UNIDENTIFIED
============

   XTT

   Processor              8088                                    
   Processor Speed        4.77/8MHz                               
   Chip Set               Unidentified                            
   Video Chip Set         None                                    
   Maximum Onboard Memory 640KB                                   
   Maximum Video Memory   None                                    
   Cache                  None                                    
   BIOS                   Unidentified                            
   Dimensions             330mm x 218mm                           
   I/O Options            None                                    
   NPU Options            8087                                    

<gopher://bitreich.org/I/th99/m/U-Z/33680-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose             |  Location  | Purpose      | Location |
   |---------------------+------------+--------------+----------|
   | Power LED & keylock |    JP7     | Turbo switch | JP8 pins |
   |                     |            |              |  3 & 4   |
   |---------------------+------------+--------------+----------|
   | Reset switch        | JP8 pins 1 | Speaker      |   JP9    |
   |                     |    & 2     |              |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Label |  Position  |
   |---------------------------------------+-------+------------|
   |   | Wait state select 3 wait states   |  JP3  | Pins 2 & 3 |
   |   |                                   |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | Wait state select 2 wait states   |  JP3  | Pins 1 & 2 |
   |   |                                   |       |   closed   |
   |---+-----------------------------------+-------+------------|
   |   | SW1/5 is set to on                |  JP5  |   Closed   |
   |---+-----------------------------------+-------+------------|
   |   | SW1/5 is set to off               |  JP5  |    Open    |
   |---+-----------------------------------+-------+------------|
   |>> | Factory configured - do not alter | SW1/1 |    Off     |
   |---+-----------------------------------+-------+------------|
   |   | NPU not installed                 | SW1/2 |     On     |
   |---+-----------------------------------+-------+------------|
   |   | NPU installed                     | SW1/2 |    Off     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |  Size   |   Bank 0   |   Bank 1   |   Bank 2   |  Bank 3   |
   |---------+------------+------------+------------+-----------|
   |  256KB  | (9) 41256  |    None    |    None    |   None    |
   |---------+------------+------------+------------+-----------|
   |  512KB  | (9) 41256  | (9) 41256  |    None    |   None    |
   |---------+------------+------------+------------+-----------|
   |  640KB  | (9) 41256  | (9) 41256  | (9) 41256  |   None    |
   |---------+------------+------------+------------+-----------|
   |  640KB  | (9) 41256  | (9) 41256  |  (9) 4164  | (9) 4164  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   |   Number of banks with 41256    |           JP4            |
   |         chips installed         |                          |
   |---------------------------------+--------------------------|
   |                0                | Pins 1 & 3, 2 & 4 closed |
   |---------------------------------+--------------------------|
   |                1                |    Pins 2 & 4 closed     |
   |---------------------------------+--------------------------|
   |                2                |    Pins 1 & 3 closed     |
   |---------------------------------+--------------------------|
   |                3                |           Open           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM SWITCH CONFIGURATION                  |
   |------------------------------------------------------------|
   |     Banks used     |       SW1/3       |       SW1/4       |
   |--------------------+-------------------+-------------------|
   |         1          |        On         |        On         |
   |--------------------+-------------------+-------------------|
   |         2          |        On         |        Off        |
   |--------------------+-------------------+-------------------|
   |         3          |        Off        |        On         |
   |--------------------+-------------------+-------------------|
   |         4          |        Off        |        Off        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CPU SPEED SELECTION                     |
   |------------------------------------------------------------|
   |             Speed             |            JP6             |
   |-------------------------------+----------------------------|
   |  Switchable through keyboard  |     Pins 1 & 2 closed      |
   |-------------------------------+----------------------------|
   |            4.77MHz            |            Open            |
   |-------------------------------+----------------------------|
   |             8MHz              |     Pins 2 & 3 closed      |
   +------------------------------------------------------------+

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

   +------------------------------------------------------------+
   |                     MONITOR SELECTION                      |
   |------------------------------------------------------------|
   |        Type        |       SW1/5       |       SW1/6       |
   |--------------------+-------------------+-------------------|
   |        EGA         |        On         |        On         |
   |--------------------+-------------------+-------------------|
   |  Color (80 x 25)   |        On         |        Off        |
   |--------------------+-------------------+-------------------|
   |  Color (40 x 25)   |        Off        |        On         |
   |--------------------+-------------------+-------------------|
   |     Monochrome     |        Off        |        Off        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                       BIOS SELECTION                       |
   |------------------------------------------------------------|
   | Type  |                        JP2                         |
   |-------+----------------------------------------------------|
   | 2764  |  Pins 3 & 15, 4 & 14, 5 & 13, 6 & 12, 7 & 11, 8 &  |
   |       |                     10 closed                      |
   |-------+----------------------------------------------------|
   | 27128 |  Pins 2 & 15, 3 & 14, 4 & 13, 5 & 12, 6 & 11, 7 &  |
   |       |                     10 closed                      |
   |-------+----------------------------------------------------|
   | 27256 |  Pins 1 & 15, 2 & 14, 3 & 13, 4 & 12, 5 & 11, 6 &  |
   |       |                     10 closed                      |
   +------------------------------------------------------------+