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       # DATAEXPERT CORPORATION
       
          OPTI-495WB Ver 2.0
       
          Processor             80486SX/80486DX/ODP486SX                 
          Processor Speed       20/25/33/50MHz                           
          Chip Set              OPTI                                     
          Max. Onboard DRAM     32MB                                     
          Cache                 64/128/256/512KB                         
          BIOS                  AMI                                      
          Dimensions            330mm x 218mm                            
          I/O Options           None                                     
          NPU Options           4167                                     
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose           | Location | Purpose          | Location |
          |-------------------+----------+------------------+----------|
          | Power LED &       |    J1    | Turbo switch     |    J4    |
          | keylock           |          |                  |          |
          |-------------------+----------+------------------+----------|
          | Speaker           |    J2    | Turbo LED        |    J5    |
          |-------------------+----------+------------------+----------|
          | Reset switch      |    J3    | External battery |    J6    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |              Function              | Jumper |   Position   |
          |------------------------------------+--------+--------------|
          | » | CMOS memory normal operation   |   J6   |  pins 2 & 3  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          |   | CMOS memory clear              |   J6   |  pins 3 & 4  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          | » | CPU speed select 20/25/33MHz   |  JP9   |  pins 2 & 3  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          |   | CPU speed select 50MHz         |  JP9   |  pins 1 & 2  |
          |   |                                |        |    closed    |
          |---+--------------------------------+--------+--------------|
          | » | Monitor type select color      |  JP10  |    Closed    |
          |---+--------------------------------+--------+--------------|
          |   | Monitor type select monochrome |  JP10  |     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      |
          |----------------+---------------------+---------------------|
          |      8MB       |     (4) 1M x 9      |     (4) 1M x 9      |
          |----------------+---------------------+---------------------|
          |      16MB      |     (4) 4M x 9      |        NONE         |
          |----------------+---------------------+---------------------|
          |      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      |
          |------------+---------------+---------------+---------------|
          |    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  |
          |------------+---------------+---------------+---------------|
          |   512KB    | (4) 128K x 8  |     NONE      |  (1) 32K x 8  |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 CACHE JUMPER CONFIGURATION                 |
          |------------------------------------------------------------|
          |Size |JP4 | JP5  | JP6  | JP7  | JP13 |JP15 |JP16 |JP17|JP18|
          |-----+----+------+------+------+------+-----+-----+----+----|
          |64KB |2 & | Open | Open | Open | Open |1 & 2|1 & 2|2 & |2 & |
          |     | 3  |      |      |      |      |     |     | 3  | 3  |
          |-----+----+------+------+------+------+-----+-----+----+----|
          |128KB|1 & | Open | Open |Closed|Closed|2 & 3|1 & 2|1 & |2 & |
          |     | 2  |      |      |      |      |     |     | 2  | 3  |
          |-----+----+------+------+------+------+-----+-----+----+----|
          |256KB|2 & |Closed| Open |Closed|Closed|1 & 2|2 & 3|1 & |2 & |
          |     | 3  |      |      |      |      |     |     | 2  | 3  |
          |-----+----+------+------+------+------+-----+-----+----+----|
          |512KB|1 & |Closed|Closed|Closed|Closed|2 & 3|2 & 3|1 & |2 & |
          |     | 2  |      |      |      |      |     |     | 2  | 3  |
          |------------------------------------------------------------|
          |Note:Pins designated should be in the closed position.      |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                   CPU TYPE CONFIGURATION                   |
          |------------------------------------------------------------|
          |   Type    |  JP1   |        JP2        |        JP3        |
          |-----------+--------+-------------------+-------------------|
          |  80486SX  |  Open  | pins 2 & 3 closed |       Open        |
          |-----------+--------+-------------------+-------------------|
          | ODP486SX  | Closed | pins 1 & 2 closed | pins 1 & 2 closed |
          |-----------+--------+-------------------+-------------------|
          |  80486DX  | Closed | pins 1 & 2 closed | pins 2 & 3 closed |
          +------------------------------------------------------------+