DATAEXPERT CORPORATION
======================

   OPTI-495SX

   Device Type    Mainboard                                       
   Processor      80386DX/80486SX/80487SX/80486DX/80486DX2/ODP486 
   Processor      25/33/40/50(internal)/50/66(internal)MHz        
   Speed          
   Chip Set       OPTI495SX                                       
   Maximum        32MB                                            
   Onboard Memory 
   Cache          64/128/256KB                                    
   BIOS           AMI                                             
   Dimensions     254mm x 218mm                                   
   I/O Options    32-bit VESA local bus slot                      
   NPU Options    80387DX                                         

<gopher://bitreich.org/I/th99/m/C-D/35929-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose       | Location | Purpose              | Location |
   |---------------+----------+----------------------+----------|
   | Power LED &   |    J1    | Reset switch         |    J5    |
   | keylock       |          |                      |          |
   |---------------+----------+----------------------+----------|
   | Speaker       |    J2    | External battery     |   JP18   |
   |---------------+----------+----------------------+----------|
   | Turbo switch  |    J3    | 32-bit VESA local    |   SL1    |
   |               |          | bus slot             |          |
   |---------------+----------+----------------------+----------|
   | Turbo LED     |    J4    |                      |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function               | Label |   Position   |
   |-------------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  JP8  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  JP9  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP10  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP11  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |   | Monitor type select color       | JP17  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |   | Monitor type select monochrome  | JP17  |     Open     |
   |---+---------------------------------+-------+--------------|
   |>> | CMOS memory normal operation    | JP18  |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | CMOS memory clear               | JP18  |  Pins 3 & 4  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | Battery type select external    | JP18  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP23  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP29  | Unidentified |
   |   | alter                           |       |              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     SIMM 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     |
   |------------------+--------------------+--------------------|
   |       5MB        |     (4) 1M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        None        |
   |------------------+--------------------+--------------------|
   |       17MB       |    (4) 256K x 9    |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       17MB       |     (4) 4M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       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  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |  Size   |   JP6    |   JP7   |  JP12   |       JP13        |
   |---------+----------+---------+---------+-------------------|
   |  64KB   |   Open   |  Open   |  Open   | Pins 2 & 3 closed |
   |---------+----------+---------+---------+-------------------|
   |  128KB  |   Open   | Closed  | Closed  | Pins 1 & 2 closed |
   |---------+----------+---------+---------+-------------------|
   |  256KB  |  Closed  | Closed  | Closed  | Pins 2 & 3 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CPU SPEED SELECTION                     |
   |------------------------------------------------------------|
   |    Speed    |       JP14        |  JP15  |  JP16  |  JP22  |
   |-------------+-------------------+--------+--------+--------|
   |    25MHz    | Pins 1 & 2 closed |  Open  | Closed |  N/A   |
   |-------------+-------------------+--------+--------+--------|
   | 33MHz (386) | Pins 2 & 3 closed | Closed |  Open  | Closed |
   |-------------+-------------------+--------+--------+--------|
   |    33MHz    | Pins 1 & 2 closed | Closed |  Open  |  N/A   |
   |-------------+-------------------+--------+--------+--------|
   | 40MHz (386) | Pins 2 & 3 closed |  Open  |  Open  |  Open  |
   |-------------+-------------------+--------+--------+--------|
   |   50iMHz    | Pins 1 & 2 closed |  Open  | Closed |  N/A   |
   |-------------+-------------------+--------+--------+--------|
   |    50MHz    | Pins 2 & 3 closed |  Open  | Closed |  N/A   |
   |-------------+-------------------+--------+--------+--------|
   |   66iMHz    | Pins 1 & 2 closed | Closed |  Open  |  N/A   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CPU TYPE SELECTION                     |
   |------------------------------------------------------------|
   |   Type    |  JP1   |        JP2        |        JP4        |
   |-----------+--------+-------------------+-------------------|
   |  80486SX  |  Open  | Pins 2 & 3 closed |       Open        |
   |-----------+--------+-------------------+-------------------|
   |  80487SX  | Closed | Pins 1 & 2 closed | Pins 2 & 3 closed |
   |-----------+--------+-------------------+-------------------|
   |  80486DX  | Closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
   |-----------+--------+-------------------+-------------------|
   | 80486DX2  | Closed | Pins 1 & 2 closed | Pins 1 & 2 closed |
   |-----------+--------+-------------------+-------------------|
   |  ODP486   | Closed | Pins 1 & 2 closed | Pins 2 & 3 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CPU TYPE SELECTION                     |
   |------------------------------------------------------------|
   |   Type    |     JP3     |    JP5     |  JP21  |    JP24    |
   |-----------+-------------+------------+--------+------------|
   |   80386   | Pins 2 & 3  | Pins 1 & 2 |  Open  | Pins 1 & 2 |
   |  (PQFP)   |   closed    |   closed   |        |   closed   |
   |-----------+-------------+------------+--------+------------|
   |   80486   | Pins 1 & 2  | Pins 2 & 3 | Closed | Pins 2 & 3 |
   |   (PGA)   |   closed    |   closed   |        |   closed   |
   |-----------+-------------+------------+--------+------------|
   |   80486   | Pins 1 & 2  | Pins 2 & 3 |  Open  | Pins 2 & 3 |
   | (PQFPGA)  |   closed    |   closed   |        |   closed   |
   +------------------------------------------------------------+