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

   DIMENSION XPS XXX MDT II

Device     Mainboard                                                     
Type       
Processor  80486SX/80486DX/80486DX2/80486DX4/P24T                        
Processor  25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz 
Speed      
Chip Set   Unidentified                                                  
Maximum    64MB                                                          
Onboard    
Memory     
Cache      256KB                                                         
BIOS       Unidentified                                                  
Dimensions 330mm x 218mm                                                 
I/O        32-bit VESA local bus slots (2), floppy drive interface, IDE  
Options    interfaces (2), parallel port, PS/2 mouse port, serial ports  
           (2)                                                           

<gopher://bitreich.org/I/th99/m/C-D/35948-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |    C1    | Serial port 1    |   CN2    |
   |-------------------+----------+------------------+----------|
   | Turbo switch      |    C2    | IDE interface 2  |   CN3    |
   |-------------------+----------+------------------+----------|
   | Speaker           |    C3    | IDE interface 1  |   CN4    |
   |-------------------+----------+------------------+----------|
   | Reset switch      |    C4    | Floppy drive     |   CN5    |
   |                   |          | interface        |          |
   |-------------------+----------+------------------+----------|
   | Power LED &       |    C5    | PS/2 mouse port  |   J13    |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | IDE interface LED |    C6    | Parallel port    |   J16    |
   |-------------------+----------+------------------+----------|
   | Serial port 2     |   CN1    | 32-bit VESA      |  SL1 &   |
   |                   |          | local bus slots  |   SL2    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                USER CONFIGURABLE SETTINGS                 ||
   |-----------------------------------------------------------||
   |               Function               | Label |  Position  ||
   |--------------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W1   |   Closed   ||
   |   | alter                            |       |            ||
   |---+----------------------------------+-------+------------||
   |>> | Monitor type select color        |  W2   |   Closed   ||
   |---+----------------------------------+-------+------------||
   |   | Monitor type select monochrome   |  W2   |    Open    ||
   |---+----------------------------------+-------+------------||
   |>> | PS/2 mouse IRQ12 enabled         |  W3   |   Closed   ||
   |---+----------------------------------+-------+------------||
   |   | PS/2 mouse IRQ12 disabled        |  W3   |    Open    ||
   |---+----------------------------------+-------+------------||
   |>> | CMOS memory normal operation     |  W5   |    Open    ||
   |---+----------------------------------+-------+------------||
   |   | CMOS memory clear                |  W5   |   Closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W8   | Pins 1 & 2 ||
   |   | alter                            |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W10  | Pins 1 & 2 ||
   |   | alter                            |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W11  | Pins 1 & 2 ||
   |   | alter                            |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W13  |    Open    ||
   |   | alter                            |       |            ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W16  | Pins 1 & 2 ||
   |   | alter                            |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W17  | Pins 1 & 2 ||
   |   | alter                            |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W18  |    Open    ||
   |   | alter                            |       |            ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W19  |   Closed   ||
   |   | alter                            |       |            ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W22  | Pins 1 & 2 ||
   |   | alter                            |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W23  | Pins 1 & 2 ||
   |   | alter                            |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W24  | Pins 1 & 2 ||
   |   | alter                            |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W25  |    Open    ||
   |   | alter                            |       |            ||
   |---+----------------------------------+-------+------------||
   |>> | IDE interface 1 enabled          |  W34  | Pins 2 & 3 ||
   |   |                                  |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |   | IDE interface 1 disabled         |  W34  | Pins 1 & 2 ||
   |   |                                  |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W35  |    Open    ||
   |   | alter                            |       |            ||
   |---+----------------------------------+-------+------------||
   |>> | Parallel port IRQ select IRQ7    |  W36  | Pins 2 & 3 ||
   |   |                                  |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |   | Parallel port IRQ select IRQ5    |  W36  | Pins 1 & 2 ||
   |   |                                  |       |   closed   ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W39  |    Open    ||
   |   | alter                            |       |            ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      |  W40  |    Open    ||
   |   | alter                            |       |            ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      | SW1/2 |     On     ||
   |   | alter                            |       |            ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      | SW1/3 |    Off     ||
   |   | alter                            |       |            ||
   |---+----------------------------------+-------+------------||
   |>> | Factory configured - do not      | SW1/4 |    Off     ||
   |   | alter                            |       |            ||
   |------------------------------------------------------------|
   | Note: The location of the factory configured jumpers are   |
   | unidentified.                                              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     SIMM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (1) 1M x 36 |    None     |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (1) 1M x 36 | (1) 1M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 12MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 4M x 36 |    None     |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 20MB | (1) 4M x 36 | (1) 1M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 24MB | (1) 4M x 36 | (1) 1M x 36 |  (1) 1M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 28MB | (1) 4M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 32MB | (1) 4M x 36 | (1) 4M x 36 |    None    |    None    |
   |------+-------------+-------------+------------+------------|
   | 36MB | (1) 1M x 36 | (1) 4M x 36 |  (1) 4M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 48MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |    None    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 52MB | (1) 1M x 36 | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 64MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |
   |      |             |             |     36     |     36     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |            Size            |            Bank 0             |
   |----------------------------+-------------------------------|
   |           256KB            |          (8) 32K x 8          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CPU SPEED SELECTION                     |
   |------------------------------------------------------------|
   |             Speed             |           SW1/1            |
   |-------------------------------+----------------------------|
   |             25MHz             |            Off             |
   |-------------------------------+----------------------------|
   |             33MHz             |             On             |
   |-------------------------------+----------------------------|
   |            50iMHz             |            Off             |
   |-------------------------------+----------------------------|
   |            66iMHz             |             On             |
   |-------------------------------+----------------------------|
   |            75iMHz             |            Off             |
   |-------------------------------+----------------------------|
   |            100iMHz            |             On             |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     CPU TYPE SELECTION                     |
   |------------------------------------------------------------|
   |            Type            |              W12              |
   |----------------------------+-------------------------------|
   |          80486SX           |       Pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |          80486DX           |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |          80486DX2          |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |          80486DX4          |       Pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |            P24T            |       Pins 1 & 2 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   DMA CHANNEL SELECTION                    |
   |------------------------------------------------------------|
   |     Channel      |        W37         |        W38         |
   |------------------+--------------------+--------------------|
   |        1         | Pins 2 & 3 closed  | Pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |       >> 3        | Pins 1 & 2 closed  | Pins 1 & 2 closed  |
   +------------------------------------------------------------+