(TXT) View Source
       
       # UNIDENTIFIED
       
          U486
       
          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                                    
       
 (IMG) IMG 1
          
       
          +------------------------------------------------------------+
          |                        CONNECTIONS                         |
          |------------------------------------------------------------|
          | Purpose             | Location | Purpose        | Location |
          |---------------------+----------+----------------+----------|
          | External battery    |    J3    | Turbo switch   |   J10    |
          |---------------------+----------+----------------+----------|
          | Speaker             |    J8    | Turbo LED      |   J11    |
          |---------------------+----------+----------------+----------|
          | Power LED & keylock |    J9    | Reset switch   |   J12    |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 USER CONFIGURABLE SETTINGS                 |
          |------------------------------------------------------------|
          |               Function                | Label |  Position  |
          |---------------------------------------+-------+------------|
          | » | Battery type select internal      |  J1   |   Closed   |
          |---+-----------------------------------+-------+------------|
          |   | Battery type select external      |  J1   |    Open    |
          |---+-----------------------------------+-------+------------|
          | » | Keyboard clock select synchronous |  J5   | Pins 2 & 3 |
          |   |                                   |       |   closed   |
          |---+-----------------------------------+-------+------------|
          |   | Keyboard clock select             |  J5   | Pins 1 & 2 |
          |   | asynchronous                      |       |   closed   |
          |---+-----------------------------------+-------+------------|
          | » | Monitor type select color         |  J6   |   Closed   |
          |---+-----------------------------------+-------+------------|
          |   | Monitor type select monochrome    |  J6   |    Open    |
          |---+-----------------------------------+-------+------------|
          | » | CMOS memory normal operation      |  J13  | Pins 1 & 2 |
          |   |                                   |       |   closed   |
          |---+-----------------------------------+-------+------------|
          |   | CMOS memory clear                 |  J13  | Pins 2 & 3 |
          |   |                                   |       |   closed   |
          |---+-----------------------------------+-------+------------|
          | » | Turbo sped disabled               |  JP1  |   Closed   |
          |---+-----------------------------------+-------+------------|
          |   | Turbo speed enabled               |  JP1  |    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     |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                    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  |
          |------------------------------------------------------------|
          | Note: The location of banks 0 & 1 are unidentified.        |
          +------------------------------------------------------------+
       
          +------------------------------------------------------------+
          |                 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 MODE SELECTION                  |
          |------------------------------------------------------------|
          |            Speed            |             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  |
          +------------------------------------------------------------+