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

   80486

   Processor         80486SX/80487SX/ODP486SX/80486DX/80486DX2    
   Processor Speed   20/25/33/40/50(internal)/66(internal)MHz     
   Chip Set          OPTI                                         
   Max. Onboard DRAM 32MB                                         
   Cache             None                                         
   BIOS              AMI                                          
   Dimensions        254mm x 218mm                                
   I/O Options       None                                         
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/U-Z/32205-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   J17    | External battery |   J20    |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Speaker           |   J18    | Turbo switch     |   J21    |
   |-------------------+----------+------------------+----------|
   | Reset switch      |   J19    | Turbo LED        |   J22    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | CPU type select PGA or PQFP      |  J23   |    Open    |
   |   | installed                        |        |            |
   |---+----------------------------------+--------+------------|
   |   | CPU type select PQFP disabled &  |  J23   |   Closed   |
   |   | PGA enabled                      |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Monitor type select monochrome   |  JP3   |    Open    |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select              |  JP3   |   Closed   |
   |   | color/EGA/VGA                    |        |            |
   |---+----------------------------------+--------+------------|
   |>> | CMOS memory normal operation     |  JP5   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | CMOS memory clear                |  JP5   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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        |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |    Type     | JP101  |   JP102    |   JP103    |   JP104   |
   |-------------+--------+------------+------------+-----------|
   |   80486SX   |  Open  | pins 2 & 3 |    Open    | pins 2 &  |
   |             |        |   closed   |            | 3 closed  |
   |-------------+--------+------------+------------+-----------|
   |   80487SX   | Closed | pins 1 & 2 | pins 2 & 3 | pins 2 &  |
   |             |        |   closed   |   closed   | 3 closed  |
   |-------------+--------+------------+------------+-----------|
   |  ODP486SX   | Closed | pins 1 & 2 | pins 2 & 3 | pins 2 &  |
   |             |        |   closed   |   closed   | 3 closed  |
   |-------------+--------+------------+------------+-----------|
   | 80486DX/DX2 | Closed | pins 1 & 2 | pins 1 & 2 | pins 2 &  |
   |             |        |   closed   |   closed   | 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |     Speed     |     J24      |     J25      |     J26      |
   |---------------+--------------+--------------+--------------|
   |     20MHz     |     Open     |    Closed    |    Closed    |
   |---------------+--------------+--------------+--------------|
   |     25MHz     |    Closed    |     Open     |    Closed    |
   |---------------+--------------+--------------+--------------|
   |     33MHz     |    Closed    |    Closed    |     Open     |
   |---------------+--------------+--------------+--------------|
   |    50iMHz     |    Closed    |     Open     |    Closed    |
   |---------------+--------------+--------------+--------------|
   |    66iMHz     |    Closed    |    Closed    |     Open     |
   +------------------------------------------------------------+