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

   OPTI-495SX-2VL

Device     Mainboard                                                    
Type       
Processor  80386DX/CX486DLC/CX486DLC/80486SX/80486DX                    
Processor  8/10/12/16/20/25/33/40/50(internal)/50/60/66(internal)/66/75 
Speed                                                                   
           (internal)/80(internal)/100(internal)/120(internal)/75/90MHz 
Chip Set   OPTI                                                         
Maximum    32MB                                                         
Onboard    
Memory     
Cache      64/128/256KB                                                 
BIOS       AMI                                                          
Dimensions 254mm x 218mm                                                
I/O        32-bit VESA local bus slots (2)                              
Options    
NPU        80387, CX87DLC                                               
options    

<gopher://bitreich.org/I/th99/m/C-D/35868-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose       | Location | Purpose              | Location |
   |---------------+----------+----------------------+----------|
   | Power LED &   |    J1    | Reset switch         |    J5    |
   | keylock       |          |                      |          |
   |---------------+----------+----------------------+----------|
   | Speaker       |    J2    | External battery     |   JP35   |
   |---------------+----------+----------------------+----------|
   | Turbo switch  |    J3    | 32-bit VESA local    |  SL1 -   |
   |               |          | bus slots            |   SL2    |
   |---------------+----------+----------------------+----------|
   | Turbo LED     |    J4    |                      |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function               | Label |   Position   |
   |-------------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  JP2  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  JP2  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  JP4  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  JP5  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  JP6  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP17  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP18  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP19  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP20  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP21  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP22  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP23  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  JP4  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     | JP31  | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |   | Monitor type select color       | JP34  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |   | Monitor type select monochrome  | JP34  |     Open     |
   |---+---------------------------------+-------+--------------|
   |>> | CMOS memory normal operation    | JP35  |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | CMOS memory clear               | JP35  |  Pins 3 & 4  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | Battery type select external    | JP35  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |   | 80387 PGA installed             | JP36  |    Closed    |
   |---+---------------------------------+-------+--------------|
   |   | 80387 PQFP installed            | JP36  |     Open     |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  S1   | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  S2   | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  S3   | 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) 32K x 8  |
   |------------+---------------+---------------+---------------|
   |   128KB    |  (4) 32K x 8  |     None      |  (1) 32K x 8  |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 8  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |  Size   |       JP25        |   JP26   |  JP27   |  JP28   |
   |---------+-------------------+----------+---------+---------|
   |  64KB   | Pins 2 & 3 closed |   Open   |  Open   |  Open   |
   |---------+-------------------+----------+---------+---------|
   |  128KB  | Pins 1 & 2 closed |   Open   | Closed  | Closed  |
   |---------+-------------------+----------+---------+---------|
   |  256KB  | Pins 2 & 3 closed |  Closed  | Closed  | Closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CPU TYPE SELECTION                     |
   |------------------------------------------------------------|
   |             Type              |            JP7             |
   |-------------------------------+----------------------------|
   |        80386DX (PQFP)         |            Open            |
   |-------------------------------+----------------------------|
   |         80386DX (PGA)         |           Closed           |
   |-------------------------------+----------------------------|
   |        CX486DLC (PGA)         |           Closed           |
   |-------------------------------+----------------------------|
   |           CX 486DLC           |           Closed           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CPU TYPE SELECTION                     |
   |------------------------------------------------------------|
   |    Type     |  JP1   |  JP10  | JP11  | JP12 | JP16 | JP33 |
   |-------------+--------+--------+-------+------+------+------|
   | 80386DX-25  |  Open  | Closed | 1 & 2 | 2 &  | 2 &  | 1 &  |
   |             |        |        |       |  3   |  3   |  2   |
   |-------------+--------+--------+-------+------+------+------|
   | 80386DX-33  | Closed |  Open  | 1 & 2 | 2 &  | 2 &  | 1 &  |
   |             |        |        |       |  3   |  3   |  2   |
   |-------------+--------+--------+-------+------+------+------|
   | 80386DX-40  |  Open  |  Open  | 1 & 2 | 2 &  | 2 &  | 1 &  |
   |             |        |        |       |  3   |  3   |  2   |
   |-------------+--------+--------+-------+------+------+------|
   | CX486DLC-33 | Closed |  Open  | 1 & 2 | 2 &  | 2 &  | 1 &  |
   |             |        |        |       |  3   |  3   |  2   |
   |-------------+--------+--------+-------+------+------+------|
   | CX486DLC-40 |  Open  |  Open  | 1 & 2 | 2 &  | 2 &  | 1 &  |
   |             |        |        |       |  3   |  3   |  2   |
   |-------------+--------+--------+-------+------+------+------|
   | 80486SX-25  |  Open  | Closed | 2 & 3 | 1 &  | 1 &  | 2 &  |
   |             |        |        |       |  2   |  2   |  3   |
   |-------------+--------+--------+-------+------+------+------|
   | 80486DX-33  | Closed |  Open  | 2 & 3 | 1 &  | 1 &  | 2 &  |
   |             |        |        |       |  2   |  2   |  3   |
   |-------------+--------+--------+-------+------+------+------|
   | 80486DX-50  |  Open  | Closed | 1 & 2 | 1 &  | 1 &  | 2 &  |
   |             |        |        |       |  2   |  2   |  3   |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              CPU SPEED SELECTION (80486 ONLY)              |
   |------------------------------------------------------------|
   |   Type   |        JP8        |       JP29        |  JP30   |
   |----------+-------------------+-------------------+---------|
   | 80486SX  |       Open        | Pins 2 & 3 closed |  Open   |
   |----------+-------------------+-------------------+---------|
   | 80487SX  | Pins 2 & 3 closed | Pins 1 & 2 closed | Closed  |
   |----------+-------------------+-------------------+---------|
   | 80486DX  | Pins 1 & 2 closed | Pins 1 & 2 closed | Closed  |
   +------------------------------------------------------------+