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                                     

<gopher://bitreich.org/I/th99/m/C-D/31134-1.png>
   

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