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

   SYSTEM 220

   Processor         80286                                        
   Processor Speed   20MHz                                        
   Chip Set          VLSI                                         
   Max. Onboard DRAM 8MB                                          
   Cache             None                                         
   BIOS              AMI                                          
   Dimensions        362mm x 182mm                                
   I/O Options       16-bit riser card slot, floppy drive         
                     interface, IDE interface                     
                                                                  
                     parallel port, serial port (2), VGA feature  
                     connector, VGA port                          
   NPU Options       80287-8MHz                                   

<gopher://bitreich.org/I/th99/m/C-D/31338-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose        | Location | Purpose             | Location |
   |----------------+----------+---------------------+----------|
   | VGA port       |   CN1    | IDE interface       |   CN6    |
   |----------------+----------+---------------------+----------|
   | Parallel port  |   CN2    | VGA feature         |   CN7    |
   |----------------+----------+---------------------+----------|
   | Serial port 2  |   CN3    | Front panel         |   FPSL   |
   |                |          | switches & LEDs     |          |
   |----------------+----------+---------------------+----------|
   | Serial port 1  |   CN4    | 16-bit riser card   |    S1    |
   |----------------+----------+---------------------+----------|
   | Floppy drive   |   CN5    |                     |          |
   | interface      |          |                     |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |             Function              |  Jumper   |  Position  |
   |-----------------------------------+-----------+------------|
   |>> | Factory configured - do not   |    J1     |  unknown   |
   |   | alter                         |           |            |
   |---+-------------------------------+-----------+------------|
   |>> | Factory configured - do not   |    J2     |  unknown   |
   |   | alter                         |           |            |
   |---+-------------------------------+-----------+------------|
   |>> | Factory configured - do not   |    J3     |  unknown   |
   |   | alter                         |           |            |
   |---+-------------------------------+-----------+------------|
   |>> | Factory configured - do not   |    J4     |  unknown   |
   |   | alter                         |           |            |
   |---+-------------------------------+-----------+------------|
   |>> | Monitor type select color     |    W1     |   closed   |
   |---+-------------------------------+-----------+------------|
   |   | Monitor type select           |    W1     |    open    |
   |   | monochrome                    |           |            |
   |---+-------------------------------+-----------+------------|
   |>> | Serial port 2 (CN3) enabled   | W4/pins 1 |   closed   |
   |   |                               |    & 2    |            |
   |---+-------------------------------+-----------+------------|
   |   | Serial port 2 (CN3) disabled  | W4/pins 1 |    open    |
   |   |                               |    & 2    |            |
   |---+-------------------------------+-----------+------------|
   |>> | Serial port 1 (CN4) enabled   | W4/pins 3 |   closed   |
   |   |                               |    & 4    |            |
   |---+-------------------------------+-----------+------------|
   |   | Serial port 1 (CN4) disabled  | W4/pins 3 |    open    |
   |   |                               |    & 4    |            |
   |---+-------------------------------+-----------+------------|
   |>> | Parallel port (CN2) select    | W4/pins 5 |    open    |
   |   | LPT1                          |    & 6    |            |
   |   |                               |           |   closed   |
   |   |                               | W4/pins 7 |            |
   |   |                               |    & 8    |            |
   |---+-------------------------------+-----------+------------|
   |   | Parallel port (CN2) select    | W4/pins 5 |   closed   |
   |   | LPT2                          |    & 6    |            |
   |   |                               |           |    open    |
   |   |                               | W4/pins 7 |            |
   |   |                               |    & 8    |            |
   |---+-------------------------------+-----------+------------|
   |   | Parallel port disabled        | W4/pins 5 |    open    |
   |   |                               |    & 6    |            |
   |   |                               |           |    open    |
   |   |                               | W4/pins 7 |            |
   |   |                               |    & 8    |            |
   |---+-------------------------------+-----------+------------|
   |>> | IDE interface (CN6) enabled   |    W5     |   closed   |
   |---+-------------------------------+-----------+------------|
   |   | IDE interface (CN6) disabled  |    W5     |    open    |
   |---+-------------------------------+-----------+------------|
   |>> | Floppy drive interface (CN5)  |    W6     |   closed   |
   |   | enabled                       |           |            |
   |---+-------------------------------+-----------+------------|
   |   | Floppy drive interface (CN5)  |    W6     |    open    |
   |   | disabled                      |           |            |
   |---+-------------------------------+-----------+------------|
   |>> | IDE interleave select 1:1     |    W7     | pins 2 & 3 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |   | IDE interleave select 3:1     |    W7     | pins 1 & 2 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |>> | VGA port enabled              |    W11    |    open    |
   |---+-------------------------------+-----------+------------|
   |   | VGA port disabled             |    W11    | pins 1 & 2 |
   |   |                               |           |   closed   |
   |---+-------------------------------+-----------+------------|
   |>> | Factory configured - do not   |    W15    | pins 1 & 2 |
   |   | alter                         |           |   closed   |
   |   |                               |    W16    |            |
   |   |                               |           |    open    |
   |------------------------------------------------------------|
   | Note:The location of Jumpers W5 and W6 are unverified.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 BASE MEMORY CONFIGURATION                  |
   |------------------------------------------------------------|
   |  Select   |      W10       |      W12      |      W13      |
   |-----------+----------------+---------------+---------------|
   |>> | 640KB |      open      |  pins 1 & 2   |  pins 2 & 3   |
   |   |       |                |    closed     |    closed     |
   |---+-------+----------------+---------------+---------------|
   |   | 256KB |   pins 1 & 2   |  pins 2 & 3   |  pins 1 & 2   |
   |   |       |     closed     |    closed     |    closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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     |
   +------------------------------------------------------------+