DTK COMPUTER, INC.
==================

   TURBO 640

   Processor             8088-2                                   
   Processor Speed       8MHz                                     
   Chip Set              None                                     
   Max. Onboard DRAM     640K                                     
   Cache                 None                                     
   BIOS                  DTK/ERSO                                 
   Dimensions            330mm x 218mm                            
   I/O Options           None                                     
   NPU Options           8087-2                                   

<gopher://bitreich.org/I/th99/m/C-D/30501-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose               | Location | Purpose      | Location |
   |-----------------------+----------+--------------+----------|
   | Reset switch          |   JP1    | Turbo switch |   JP5    |
   |-----------------------+----------+--------------+----------|
   | Power LED & turbo LED |   JP2    | Keylock      |   JP8    |
   |-----------------------+----------+--------------+----------|
   | Speaker               |   JP4    |              |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |            Function             | Jumper/Switch | Position |
   |---------------------------------+---------------+----------|
   |>> | Factory configured - do not | SW1/switch 1  |   Off    |
   |   | alter                       |               |          |
   |---+-----------------------------+---------------+----------|
   |>> | NPU absent                  | SW1/switch 2  |   Off    |
   |---+-----------------------------+---------------+----------|
   |   | NPU present                 | SW1/switch 2  |    On    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |  Size   |   Bank 0   |   Bank 1   |   Bank 2   |  Bank 3   |
   |---------+------------+------------+------------+-----------|
   |  64KB   |  (9) 4164  |    NONE    |    NONE    |   NONE    |
   |---------+------------+------------+------------+-----------|
   |  128KB  |  (9) 4164  |  (9) 4164  |    NONE    |   NONE    |
   |---------+------------+------------+------------+-----------|
   |  192KB  |  (9) 4164  |  (9) 4164  |  (9) 4164  |   NONE    |
   |---------+------------+------------+------------+-----------|
   |  256KB  |  (9) 4164  |  (9) 4164  |  (9) 4164  | (9) 4164  |
   |---------+------------+------------+------------+-----------|
   |  256KB  | (9) 41256  |    NONE    |    NONE    |   NONE    |
   |---------+------------+------------+------------+-----------|
   |  512KB  | (9) 41256  | (9) 41256  |    NONE    |   NONE    |
   |---------+------------+------------+------------+-----------|
   |  576KB  | (9) 41256  | (9) 41256  |  (9) 4164  |   NONE    |
   |---------+------------+------------+------------+-----------|
   |  640KB  | (9) 41256  | (9) 41256  |  (9) 4164  | (9) 4164  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   |       Size       | JPA  | JPB  | JPC  | JPD  | JPE  | JPF  |
   |------------------+------+------+------+------+------+------|
   |       64KB       |Closed|Closed| Open | Open | Open |Closed|
   |------------------+------+------+------+------+------+------|
   |      128KB       |Closed|Closed| Open | Open | Open |Closed|
   |------------------+------+------+------+------+------+------|
   |      192KB       |Closed|Closed| Open | Open | Open |Closed|
   |------------------+------+------+------+------+------+------|
   |256KB (using 4164)|Closed|Closed| Open | Open | Open |Closed|
   |------------------+------+------+------+------+------+------|
   |   256KB (using   | Open | Open |Closed|Closed|Closed| Open |
   |      41256)      |      |      |      |      |      |      |
   |------------------+------+------+------+------+------+------|
   |      512KB       | Open | Open |Closed|Closed|Closed| Open |
   |------------------+------+------+------+------+------+------|
   |      576KB       | Open | Open |Closed|Closed|Closed| Open |
   |------------------+------+------+------+------+------+------|
   |      640KB       | Open | Open |Closed|Closed|Closed| Open |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |           Setting            |     JP6      |     JP7      |
   |------------------------------+--------------+--------------|
   | Switchable from turbo switch |    Closed    |     Open     |
   |------------------------------+--------------+--------------|
   |   Switchable from keyboard   |     Open     |    Closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 FLOPPY DRIVE CONFIGURATION                 |
   |------------------------------------------------------------|
   |  Drives installed  |       SW1/7       |       SW1/8       |
   |--------------------+-------------------+-------------------|
   |         1          |        On         |        On         |
   |--------------------+-------------------+-------------------|
   |         2          |        Off        |        On         |
   |--------------------+-------------------+-------------------|
   |         3          |        On         |        Off        |
   |--------------------+-------------------+-------------------|
   |         4          |        Off        |        Off        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   MONITOR CONFIGURATION                    |
   |------------------------------------------------------------|
   |        Type        |       SW1/5       |       SW1/6       |
   |--------------------+-------------------+-------------------|
   |    EGA or none     |        On         |        On         |
   |--------------------+-------------------+-------------------|
   |    40 x 25 CGA     |        Off        |        On         |
   |--------------------+-------------------+-------------------|
   |    80 x 25 CGA     |        On         |        Off        |
   |--------------------+-------------------+-------------------|
   |     Monochrome     |        Off        |        Off        |
   +------------------------------------------------------------+