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

   MB 1433/1450AEA-P

   Processor    80486SX/80487SX/80486DX/80486DX2/Pentium          
                Overdrive                                         
   Processor    20/25/33/50(internal)/50/66(internal)MHz          
   Speed        
   Chip Set     VLSI                                              
   Max. Onboard 32MB                                              
   DRAM         
   Cache        64/128/256KB                                      
   BIOS         AMI                                               
   Dimensions   230mm x 218mm                                     
   I/O Options  None                                              
   NPU Options  None                                              

<gopher://bitreich.org/I/th99/m/A-B/32050-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Speaker           |    J1    | Turbo switch     |    J5    |
   |-------------------+----------+------------------+----------|
   | Power LED &       |    J2    | 5v DC ground     |    J6    |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |    J3    | External battery |   JP8    |
   |-------------------+----------+------------------+----------|
   | Reset switch      |    J4    |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP4   | pins 2 & 3 |
   |   | alter                            |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Tag RAM size select 7- bit       |  JP6   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Tag RAM size select 8- bit       |  JP6   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Battery type select RTC 146818   |  JP11  |    Open    |
   |---+----------------------------------+--------+------------|
   |   | Battery type select Dallas 1287  |  JP11  |   Closed   |
   |---+----------------------------------+--------+------------|
   |>> | Monitor type select monochrome   |  JP14  | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select color        |  JP14  | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | CMOS memory normal operation     |  JP16  | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | CMOS memory clear                |  JP16  | pins 1 & 2 |
   |   |                                  |        |   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) 4M x 9     |     (4) 1M 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  |              JP12              |       JP19        |
   |-------+--------------------------------+-------------------|
   | 64KB  |              Open              | pins 1 & 2 closed |
   |-------+--------------------------------+-------------------|
   | 128KB |    pins 1 & 2, 3 & 4 closed    | pins 2 & 3 closed |
   |-------+--------------------------------+-------------------|
   | 256KB |    pins 1 & 2, 3 & 4, 5 & 6    | pins 1 & 2 closed |
   |       |             closed             |                   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |       Type       |        JP13        |        JP20        |
   |------------------+--------------------+--------------------|
   |     80486SX      |        Open        | pins 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |     80487SX      | pins 1 & 2 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |   80486DX/DX2    | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |    Overdrive     | pins 1 & 2 closed  | pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |        Speed         |        JP5         |      JP10      |
   |----------------------+--------------------+----------------|
   |      80486DX-50      | pins 1 & 2 closed  |     Closed     |
   |----------------------+--------------------+----------------|
   | All other CPU speeds | pins 2 & 3 closed  |      Open      |
   +------------------------------------------------------------+