |    N/A     |
          |   | alter                            |        |            |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  JP18  |    N/A     |
          |   | alter                            |        |            |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  JP21  |    N/A     |
          |   | alter                            |        |            |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  JP22  |    N/A     |
          |   | alter                            |        |            |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  JP28  | pins 1 & 2 |
          |   | alter                            |        |   closed   |
          |---+----------------------------------+--------+------------|
          | » | Factory configured - do not      |  JP33  | pins 2 & 3 |
          |   | alter                            |        |   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        |
          |------------------+--------------------+--------------------|
          |       17MB       |    (4) 256K x 9    |     (4) 4M x 9     |
          |------------------+--------------------+--------------------|
          |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
          |------------------+--------------------+--------------------|
          |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
          |------------------+--------------------+--------------------|
          |       64MB       |    (4) 16M x 9     |        NONE        |
          |------------------+--------------------+--------------------|
          |       65MB       |    (4) 256K x 9    |    (4) 16M x 9     |
          |------------------+--------------------+--------------------|
          |       68MB       |     (4) 1M x 9     |    (4) 16M x 9     |
          |------------------+--------------------+--------------------|
          |       80MB       |     (4) 4M x 9     |    (4) 16M x 9     |
          |------------------+--------------------+--------------------|
          |      128MB       |    (4) 16M x 9     |    (4) 16M x 9     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    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  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |       Size        |       JP24        |        JP25        |
          |-------------------+-------------------+--------------------|
          |       128KB       |       Open        | pins 2 & 3 closed  |
          |-------------------+-------------------+--------------------|
          |       256KB       |      Closed       | pins 1 & 2 closed  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |        Type         |      J1      |  JP2  |  JP3  |  JP4  |
          |---------------------+--------------+-------+-------+-------|
          | 80386DX-40 (80MHz)  |    6 & 8     | 2 & 3 | 1 & 2 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | CX486DLC-40 (80MHz) |    6 & 8     | 2 & 3 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | CX486M6-33 (33MHz)  |    5 & 7     | 2 & 3 | 2 & 3 | 1 & 2 |
          |---------------------+--------------+-------+-------+-------|
          | CX486M6-33 (66MHz)  |    1 & 2     | 2 & 3 | 2 & 3 | 1 & 2 |
          |---------------------+--------------+-------+-------+-------|
          | CX486M6-40 (40MHz)  | 1 & 2, 3 & 4 | 2 & 3 | 2 & 3 | 1 & 2 |
          |---------------------+--------------+-------+-------+-------|
          | CX486M6-33 (33MHz)  |    5 & 7     | 2 & 3 | 2 & 3 | 1 & 2 |
          |         C6          |              |       |       |       |
          |---------------------+--------------+-------+-------+-------|
          | CX486M6-33 (66MHz)  |    1 & 2     | 2 & 3 | 2 & 3 | 1 & 2 |
          |         C6          |              |       |       |       |
          |---------------------+--------------+-------+-------+-------|
          | CX486M6-40 (40MHz)  | 1 & 2, 3 & 4 | 2 & 3 | 2 & 3 | 1 & 2 |
          |         C6          |              |       |       |       |
          |---------------------+--------------+-------+-------+-------|
          | 80486SX-25 (25MHz)  | 3 & 4, 5 & 7 | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486SX-25 (50MHz)  |    3 & 4     | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486SX-33 (33MHz)  |    5 & 7     | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486SX-33 (66MHz)  |    1 & 2     | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486DX-33 (33MHz)  |    5 & 7     | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486DX-33 (66MHz)  |    1 & 2     | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486DX-40 (40MHz)  | 1 & 2, 3 & 4 | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486DX-50 (50MHz)  |    3 & 4     | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486DX2-50 (25MHz) |    3 & 4     | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486DX2-50 (50MHz) | 3 & 4, 5 & 7 | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486DX2-66 (33MHz) |    5 & 7     | 1 & 2 | 2 & 3 | 2 & 3 |
          |---------------------+--------------+-------+-------+-------|
          | 80486DX2-66 (66MHz) |    1 & 2     | 1 & 2 | 2 & 3 | 2 & 3 |
          |------------------------------------------------------------|
          | Note: Pins designated should be in the closed position.    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               CPU TYPE CONFIGURATION (CON’T)               |
          |------------------------------------------------------------|
          |        Type        | JP11  | JP14  | JP15  | JP16  | JP19  |
          |--------------------+-------+-------+-------+-------+-------|
          | 80386DX-40 (80MHz) | 1 & 2 | 1 & 2 | 1 & 2 | 2 & 3 | 2 & 3 |
          |--------------------+-------+-------+-------+-------+-------|
          |    CX486DLC-40     | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
          |      (80MHz)       |       |       |       |       |       |
          |--------------------+-------+-------+-------+-------+-------|
          | CX486M6-33 (33MHz) | 2 & 3 | 2 & 3 | Open  | 1 & 2 | 1 & 2 |
          |--------------------+-------+-------+-------+-------+-------|
          | CX486M6-33 (66MHz) | 1 & 2 | 2 & 3 | Open  | 1 & 2 | 2 & 3 |
