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

   U486 (ML-U486DX50/33HS/V1)

   Processor              80486SX/80487SX/80486DX                 
   Processor Speed        33/50MHz                                
   Chip Set               UMC                                     
   Video Chip Set         None                                    
   Maximum Onboard Memory 32MB                                    
   Maximum Video Memory   None                                    
   Cache                  64/128/256KB                            
   BIOS                   AMI                                     
   Dimensions             254mm x 218mm                           
   I/O Options            None                                    
   NPU Options            None                                    

<gopher://bitreich.org/I/th99/m/U-Z/33719-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose             | Location | Purpose        | Location |
   |---------------------+----------+----------------+----------|
   | External battery    |    J3    | Turbo LED      |   J11    |
   |---------------------+----------+----------------+----------|
   | Speaker             |    J8    | Reset switch   |   J12    |
   |---------------------+----------+----------------+----------|
   | Power LED & keylock |    J9    | Turbo switch   |   JP1    |
   |---------------------+----------+----------------+----------|
   | Turbo switch        |   J10    |                |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function               | Label |   Position   |
   |-------------------------------------+-------+--------------|
   |>> | Battery type select internal    |  J1   |    Closed    |
   |---+---------------------------------+-------+--------------|
   |   | Battery type select external    |  J1   |     Open     |
   |---+---------------------------------+-------+--------------|
   |>> | NPU synchronous with CPU        |  J5   |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | NPU asynchronous with CPU       |  J5   |  Pins 1 & 2  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Monitor type select color       |  J6   |    Closed    |
   |---+---------------------------------+-------+--------------|
   |   | Monitor type select monochrome  |  J6   |     Open     |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  J7   | Unidentified |
   |   | alter                           |       |              |
   |---+---------------------------------+-------+--------------|
   |>> | CMOS memory normal operation    |  J13  |  Pins 1 & 2  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |   | CMOS memory clear               |  J13  |  Pins 2 & 3  |
   |   |                                 |       |    closed    |
   |---+---------------------------------+-------+--------------|
   |>> | Factory configured - do not     |  W4   | Unidentified |
   |   | alter                           |       |              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              CACHE CONFIGURATION (33MHZ CPU)               |
   |------------------------------------------------------------|
   |   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  |
   |------------------------------------------------------------|
   |      Note: The location of banks 0 & 1 are unidentified.   |
   |      The speed for the cache is 15ns and 25ns for the TAG. |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |              CACHE CONFIGURATION (50MHZ CPU)               |
   |------------------------------------------------------------|
   |   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  |
   |------------------------------------------------------------|
   |      Note: The location of banks 0 & 1 are unidentified.   |
   |      The speed for the cache is 15ns and 20ns for the TAG. |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size |  W1  |  W2  | W3  | W5  |  W6  |  W7  |  W8  |  W9  |
   |------+------+------+-----+-----+------+------+------+------|
   | 64KB |1 & 2 | Open |1 & 2|1 & 2| Open | Open | Open | Open |
   |------+------+------+-----+-----+------+------+------+------|
   |128KB |2 & 3 |1 & 2 |1 & 2|2 & 3|Closed| Open | Open |Closed|
   |------+------+------+-----+-----+------+------+------+------|
   |256KB |1 & 2 |2 & 3 |2 & 3|2 & 3|Closed|Closed|Closed|Closed|
   |------------------------------------------------------------|
   |Note: Pins designated should be in the closed position.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CPU CLOCK SELECTION                     |
   |------------------------------------------------------------|
   |            Setting            |            W10             |
   |-------------------------------+----------------------------|
   |              1x               |            Open            |
   |-------------------------------+----------------------------|
   |              2x               |           Closed           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CPU TYPE SELECTION                     |
   |------------------------------------------------------------|
   |    Type    |           W11            |        W12         |
   |------------+--------------------------+--------------------|
   |  80486SX   |    Pins 2 & 3 closed     |        Open        |
   |------------+--------------------------+--------------------|
   |  80487SX   | Pins 1 & 2, 3 & 4 closed | Pins 2 & 3 closed  |
   |------------+--------------------------+--------------------|
   |  80486DX   | Pins 1 & 2, 3 & 4 closed | Pins 1 & 2 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      TURBO SELECTION                       |
   |------------------------------------------------------------|
   |      Setting       |        J10        |        JP1        |
   |--------------------+-------------------+-------------------|
   |      Enabled       |      Closed       |       Open        |
   |--------------------+-------------------+-------------------|
   |      Disabled      |       Open        |      Closed       |
   +------------------------------------------------------------+