UNIDENTIFIED
============

   OPTI486DX-33/50WB, 486SX-20/25WB

   Processor         80486SX/80486DX                              
   Processor Speed   20/25/33/50(internal)MHz                     
   Chip Set          OPTI                                         
   Max. Onboard DRAM 40MB (8MB on external memory card)           
   Cache             64/256KB                                     
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       32-bit external memory card                  
   NPU Options       4167                                         

<gopher://bitreich.org/I/th99/m/U-Z/32197-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | External battery  |   J10    | 32-bit external  |   SL1    |
   |                   |          | memory card      |          |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |   J12    | Reset switch     |   SW1    |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   J23    | Turbo switch     |   SW2    |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Speaker           |   J24    |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Jumper |   Position   |
   |------------------------------------+--------+--------------|
   |>> | Monitor type select monochrome |  JP1   |     Open     |
   |---+--------------------------------+--------+--------------|
   |   | Monitor type select color      |  JP1   |    Closed    |
   |---+--------------------------------+--------+--------------|
   |>> | CMOS memory normal operation   |  JP2   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | CMOS memory clear              |  JP2   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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  |    NONE    |    NONE    |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 3MB  | (4) 256K x  | (4) 256K x  | (4) 256K x |    NONE    |
   |      |      9      |      9      |     9      |            |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (4) 256K x  | (4) 256K x  | (4) 256K x | (4) 256K x |
   |      |      9      |      9      |     9      |     9      |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (4) 1M x 9  |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 5MB  | (4) 256K x  | (4) 1M x 9  |    NONE    |    NONE    |
   |      |      9      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 6MB  | (4) 256K x  | (4) 256K x  | (4) 1M x 9 |    NONE    |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 7MB  | (4) 256K x  | (4) 256K x  | (4) 256K x | (4) 1M x 9 |
   |      |      9      |      9      |     9      |            |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (4) 1M x 9  | (4) 1M x 9  |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 12MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 16MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 | (4) 1M x 9 |
   |------+-------------+-------------+------------+------------|
   | 16MB | (4) 4M x 9  |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 32MB | (4) 4M x 9  | (4) 4M x 9  |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 36MB | (4) 4M x 9  | (4) 4M x 9  | (4) 1M x 9 |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 40MB | (4) 4M x 9  | (4) 4M x 9  | (4) 1M x 9 | (4) 1M x 9 |
   |------------------------------------------------------------|
   | Note: Banks 2 & 3 are located on the external memory card. |
   +------------------------------------------------------------+

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

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |   Size    |    JP8     |    JP9    |   JP10    |   JP11    |
   |-----------+------------+-----------+-----------+-----------|
   |   64KB    |    Open    |   Open    |   Open    |   Open    |
   |-----------+------------+-----------+-----------+-----------|
   |   256KB   |   Closed   |  Closed   |  Closed   |  Closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type   |        JP5        |        JP6        |   JP7   |
   |----------+-------------------+-------------------+---------|
   | 80486SX  | pins 1 & 2 closed | pins 2 & 3 closed |  Open   |
   |----------+-------------------+-------------------+---------|
   | 80486DX  | pins 2 & 3 closed | pins 1 & 2 closed | Closed  |
   +------------------------------------------------------------+