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       # BIOSTAR MICROTECH INTERNATIONAL CORPORATION
       
          MB1420PD/1420PL/1425PD/1425PL/1433PD/
       
          1433PL/1450PD/1450PL/1450E
       
          Processor             80486SX/80486DX                          
          Processor Speed       20/25/33/50MHz                           
          Chip Set              OPTI                                     
          Max. Onboard DRAM     40MB                                     
          Cache                 64/128/256KB                             
          BIOS                  AMI                                      
          Dimensions            330mm x 218mm                            
          I/O Options           None                                     
          NPU Options           4167                                     
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose             | Location | Purpose        | Location |
          |---------------------+----------+----------------+----------|
          | External battery    |   J11    | Turbo LED      |   JP11   |
          |---------------------+----------+----------------+----------|
          | Power LED & keylock |   J20    | Reset switch   |   SW1    |
          |---------------------+----------+----------------+----------|
          | Speaker             |   J21    | Turbo switch   |   SW2    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function              | Jumper |   Position   |
          |------------------------------------+--------+--------------|
          | » | CMOS memory normal operation   |  JP1   |  pins 2 & 3  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          |   | CMOS memory clear              |  JP1   |  pins 1 & 2  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          | » | Monitor type select color      |  JP2   |    Closed    |
          |---+--------------------------------+--------+--------------|
          |   | Monitor type select monochrome |  JP2   |     Open     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                     DRAM CONFIGURATION                     |
          |------------------------------------------------------------|
          | Size  |   Bank 0    |    Bank 1    |   Bank 2   |  Bank 3  |
          |-------+-------------+--------------+------------+----------|
          |  1MB  | (4) 256K x  |     NONE     |    NONE    |   NONE   |
          |       |      9      |              |            |          |
          |-------+-------------+--------------+------------+----------|
          |  2MB  | (4) 256K x  | (4) 256K x 9 |    NONE    |   NONE   |
          |       |      9      |              |            |          |
          |-------+-------------+--------------+------------+----------|
          |  4MB  | (4) 1M x 9  |     NONE     |    NONE    |   NONE   |
          |-------+-------------+--------------+------------+----------|
          |  5MB  | (4) 256K x  |  (4) 1M x 9  |    NONE    |   NONE   |
          |       |      9      |              |            |          |
          |-------+-------------+--------------+------------+----------|
          |  6MB  | (4) 256K x  |  (1) 256K x  | (4) 1M x 9 |   NONE   |
          |       |      9      |      36      |            |          |
          |-------+-------------+--------------+------------+----------|
          |  8MB  | (4) 1M x 9  |  (4) 1M x 9  |    NONE    |   NONE   |
          |-------+-------------+--------------+------------+----------|
          |  9MB  | (4) 256K x  |  (4) 1M x 9  |  (1) 1M x  |   NONE   |
          |       |      9      |              |     36     |          |
          |-------+-------------+--------------+------------+----------|
          | 10MB  | (4) 256K x  | (4) 256K x 9 |  (1) 1M x  | (1) 1M x |
          |       |      9      |              |     36     |    36    |
          |-------+-------------+--------------+------------+----------|
          | 12MB  | (4) 1M x 9  |  (4) 1M x 9  |  (1) 1M x  |   NONE   |
          |       |             |              |     36     |          |
          |-------+-------------+--------------+------------+----------|
          | 13MB  | (4) 256K x  |  (4) 1M x 9  |  (1) 1M x  | (1) 1M x |
          |       |      9      |              |     36     |    36    |
          |-------+-------------+--------------+------------+----------|
          | 16MB  | (4) 1M x 9  |  (4) 1M x 9  |  (1) 1M x  | (1) 1M x |
          |       |             |              |     36     |    36    |
          |-------+-------------+--------------+------------+----------|
          | 16MB  | (4) 4M x 9  |     NONE     |    NONE    |   NONE   |
          |-------+-------------+--------------+------------+----------|
