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

   486NL

 Processor  CX486S/80486SX/CX486DX/80486DX/CX486DX2/80486DX2/Pentium 
            Overdrive                                                
 Processor  20/25/33/40/50(internal)/50/66(internal)MHz              
 Speed      
 Chip Set   OPTI                                                     
 Max.       32MB                                                     
 Onboard    
 DRAM       
 Cache      64/128/256KB                                             
 BIOS       AMI                                                      
 Dimensions 254mm x 220mm                                            
 I/O        32-bit VESA local bus slots (2)                          
 Options    
 NPU        None                                                     
 Options    

<gopher://bitreich.org/I/th99/m/U-Z/32225-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | External battery  |    J6    | Speaker          |   J24    |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   J20    | Turbo switch     |   JJ23   |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Reset switch      |   J22    | 32-bit VESA      |  SL1 &   |
   |                   |          | local bus slots  |   SL2    |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |   J23    |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Jumper |   Position   |
   |------------------------------------+--------+--------------|
   |>> | CMOS memory normal operation   |   J1   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | CMOS memory clear              |   J1   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | Monitor type select color      |   J3   |    Closed    |
   |---+--------------------------------+--------+--------------|
   |   | Monitor type select monochrome |   J3   |     Open     |
   |---+--------------------------------+--------+--------------|
   |>> | Cyrix CPU type select CX486DX2 |  J19   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | Cyrix CPU type select CX486DX  |  J19   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | CPU type select Intel          |  J21   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | CPU type select Cyrix          |  J21   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | CPU type select PGA            |  J29   |    Closed    |
   |---+--------------------------------+--------+--------------|
   |   | CPU type select PQFP           |  J29   |     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 (U25)  | TAG (U26)  |
   |-------+-------------+------------+------------+------------|
   | 64KB  | (4) 8K x 8  | (4) 8K x 8 | (1) 8K x 8 |    NONE    |
   |-------+-------------+------------+------------+------------|
   | 128KB | (4) 32K x 8 |    NONE    | (1) 8K x 8 |    NONE    |
   |-------+-------------+------------+------------+------------|
   | 256KB | (4) 32K x 8 | (4) 32K x  | (1) 8K x 8 | (1) 8K x 8 |
   |       |             |     8      |            |            |
   |-------+-------------+------------+------------+------------|
   | 256KB | (4) 32K x 8 | (4) 32K x  | (1) 32K x  |    NONE    |
   |       |             |     8      |     8      |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |       J8        |   J9   |      J10       |  J14   |
   |-------+-----------------+--------+----------------+--------|
   | 64KB  |   pins 2 & 3    |  Open  |   pins 1 & 2   |  Open  |
   |       |     closed      |        |     closed     |        |
   |-------+-----------------+--------+----------------+--------|
   | 128KB |   pins 1 & 2    | Closed |   pins 2 & 3   |  Open  |
   |       |     closed      |        |     closed     |        |
   |-------+-----------------+--------+----------------+--------|
   | 256KB |   pins 2 & 3    | Closed |   pins 1 & 2   | Closed |
   |       |     closed      |        |     closed     |        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type   |        J11        |   J12   |        J13        |
   |----------+-------------------+---------+-------------------|
   | 80486SX  | pins 1 & 2 closed |  Open   | pins 2 & 3 closed |
   |----------+-------------------+---------+-------------------|
   | 80486DX  | pins 2 & 3 closed | Closed  | pins 1 & 2 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   | Speed  |  J15   |  J16   |      J17       |      J18       |
   |--------+--------+--------+----------------+----------------|
   | 25MHz  | Closed |  Open  |   pins 1 & 2   |   pins 2 & 3   |
   |        |        |        |     closed     |     closed     |
   |--------+--------+--------+----------------+----------------|
   | 33MHz  |  Open  | Closed |   pins 1 & 2   |   pins 2 & 3   |
   |        |        |        |     closed     |     closed     |
   |--------+--------+--------+----------------+----------------|
   | 40MHz  | Closed | Closed |   pins 2 & 3   |   pins 2 & 3   |
   |        |        |        |     closed     |     closed     |
   |--------+--------+--------+----------------+----------------|
   | 50iMHz | Closed |  Open  |   pins 1 & 2   |   pins 2 & 3   |
   |        |        |        |     closed     |     closed     |
   |--------+--------+--------+----------------+----------------|
   | 50MHz  | Closed |  Open  |   pins 2 & 3   |   pins 1 & 2   |
   |        |        |        |     closed     |     closed     |
   |--------+--------+--------+----------------+----------------|
   | 66iMHz |  Open  | Closed |   pins 1 & 2   |   pins 2 & 3   |
   |        |        |        |     closed     |     closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               VESA WAIT STATE CONFIGURATION                |
   |------------------------------------------------------------|
   |          Wait states          |            J28             |
   |-------------------------------+----------------------------|
   |         0 wait states         |            Open            |
   |-------------------------------+----------------------------|
   |         1 wait state          |           Closed           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BUS SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |           CPU speed           |            J25             |
   |-------------------------------+----------------------------|
   |           <= 33MHz            |            Open            |
   |-------------------------------+----------------------------|
   |            > 33MHz            |           Closed           |
   +------------------------------------------------------------+