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

   DIMENSION 386SX/25

   Processor         80386SX                                      
   Processor Speed   25MHz                                        
   Chip Set          VLSI Topcat                                  
   Max. Onboard DRAM 16MB                                         
   SRAM Cache        None                                         
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       Floppy drive interface, IDE interface, Bus   
                     mouse port                                   
                                                                  
                     parallel port, serial port (2), VGA port     
   NPU Options       80387SX                                      

<gopher://bitreich.org/I/th99/m/C-D/31331-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose              | Location | Purpose       | Location |
   |----------------------+----------+---------------+----------|
   | Serial port (COM A)  |    P3    | VGA port      |   P10    |
   |----------------------+----------+---------------+----------|
   | Parallel port        |    P4    | Reset switch  |   P11    |
   |----------------------+----------+---------------+----------|
   | Floppy drive         |    P5    | Speaker       |   P12    |
   | interface            |          |               |          |
   |----------------------+----------+---------------+----------|
   | IDE interface        |    P6    | Power LED &   |   P13    |
   |                      |          | keylock       |          |
   |----------------------+----------+---------------+----------|
   | Serial port (COM B)  |    P7    | Turbo LED     |   P14    |
   |----------------------+----------+---------------+----------|
   | Bus mouse            |    P9    | IDE interface |   P15    |
   |                      |          | LED           |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function             |   Jumper   |  Position  |
   |----------------------------------+------------+------------|
   |>> | VGA port enabled             |    JP1     | pins 2 & 3 |
   |   |                              |            |   closed   |
   |   |                              |    JP2     |            |
   |   |                              |            | pins 1 & 2 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | VGA port disabled            |    JP1     | pins 1 & 2 |
   |   |                              |            |   closed   |
   |   |                              |    JP2     |            |
   |   |                              |            | pins 2 & 3 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |>> | Single IDE drive installed   |    JP3     | pins 1 & 2 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | Dual IDE drive installed     |    JP3     | pins 2 & 3 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |>> | Pipeline mode enabled        |    JP4     | pins 2 & 3 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | Pipeline mode disabled       |    JP4     | pins 1 & 2 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |>> | Floppy drive disk change     |    JP5     | pins 1 & 2 |
   |   | signal disabled              |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | Floppy drive disk change     |    JP5     | pins 2 & 3 |
   |   | signal enabled               |            |   closed   |
   |---+------------------------------+------------+------------|
   |>> | Monitor type select color    |    JP6     | pins 1 & 2 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | Monitor type select          |    JP6     | pins 2 & 3 |
   |   | monochrome                   |            |   closed   |
   |---+------------------------------+------------+------------|
   |>> | CMOS memory normal operation |    JP7     | pins 2 & 3 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |   | CMOS memory clear            |    JP7     | pins 1 & 2 |
   |   |                              |            |   closed   |
   |---+------------------------------+------------+------------|
   |>> | Monitor type select          | SW1/switch |    open    |
   |   | Non-MultiSync I              |     1      |            |
   |---+------------------------------+------------+------------|
   |   | Monitor type select          | SW1/switch |   closed   |
   |   | MultiSync I                  |     1      |            |
   |---+------------------------------+------------+------------|
   |>> | VGA style select PS/2        | SW1/switch |   closed   |
   |   |                              |     2      |            |
   |---+------------------------------+------------+------------|
   |   | VGA style select AT          | SW1/switch |    open    |
   |   |                              |     2      |            |
   |---+------------------------------+------------+------------|
   |>> | Select 1024 x 768 interlaced | SW1/switch |    open    |
   |   |                              |     5      |            |
   |---+------------------------------+------------+------------|
   |   | Select 1024 x 768            | SW1/switch |   closed   |
   |   | non-interlaced               |     5      |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 REFRESH RATE CONFIGURATION                 |
   |------------------------------------------------------------|
   |        Mode 800 x 600        | SW1/switch 3 | SW1/switch 4 |
   |------------------------------+--------------+--------------|
   | 16 colors @ 72Hz/256 colors  |     open     |     open     |
   |            @ 60Hz            |              |              |
   |------------------------------+--------------+--------------|
   | 16 colors @ 60Hz/256 colors  |     open     |    closed    |
   |            @ 60Hz            |              |              |
   |------------------------------+--------------+--------------|
   | 16 colors @ 72Hz/256 colors  |    closed    |     open     |
   |            @ 56Hz            |              |              |
   |------------------------------+--------------+--------------|
   | 16 colors @ 56Hz/256 colors  |    closed    |    closed    |
   |           @ 56 Hz            |              |              |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       1MB        |    (2) 256K x 9    |    (2) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       2MB        |     (2) 1M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       4MB        |     (2) 1M x 9     |     (2) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       8MB        |     (2) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       10MB       |     (2) 4M x 9     |     (2) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (2) 4M x 9     |     (2) 4M x 9     |
   +------------------------------------------------------------+