BIOSTAR MICROTECH INTERNATIONAL CORPORATION
===========================================

   MB-1420C-CH/1433C-CH

   Processor             80486SX/80486DX                          
   Processor Speed       20/33MHz                                 
   Chip Set              C & T                                    
   Max. Onboard DRAM     32MB                                     
   Cache                 64/128KB                                 
   BIOS                  AMI                                      
   Dimensions            327mm x 218mm                            
   I/O Options           None                                     
   NPU Options           4167                                     

<gopher://bitreich.org/I/th99/m/A-B/30658-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Speaker           |    J1    | Turbo LED        |    J4    |
   |-------------------+----------+------------------+----------|
   | Power LED &       |    J2    | Turbo switch     |    J5    |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Reset switch      |    J3    | External battery |    J6    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Jumper |   Position   |
   |------------------------------------+--------+--------------|
   |>> | CMOS memory normal operation   |   W4   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | CMOS memory clear              |   W4   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | Monitor type select color      |   W5   |    Closed    |
   |---+--------------------------------+--------+--------------|
   |   | Monitor type select monochrome |   W5   |     Open     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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     |
   |------------------+--------------------+--------------------|
   |       5MB        |     (4) 1M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       17MB       |     (4) 4M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       17MB       |    (4) 256K x 9    |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 4M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |  Size   |    Bank 0     |  Bank 1  | TAG (U21) | TAG (U22) |
   |---------+---------------+----------+-----------+-----------|
   |  64KB   |  (4) 8K x 8   | (4) 8K x | (1) 8K x  | (1) 8K x  |
   |         |               |    8     |     8     |     8     |
   |---------+---------------+----------+-----------+-----------|
   |  128KB  |  (4) 32K x 8  |   NONE   | (1) 32K x |   NONE    |
   |         |               |          |     8     |           |
   |------------------------------------------------------------|
   | Note:Bank 0 = U8, U10, U12, & U14. With 16MB or more of    |
   | DRAM, 128KB of cache must be installed.                    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |            Size            |              W1               |
   |----------------------------+-------------------------------|
   |            64KB            |       pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |           128KB            |       pins 1 & 2 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |        Type        |        W2         |        W3         |
   |--------------------+-------------------+-------------------|
   |     80486SX-20     |       Open        |      Closed       |
   |--------------------+-------------------+-------------------|
   |     80487SX-20     |      Closed       |       Open        |
   |--------------------+-------------------+-------------------|
   |     80486DX-33     |       Open        |       Open        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  POWER GOOD CONFIGURATION                  |
   |------------------------------------------------------------|
   |        Type        |        W6         |        W7         |
   |--------------------+-------------------+-------------------|
   | Signal detect from | pins 1 & 2 closed | pins 1 & 2 closed |
   |    power supply    |                   |                   |
   |--------------------+-------------------+-------------------|
   | Signal detect from | pins 2 & 3 closed | pins 2 & 3 closed |
   |       board        |                   |                   |
   +------------------------------------------------------------+