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

   MB-1420PA-CH/1433PA-CH

   KT TECHNOLOGY PTE LTD.

   KT433OP3C-WB/BI

   Processor             80486SX/80486DX                          
   Processor Speed       20/33MHz                                 
   Chip Set              OPTI                                     
   Max. Onboard DRAM     64MB                                     
   Cache                 64/256KB                                 
   BIOS                  AMI                                      
   Dimensions            327mm x 218mm                            
   I/O Options           None                                     
   NPU Options           4167                                     

<gopher://bitreich.org/I/th99/m/A-B/30548-1.png>
   

   +------------------------------------------------------------+
   |                        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     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1   |   Bank 2   |   Bank 3   |
   |-------+-------------+------------+------------+------------|
   |  1MB  | (4) 256K x  |    NONE    |    NONE    |    NONE    |
   |       |      9      |            |            |            |
   |-------+-------------+------------+------------+------------|
   |  1MB  |    NONE     |    NONE    | (1) 256K x |    NONE    |
   |       |             |            |     36     |            |
   |-------+-------------+------------+------------+------------|
   |  2MB  | (4) 256K x  | (4) 256K x |    NONE    |    NONE    |
   |       |      9      |     9      |            |            |
   |-------+-------------+------------+------------+------------|
   |  2MB  |    NONE     |    NONE    | (1) 256K x | (1) 256K x |
   |       |             |            |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   |  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 |  (1) 1M x  |    NONE    |
   |       |      9      |     36     |     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 |  (1) 1M x  |  (1) 1M x  |
   |       |      9      |     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    |
   |-------+-------------+------------+------------+------------|
   | 24MB  | (4) 1M x 9  | (4) 1M x 9 |  (1) 4M x  |    NONE    |
   |       |             |            |     36     |            |
   |-------+-------------+------------+------------+------------|
   | 28MB  | (4) 1M x 9  | (4) 1M x 9 |  (1) 4M x  | (1) 256K x |
   |       |             |            |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 32MB  | (4) 4M x 9  | (4) 4M x 9 |    NONE    |    NONE    |
   |-------+-------------+------------+------------+------------|
   | 36MB  | (4) 1M x 9  | (4) 4M x 9 |  (1) 4M x  |    NONE    |
   |       |             |            |     36     |            |
   |-------+-------------+------------+------------+------------|
   | 40MB  | (4) 1M x 9  | (4) 1M x 9 |  (1) 4M x  |  (1) 4M x  |
   |       |             |            |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 52MB  | (4) 1M x 9  | (4) 4M x 9 |  (1) 4M x  |  (1) 4M x  |
   |       |             |            |     36     |     36     |
   |-------+-------------+------------+------------+------------|
   | 64MB  | (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 revisions.                                           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1   |    TAG     | Dirty Bit  |
   |-------+-------------+------------+------------+------------|
   | 64KB  | (4) 8K x 8  | (4) 8K x 8 | (1) 8K x 8 | (1) 64K x  |
   |       |             |            |   at U34   |  1 at U46  |
   |-------+-------------+------------+------------+------------|
   | 256KB | (4) 32K x 8 | (4) 32K x  | (1) 32K x  | (1) 64K x  |
   |       |             |     8      |  8 at U34  |  1 at U46  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |   Size    |   JP8    |    JP9     |    JP10    |   JP12    |
   |-----------+----------+------------+------------+-----------|
   |   64KB    |   Open   |    Open    |    Open    |   Open    |
   |-----------+----------+------------+------------+-----------|
   |   256KB   |   Open   |   Closed   |   Closed   |  Closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Size   |        JP3        |   JP4   |        JP5        |
   |----------+-------------------+---------+-------------------|
   | 80486SX  |       Open        |  Open   | pins 2 & 3 closed |
   |----------+-------------------+---------+-------------------|
   | 80486DX  | pins 2 & 3 closed | Closed  | pins 1 & 2 closed |
   +------------------------------------------------------------+