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

   4XX/ME, 4XXS/ME

   Processor    80486SX/80486DX/80486DX2                          
   Processor    25/33/50(internal)/66(internal)MHz                
   Speed        
   Chip Set     Intel                                             
   Max. Onboard 64MB                                              
   DRAM         
   Cache        128KB (on external cache card)                    
   BIOS         Phoenix                                           
   Dimensions   330mm x 218mm                                     
   I/O Options  Floppy drive interface, IDE interface, parallel   
                port, PS/2 mouse port, serial ports (2), VGA      
                feature connector, VGA port                       
   NPU Options  None                                              

<gopher://bitreich.org/I/th99/m/C-D/32160-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | PS/2 mouse port  |   CN1    | IDE interface     |   CN8    |
   |------------------+----------+-------------------+----------|
   | Serial port 1    |   CN2    | IDE interface LED |    J1    |
   |------------------+----------+-------------------+----------|
   | Serial port 2    |   CN3    | Chassis fan power |    J2    |
   |------------------+----------+-------------------+----------|
   | Parallel port    |   CN4    | External battery  |    J3    |
   |------------------+----------+-------------------+----------|
   | VGA port         |   CN5    | Front panel       |    J4    |
   |                  |          | connector         |          |
   |------------------+----------+-------------------+----------|
   | VGA feature      |   CN6    | External cache    |   SL1    |
   | connector        |          | card slot         |          |
   |------------------+----------+-------------------+----------|
   | Floppy drive     |   CN7    |                   |          |
   | interface        |          |                   |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                Function                | Jumper | Position |
   |----------------------------------------+--------+----------|
   |>> | External cache card not installed  |  JP1   |   Open   |
   |   | (486/M mainboard only)             |        |          |
   |---+------------------------------------+--------+----------|
   |   | External cache card installed      |  JP1   |  Closed  |
   |   | (486/M mainboard only)             |        |          |
   |---+------------------------------------+--------+----------|
   |>> | Password enabled                   |  JP2   |  Closed  |
   |---+------------------------------------+--------+----------|
   |   | Password disabled                  |  JP2   |   Open   |
   |---+------------------------------------+--------+----------|
   |>> | Factory configured - do not alter  |  JP3   |   Open   |
   |---+------------------------------------+--------+----------|
   |>> | BIOS & EISA upgrade from diskette  |  JP4   |  Closed  |
   |   | enabled                            |        |          |
   |---+------------------------------------+--------+----------|
   |   | BIOS & EISA upgrade from diskette  |  JP4   |   Open   |
   |   | disabled                           |        |          |
   |---+------------------------------------+--------+----------|
   |>> | On board VGA enabled               |  JP5   |  Closed  |
   |---+------------------------------------+--------+----------|
   |   | On board VGA disabled              |  JP5   |   Open   |
   |---+------------------------------------+--------+----------|
   |>> | EISA configuration retained at     |  JP7   |   Open   |
   |   | boot                               |        |          |
   |---+------------------------------------+--------+----------|
   |   | EISA configuration cleared at boot |  JP7   |  Closed  |
   |---+------------------------------------+--------+----------|
   |>> | Factory configured - do not alter  |  JP11  |   Open   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM 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) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 4M x 36 |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 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) 4M x 36 | (1) 4M x 36 |  (1) 1M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 40MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 48MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 52MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 64MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |
   |      |             |             |     36     |     36     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |            Speed             |             JP6             |
   |------------------------------+-----------------------------|
   |            25MHz             |           Closed            |
   |------------------------------+-----------------------------|
   |            33MHz             |            Open             |
   |------------------------------+-----------------------------|
   |            50iMHz            |           Closed            |
   |------------------------------+-----------------------------|
   |            66iMHz            |            Open             |
   +------------------------------------------------------------+

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