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

   BC3486UL

   Processor   80386DX/CX486DLC/80486SX/80487SX/ODP487SX/80486DX/ 
               80486DX2                                           
   Processor   20/25/33/40/50(internal)/50/66(internal)MHz        
   Speed       
   Chip Set    UMC                                                
   Video Chip  None                                               
   Set         
   Maximum     32MB                                               
   Onboard     
   Memory      
   Maximum     None                                               
   Video       
   Memory      
   Cache       64/128/256KB                                       
   BIOS        AMI                                                
   Dimensions  254mm x 218mm                                      
   I/O Options Local bus slot                                     
   NPU Options 80387DX/CX83D87                                    

<gopher://bitreich.org/I/th99/m/U-Z/34310-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | External battery |   BATT   | Turbo switch      |   CN4    |
   |------------------+----------+-------------------+----------|
   | Power LED &      |   CN1    | Turbo LED         |   CN5    |
   | keylock          |          |                   |          |
   |------------------+----------+-------------------+----------|
   | Speaker          |   CN2    | Auxiliary         |   KBD    |
   |                  |          | keyboard          |          |
   |                  |          | connector         |          |
   |------------------+----------+-------------------+----------|
   | Reset switch     |   CN3    | Local bus slot    |   SL1    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Label |   Position    |
   |------------------------------------+-------+---------------|
   |   | Battery type select internal   | BATT  |  Pins 2 & 3   |
   |   |                                |       |    closed     |
   |---+--------------------------------+-------+---------------|
   |   | Battery type select external   | BATT  |    Closed     |
   |---+--------------------------------+-------+---------------|
   |   | CMOS memory clear              | BATT  |  Pins 3 & 4   |
   |   |                                |       |    closed     |
   |---+--------------------------------+-------+---------------|
   |   | Monitor type select color      |  C/M  |    Closed     |
   |---+--------------------------------+-------+---------------|
   |   | Monitor type select monochrome |  C/M  |     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     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   |------------------------------------------------------------|
   | Note: The location of banks 0 & 1 is unidentified.         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    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  |  JS1   |  JS2   |  JS3   |  JS4   |  JS5  |  JS6  |
   |--------+--------+--------+--------+--------+-------+-------|
   |  64KB  | 1 & 2  | 1 & 2  | 1 & 2  | 1 & 2  | 1 & 2 | 2 & 3 |
   |--------+--------+--------+--------+--------+-------+-------|
   | 128KB  | 2 & 3  | 2 & 3  | 2 & 3  | 1 & 2  | 1 & 2 | 1 & 2 |
   |--------+--------+--------+--------+--------+-------+-------|
   | 256KB  | 2 & 3  | 2 & 3  | 1 & 2  | 2 & 3  | 2 & 3 | 2 & 3 |
   |------------------------------------------------------------|
   | Note: Pins designated should be in the closed position.    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                CPU SPEED SELECTION (80386)                 |
   |------------------------------------------------------------|
   |  Speed  |  JF1   |   JF2    |   JF3    |   JF4   |   JF5   |
   |---------+--------+----------+----------+---------+---------|
   |  25MHz  |  Open  |  Closed  |  Closed  | Closed  |  Open   |
   |---------+--------+----------+----------+---------+---------|
   |  33MHz  |  Open  |   Open   |  Closed  | Closed  | Closed  |
   |---------+--------+----------+----------+---------+---------|
   |  40MHz  |  Open  |  Closed  |   Open   | Closed  | Closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                CPU SPEED SELECTION (80486)                 |
   |------------------------------------------------------------|
   |  Speed   |   JF1    |   JF2    |   JF3   |  JF4  |   JF5   |
   |----------+----------+----------+---------+-------+---------|
   |  20MHz   |  Closed  |  Closed  |  Open   | Open  | Closed  |
   |----------+----------+----------+---------+-------+---------|
   |  25MHz   |   Open   |  Closed  | Closed  | Open  | Closed  |
   |----------+----------+----------+---------+-------+---------|
   |  33MHz   |   Open   |   Open   | Closed  | Open  | Closed  |
   |----------+----------+----------+---------+-------+---------|
   |  50iMHz  |   Open   |  Closed  | Closed  | Open  | Closed  |
   |----------+----------+----------+---------+-------+---------|
   |  50MHz   |   Open   |   Open   |  Open   | Open  |  Open   |
   |----------+----------+----------+---------+-------+---------|
   |  66iMHz  |   Open   |   Open   | Closed  | Open  |  Open   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CPU TYPE SELECTION                     |
   |------------------------------------------------------------|
   |   Type   |    JC1     |    JC2     |    JC3    |    JC4    |
   |----------+------------+------------+-----------+-----------|
   |  80386   | Pins 2 & 3 | Pins 2 & 3 | Pins 2 &  | Pins 2 &  |
   |          |   closed   |   closed   | 3 closed  | 3 closed  |
   |----------+------------+------------+-----------+-----------|
   | CX486DLC | Pins 2 & 3 | Pins 2 & 3 | Pins 2 &  | Pins 2 &  |
   |          |   closed   |   closed   | 3 closed  | 3 closed  |
   |----------+------------+------------+-----------+-----------|
   |  80486   | Pins 1 & 2 | Pins 1 & 2 | Pins 1 &  | Pins 1 &  |
   |          |   closed   |   closed   | 2 closed  | 2 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              CPU TYPE SELECTION (80486 ONLY)               |
   |------------------------------------------------------------|
   |    Type    |           JC5            |        J6C         |
   |------------+--------------------------+--------------------|
   |  80486SX   |    Pins 2 & 3 closed     |        Open        |
   |------------+--------------------------+--------------------|
   |  80487SX   | Pins 1 & 2, 3 & 4 closed | Pins 2 & 3 closed  |
   |------------+--------------------------+--------------------|
   |  ODP487SX  | Pins 1 & 2, 3 & 4 closed | Pins 2 & 3 closed  |
   |------------+--------------------------+--------------------|
   |  80486DX   | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed  |
   |------------+--------------------------+--------------------|
   |  80486DX2  | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       NPU SELECTION                        |
   |------------------------------------------------------------|
   |      Setting       |        JC7        |        JC8        |
   |--------------------+-------------------+-------------------|
   | NPU not installed  |       Open        |       Open        |
   |--------------------+-------------------+-------------------|
   |   NPU installed    |      Closed       |      Closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  LOCAL BUS SLOT SELECTION                  |
   |------------------------------------------------------------|
   |       Setting       |     J1     |     J2     |     J3     |
   |---------------------+------------+------------+------------|
   |  Normal ISA cards   | Pins 2 & 3 | Pins 2 & 3 | Pins 2 & 3 |
   |      installed      |   closed   |   closed   |   closed   |
   |---------------------+------------+------------+------------|
   |   Local Bus cards   | Pins 1 & 2 | Pins 1 & 2 | Pins 1 & 2 |
   |      installed      |   closed   |   closed   |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |             LOCAL BUS CARD INSTALLED SELECTION             |
   |------------------------------------------------------------|
   |  CPU installed   |         J4         |         J5         |
   |------------------+--------------------+--------------------|
   |      80386       | Pins 2 & 3 closed  | Pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |    80486DX-50    | Pins 2 & 3 closed  | Pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |  All CPU types   | Pins 1 & 2 closed  | Pins 1 & 2 closed  |
   +------------------------------------------------------------+