          |--------------------+-------+-------+-------+-------+-------|
          | CX486M6-40 (40MHz) | 2 & 3 | 2 & 3 | Open  | 1 & 2 | 1 & 2 |
          |--------------------+-------+-------+-------+-------+-------|
          | CX486M6-33 (33MHz) | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
          |         C6         |       |       |       |       |       |
          |--------------------+-------+-------+-------+-------+-------|
          | CX486M6-33 (66MHz) | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
          |         C6         |       |       |       |       |       |
          |--------------------+-------+-------+-------+-------+-------|
          | CX486M6-40 (40MHz) | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
          |         C6         |       |       |       |       |       |
          |--------------------+-------+-------+-------+-------+-------|
          | 80486SX-25 (25MHz) | 2 & 3 | 2 & 3 | Open  | 1 & 2 | 1 & 2 |
          |--------------------+-------+-------+-------+-------+-------|
          | 80486SX-25 (50MHz) | 1 & 2 | 2 & 3 | Open  | 1 & 2 | 2 & 3 |
          |--------------------+-------+-------+-------+-------+-------|
          | 80486SX-33 (33MHz) | 2 & 3 | 2 & 3 | Open  | 1 & 2 | 1 & 2 |
          |--------------------+-------+-------+-------+-------+-------|
          | 80486SX-33 (66MHz) | 1 & 2 | 2 & 3 | Open  | 1 & 2 | 2 & 3 |
          |--------------------+-------+-------+-------+-------+-------|
          | 80486DX-33 (33MHz) | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
          |--------------------+-------+-------+-------+-------+-------|
          | 80486DX-33 (66MHz) | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
          |--------------------+-------+-------+-------+-------+-------|
          | 80486DX-40 (40MHz) | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
          |--------------------+-------+-------+-------+-------+-------|
          | 80486DX-50 (50MHz) | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
          |--------------------+-------+-------+-------+-------+-------|
          |    80486DX2-50     | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
          |      (25MHz)       |       |       |       |       |       |
          |--------------------+-------+-------+-------+-------+-------|
          |    80486DX2-50     | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
          |      (50MHz)       |       |       |       |       |       |
          |--------------------+-------+-------+-------+-------+-------|
          |    80486DX2-66     | 2 & 3 | 2 & 3 | 1 & 2 | 2 & 3 | 1 & 2 |
          |      (33MHz)       |       |       |       |       |       |
          |--------------------+-------+-------+-------+-------+-------|
          |    80486DX2-66     | 1 & 2 | 2 & 3 | 1 & 2 | 2 & 3 | 2 & 3 |
          |      (66MHz)       |       |       |       |       |       |
          |------------------------------------------------------------|
          | Note: Pins designated should be in the closed position.    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |               CPU TYPE CONFIGURATION (CON’T)               |
          |------------------------------------------------------------|
          |     Type      |  JP29  |  JP30  |  JP31  |  JP32  |  JP34  |
          |---------------+--------+--------+--------+--------+--------|
          |  80386DX-40   |  Open  |  Open  | Closed | Closed |  Open  |
          |    (80MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  CX486DLC-40  |  Open  |  Open  | Closed | Closed | Closed |
          |    (80MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  CX486M6-33   | Closed | Closed |  Open  |  Open  |  Open  |
          |    (33MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  CX486M6-33   | Closed | Closed |  Open  |  Open  |  Open  |
          |    (66MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  CX486M6-40   | Closed | Closed |  Open  |  Open  |  Open  |
          |    (40MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  CX486M6-33   |  Open  |  Open  | Closed | Closed |  Open  |
          |  (33MHz) C6   |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  CX486M6-33   |  Open  |  Open  | Closed | Closed |  Open  |
          |  (66MHz) C6   |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  CX486M6-40   |  Open  |  Open  | Closed | Closed |  Open  |
          |  (40MHz) C6   |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486SX-25   |  Open  |  Open  | Closed | Closed |  Open  |
          |    (25MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486SX-25   |  Open  |  Open  | Closed | Closed |  Open  |
          |    (50MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486SX-33   |  Open  |  Open  | Closed | Closed |  Open  |
          |    (33MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486SX-33   |  Open  |  Open  | Closed | Closed |  Open  |
          |    (66MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486DX-33   |  Open  |  Open  | Closed | Closed |  Open  |
          |    (33MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486DX-33   |  Open  |  Open  | Closed | Closed |  Open  |
          |    (66MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486DX-40   |  Open  |  Open  | Closed | Closed |  Open  |
          |    (40MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486DX-50   |  Open  |  Open  | Closed | Closed |  Open  |
          |    (50MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486DX2-50  |  Open  |  Open  | Closed | Closed |  Open  |
          |    (25MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486DX2-50  |  Open  |  Open  | Closed | Closed |  Open  |
          |    (50MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486DX2-66  |  Open  |  Open  | Closed | Closed |  Open  |
          |    (33MHz)    |        |        |        |        |        |
          |---------------+--------+--------+--------+--------+--------|
          |  80486DX2-66  |  Open  |  Open  | Closed | Closed |  Open  |
          |    (66MHz)    |        |        |        |        |        |
          +------------------------------------------------------------+