DELL COMPUTER CORPORATION
=========================

   SYSTEM 4XX/P NETPLEX

   Processor       80486SX/80486DX/80486DX2                       
   Processor Speed 25/33/50(internal)/50/66(internal)MHz          
   Chip Set        SIS                                            
   Max. Onboard    32MB                                           
   DRAM            
   Cache           128KB                                          
   BIOS            Phoenix                                        
   Dimensions      330mm x 218mm                                  
   I/O Options     Bus mouse port, floppy drive interface, IDE    
                   interface, parallel port, riser card slot,     
                   serial ports (2), VGA feature connector, VGA   
                   port                                           
   NPU Options     None                                           

<gopher://bitreich.org/I/th99/m/C-D/31952-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose        | Location | Purpose             | Location |
   |----------------+----------+---------------------+----------|
   | Bus mouse port |   CN1    | VGA feature         |   CN6    |
   |                |          | connector           |          |
   |----------------+----------+---------------------+----------|
   | Serial port 1  |   CN2    | IDE interface LED   |   CN7    |
   |----------------+----------+---------------------+----------|
   | Serial port 2  |   CN3    | Floppy drive        |   CN8    |
   |                |          | interface           |          |
   |----------------+----------+---------------------+----------|
   | Parallel port  |   CN4    | IDE interface LED   |   JP5    |
   |----------------+----------+---------------------+----------|
   | VGA port       |   CN5    | Riser card slot     |    S1    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper  | Position  |
   |--------------------------------------+---------+-----------|
   |>> | VGA IRQ9 disabled                |   JP1   |   Open    |
   |---+----------------------------------+---------+-----------|
   |   | VGA IRQ9 enabled                 |   JP1   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |>> | Monitor type select color        |   JP2   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |   | Monitor type select monochrome   |   JP2   |   Open    |
   |---+----------------------------------+---------+-----------|
   |>> | Password enabled                 |   JP7   |  Closed   |
   |---+----------------------------------+---------+-----------|
   |   | Password disabled                |   JP7   |   Open    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                PARALLEL PORT CONFIGURATION                 |
   |------------------------------------------------------------|
   |            Port            |              JP6              |
   |----------------------------+-------------------------------|
   |         LPT 1/IRQ7         |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |         LPT 1/IRQ5         |       pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |         LPT 3/IRQ7         |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |          Disabled          |             Open              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 1       |       Bank 2       |
   |------------------+--------------------+--------------------|
   |       4MB        |    (1) 1M x 36     |        NONE        |
   |------------------+--------------------+--------------------|
   |       5MB        |    (1) 1M x 36     |   (1) 256K x 36    |
   |------------------+--------------------+--------------------|
   |       8MB        |    (1) 1M x 36     |    (1) 1M x 36     |
   |------------------+--------------------+--------------------|
   |       16MB       |    (1) 4M x 36     |        NONE        |
   |------------------+--------------------+--------------------|
   |       17MB       |    (1) 4M x 36     |   (1) 256K x 36    |
   |------------------+--------------------+--------------------|
   |       20MB       |    (1) 4M x 36     |    (1) 1M x 36     |
   |------------------+--------------------+--------------------|
   |       32MB       |    (1) 4M x 36     |    (1) 4M x 36     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  VIDEO RAM CONFIGURATION                   |
   |------------------------------------------------------------|
   |     Size      |        Bank 0        |       Bank 1        |
   |---------------+----------------------+---------------------|
   |     512KB     |    (4) 256KB x 4     |        NONE         |
   |---------------+----------------------+---------------------|
   |      1MB      |    (4) 256KB x 4     |    (4) 256KB x 4    |
   |------------------------------------------------------------|
   | Note:Bank 0 is factory installed and is not configurable.  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |           CPU speed           |            JP3             |
   |-------------------------------+----------------------------|
   |             25MHz             |           Closed           |
   |-------------------------------+----------------------------|
   |             33MHz             |            Open            |
   |-------------------------------+----------------------------|
   |            50iMHz             |           Closed           |
   |-------------------------------+----------------------------|
   |            66iMHz             |            Open            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                      CPU TYPE SELECT                       |
   |------------------------------------------------------------|
   |   CPU type    |    JP4 A-C    |    JP4D-F    |   JP4G-I    |
   |---------------+---------------+--------------+-------------|
   |    80486SX    |    Closed     |     Open     |    Open     |
   |---------------+---------------+--------------+-------------|
   |    80487SX    |     Open      |     Open     |   Closed    |
   |---------------+---------------+--------------+-------------|
   |    80486DX    |     Open      |    Closed    |    Open     |
   |---------------+---------------+--------------+-------------|
   |   80486DX2    |     Open      |    Closed    |    Open     |
   +------------------------------------------------------------+