MECER CORPORATION
=================

   B830 (REV. B)

   Processor         80486SX/80487SX/80486DX/80486DX2             
   Processor Speed   20/25/33/40/50(internal)/50/66(internal)MHz  
   Chip Set          Unidentified                                 
   Max. Onboard DRAM 32MB                                         
   Cache             64/128/256KB                                 
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       32-bit VESA local bus slots (2)              
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/M-O/32499-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | External battery |   JP2    | Turbo switch      |   JP15   |
   |------------------+----------+-------------------+----------|
   | Reset switch     |   JP3    | Turbo LED         |   JP16   |
   |------------------+----------+-------------------+----------|
   | Power LED &      |   JP9    | Auxiliary         |  JP104   |
   | keylock          |          | keyboard          |          |
   |                  |          | connector         |          |
   |------------------+----------+-------------------+----------|
   | Speaker          |   JP10   | 32-bit VESA local |  SL1 &   |
   |                  |          | bus slots         |   SL2    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Jumper  | Position |
   |---------------------------------------+---------+----------|
   |>> | Factory configured - do not alter |   JP5   |   N/A    |
   |---+-----------------------------------+---------+----------|
   |>> | CMOS memory normal operation      |   JP6   |   Open   |
   |---+-----------------------------------+---------+----------|
   |   | CMOS memory clear                 |   JP6   |  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  |    JP8A     |    JP8B    |    JP8D    |    JP8E    |
   |-------+-------------+------------+------------+------------|
   | 64KB  | pins 2 & 3  | pins 2 & 3 | pins 2 & 3 | pins 2 & 3 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 128KB | pins 1 & 2  | pins 1 & 2 | pins 1 & 2 | pins 1 & 2 |
   |       |   closed    |   closed   |   closed   |   closed   |
   |-------+-------------+------------+------------+------------|
   | 256KB | pins 2 & 3  | pins 1 & 2 | pins 2 & 3 | pins 1 & 2 |
   |       |   closed    |   closed   |   closed   |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type    |    JP12    |   JP13    |   JP29    |   JP30    |
   |-----------+------------+-----------+-----------+-----------|
   |  80486SX  | pins 2 & 3 | pins 2 &  | pins 2 &  | pins 2 &  |
   |  (PQFP)   |   closed   | 3 closed  | 3 closed  | 3 closed  |
   |-----------+------------+-----------+-----------+-----------|
   |  80486SX  | pins 2 & 3 | pins 2 &  | pins 1 &  | pins 2 &  |
   |   (PGA)   |   closed   | 3 closed  | 2 closed  | 3 closed  |
   |-----------+------------+-----------+-----------+-----------|
   |  80487SX  | pins 1 & 2 | pins 1 &  | pins 1 &  | pins 2 &  |
   |           |   closed   | 2 closed  | 2 closed  | 3 closed  |
   |-----------+------------+-----------+-----------+-----------|
   |  80486DX  | pins 2 & 3 | pins 2 &  | pins 2 &  | pins 2 &  |
   |  (PQFP)   |   closed   | 3 closed  | 3 closed  | 3 closed  |
   |-----------+------------+-----------+-----------+-----------|
   |  80486DX  | pins 1 & 2 | pins 1 &  | pins 1 &  | pins 1 &  |
   |   (PGA)   |   closed   | 2 closed  | 2 closed  | 2 closed  |
   |-----------+------------+-----------+-----------+-----------|
   | 80486DX2  | pins 1 & 2 | pins 1 &  | pins 1 &  | pins 1 &  |
   |           |   closed   | 2 closed  | 2 closed  | 2 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   | Speed  |      JP7A       |      JP8B      |      JP7C      |
   |--------+-----------------+----------------+----------------|
   | 20MHz  |   pins 2 & 3    |   pins 1 & 2   |   pins 1 & 2   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   | 25MHz  |   pins 1 & 2    |   pins 2 & 3   |   pins 1 & 2   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   | 33MHz  |   pins 1 & 2    |   pins 1 & 2   |   pins 2 & 3   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   | 40MHz  |   pins 2 & 3    |   pins 2 & 3   |   pins 1 & 2   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   | 50iMHz |   pins 1 & 2    |   pins 2 & 3   |   pins 1 & 2   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   | 50MHz  |   pins 2 & 3    |   pins 1 & 2   |   pins 2 & 3   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   | 66iMHz |   pins 1 & 2    |   pins 1 & 2   |   pins 2 & 3   |
   |        |     closed      |     closed     |     closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               VESA WAIT STATE CONFIGURATION                |
   |------------------------------------------------------------|
   |        Wait states         |             JP102             |
   |----------------------------+-------------------------------|
   |       0 wait states        |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |        1 wait state        |       pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BUS SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |         CPU speed          |             JP103             |
   |----------------------------+-------------------------------|
   |          <= 33MHz          |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |          > 33MHz           |       pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                VESA BUS DELAY CONFIGURATION                |
   |------------------------------------------------------------|
   |  Delay   | JP105  | JP106 |     JP107     | JP108 | JP109  |
   |----------+--------+-------+---------------+-------+--------|
   |  Normal  |  Open  | Open  | 1 & 2 , 4 & 5 | Open  |  Open  |
   |----------+--------+-------+---------------+-------+--------|
   | 1 delay  | 1 & 2  | Open  | 2 & 3, 4 & 5  | 1 & 2 |  Open  |
   |----------+--------+-------+---------------+-------+--------|
   | 2 delays | 2 & 3  | 1 & 2 | 1 & 2, 3 & 4  | 2 & 3 | Closed |
   |----------+--------+-------+---------------+-------+--------|
   | 3 delays | 2 & 3  | 2 & 3 | 1 & 2, 3 & 4  | 2 & 3 | Closed |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  VESA CARD CONFIGURATION                   |
   |------------------------------------------------------------|
   |         Speed         |      JP110       |      JP111      |
   |-----------------------+------------------+-----------------|
   | Normal card installed |      Closed      |     Closed      |
   |-----------------------+------------------+-----------------|
   | Weitek card installed |       Open       |      Open       |
   +------------------------------------------------------------+