          | 20MB  | (4) 1M x 9  |  (4) 4M x 9  |    NONE    |   NONE   |
          |-------+-------------+--------------+------------+----------|
          | 20MB  | (4) 4M x 9  |  (4) 1M x 9  |    NONE    |   NONE   |
          |-------+-------------+--------------+------------+----------|
          | 24MB  | (4) 1M x 9  |  (4) 4M x 9  |  (1) 1M x  |   NONE   |
          |       |             |              |     36     |          |
          |-------+-------------+--------------+------------+----------|
          | 24MB  | (4) 1M x 9  |  (4) 4M x 9  | (1) 256K x |   NONE   |
          |       |             |              |     36     |          |
          |-------+-------------+--------------+------------+----------|
          | 24MB  | (4) 4M x 9  |  (4) 1M x 9  |  (1) 1M x  |   NONE   |
          |       |             |              |     36     |          |
          |-------+-------------+--------------+------------+----------|
          | 28MB  | (4) 4M x 9  |  (4) 1M x 9  |  (1) 1M x  | (1) 1M x |
          |       |             |              |     36     |    36    |
          |-------+-------------+--------------+------------+----------|
          | 32MB  | (4) 4M x 9  |  (4) 4M x 9  |    NONE    |   NONE   |
          |-------+-------------+--------------+------------+----------|
          | 36MB  | (4) 4M x 9  |  (4) 4M x 9  |  (1) 1M x  |   NONE   |
          |       |             |              |     36     |          |
          |-------+-------------+--------------+------------+----------|
          | 40MB  | (4) 4M x 9  |  (4) 4M x 9  |  (1) 1M x  | (1) 1M x |
          |       |             |              |     36     |    36    |
          |------------------------------------------------------------|
          | Note:36-bit SIMM banks 2 & 3 are not installed on some     |
          | board versions.                                            |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    CACHE CONFIGURATION                     |
          |------------------------------------------------------------|
          | Size  |   Bank 0    |   Bank 1   | TAG (U34)  | Dirty Bit  |
          |       |             |            |            |   (U46)    |
          |-------+-------------+------------+------------+------------|
          | 64KB  | (4) 8K x 8  | (4) 8K x 8 | (1) 8K x 8 | (1) 64K x  |
          |       |             |            |            |     1      |
          |-------+-------------+------------+------------+------------|
          | 128KB | (4) 32K x 8 |    NONE    | (1) 8K x 8 | (1) 64K x  |
          |       |             |            |            |     1      |
          |-------+-------------+------------+------------+------------|
          | 256KB | (4) 32K x 8 | (4) 32K x  | (1) 32K x  | (1) 64K x  |
          |       |             |     8      |     8      |     1      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          | Size  | JP8  |  JP9   |  JP10  |  JP12  |       JP13       |
          |-------+------+--------+--------+--------+------------------|
          | 64KB  | Open |  Open  |  Open  |  Open  |    pins 2 & 3    |
          |       |      |        |        |        |      closed      |
          |-------+------+--------+--------+--------+------------------|
          | 128KB | Open |  Open  | Closed | Closed |    pins 1 & 2    |
          |       |      |        |        |        |      closed      |
          |-------+------+--------+--------+--------+------------------|
          | 256KB | Open | Closed | Closed | Closed |    pins 2 & 3    |
          |       |      |        |        |        |      closed      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |   Type   |        JP3        |   JP4   |        JP5        |
          |----------+-------------------+---------+-------------------|
          | 80486SX  |       Open        |  Open   | pins 2 & 3 closed |
          |----------+-------------------+---------+-------------------|
          | 80486DX  | pins 2 & 3 closed | Closed  | pins 1 & 2 closed |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                  CPU SPEED CONFIGURATION                   |
          |------------------------------------------------------------|
          |           Speed            |              JP7              |
          |----------------------------+-------------------------------|
          |           20MHz            |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |           25MHz            |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |           33MHz            |       pins 2 & 3 closed       |
          |----------------------------+-------------------------------|
          |           50MHz            |       pins 1 & 2 closed       |
          +------------------------------------------------------------+