TANDON CORPORATION
==================

   MODEL 189230

   Processor              80286                                   
   Processor Speed        6/8/10MHz                               
   Chip Set               Unidentified                            
   Maximum Onboard Memory 3MB (2MB on external memory card)       
   Cache                  None                                    
   BIOS                   Unidentified                            
   Dimensions             355mm x 305mm                           
   I/O Options            None                                    
   NPU Options            80287                                   

<gopher://bitreich.org/I/th99/m/S-T/33278-1.png>
   

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |                Setting                | Label  | Position  |
   |---------------------------------------+--------+-----------|
   |>> | Factory configured - do not alter | SW1/1  |    N/A    |
   |---+-----------------------------------+--------+-----------|
   |>> | Factory configured - do not alter | SW1/2  |    N/A    |
   |---+-----------------------------------+--------+-----------|
   |>> | Video type select 80 characters   | SW1/3  |    Off    |
   |---+-----------------------------------+--------+-----------|
   |>> | Factory configured - do not alter | SW1/4  |    Off    |
   |---+-----------------------------------+--------+-----------|
   |>> | Factory configured - do not alter | SW1/5  |    N/A    |
   |---+-----------------------------------+--------+-----------|
   |>> | Factory configured - do not alter | SW1/6  |    N/A    |
   |---+-----------------------------------+--------+-----------|
   |>> | Factory configured - do not alter | SW1/7  |    N/A    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                            DRAM                            |
   |------------------------------------------------------------|
   | Note: The orientation and chip sizes are unidentified.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                        DRAM SWITCH                         |
   |------------------------------------------------------------|
   |   Expansion size   |     Total size     |      SW1/8       |
   |--------------------+--------------------+------------------|
   |       128KB        |       640KB        |       Off        |
   |--------------------+--------------------+------------------|
   |       512KB        |        1MB         |        On        |
   +------------------------------------------------------------+

<gopher://bitreich.org/I/th99/m/S-T/33278-2.png>
   

   +------------------------------------------------------------+
   |                            DRAM                            |
   |------------------------------------------------------------|
   |  Size  |   Bank 0   |   Bank 1   |   Bank 2   |   Bank 3   |
   |--------+------------+------------+------------+------------|
   | 512KB  | (18) 41256 |    None    |    None    |    None    |
   |--------+------------+------------+------------+------------|
   |  1MB   | (18) 41256 | (18) 41256 |    None    |    None    |
   |--------+------------+------------+------------+------------|
   | 1.5MB  | (18) 41256 | (18) 41256 | (18) 41256 |    None    |
   |--------+------------+------------+------------+------------|
   |  2MB   | (18) 41256 | (18) 41256 | (18) 41256 | (18) 41256 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    DRAM SWITCH (CON'T)                     |
   |------------------------------------------------------------|
   |Memory before|Memory after |SW1/1 |SW1/2 |SW1/3 |SW1/4|SW1/5|
   |-------------+-------------+------+------+------+-----+-----|
   |  512-640KB  | 2560-2688KB | Off  | Off  | Off  | On  | Off |
   |-------------+-------------+------+------+------+-----+-----|
   |   1024KB    |   3072KB    | Off  | Off  | Off  | On  | On  |
   |-------------+-------------+------+------+------+-----+-----|
   | 2560-2688KB | 4608-4736KB | Off  | Off  |  On  | On  | Off |
   |-------------+-------------+------+------+------+-----+-----|
   |   3072KB    |   5120KB    | Off  | Off  |  On  | On  | On  |
   |-------------+-------------+------+------+------+-----+-----|
   | 4608-4736KB | 6656-6784KB | Off  |  On  | Off  | On  | Off |
   |-------------+-------------+------+------+------+-----+-----|
   |   5120KB    |   7168KB    | Off  |  On  | Off  | On  | On  |
   |-------------+-------------+------+------+------+-----+-----|
   | 656-6784KB  | 8704-8832KB | Off  |  On  |  On  | On  | Off |
   |-------------+-------------+------+------+------+-----+-----|
   |   7168KB    |   9216KB    | Off  |  On  |  On  | On  | On  |
   |-------------+-------------+------+------+------+-----+-----|
   | 8704-8832KB |10752-10880KB|  On  | Off  | Off  | On  | Off |
   |-------------+-------------+------+------+------+-----+-----|
   |   9216KB    |   11264KB   |  On  | Off  | Off  | On  | On  |
   |-------------+-------------+------+------+------+-----+-----|
   |10752-10880KB|12800-12928KB|  On  | Off  |  On  | On  | Off |
   |-------------+-------------+------+------+------+-----+-----|
   |   11264KB   |   13312KB   |  On  | Off  |  On  | On  | On  |
   |-------------+-------------+------+------+------+-----+-----|
   |12800-12928KB|14848-14976KB|  On  |  On  | Off  | On  | Off |
   |-------------+-------------+------+------+------+-----+-----|
   |   13312KB   |   15360KB   |  On  |  On  | Off  | On  | On  |
   |-------------+-------------+------+------+------+-----+-----|
   |14848-14976KB|   15744KB   |  On  |  On  |  On  | On  | Off |
   |-------------+-------------+------+------+------+-----+-----|
   |   15360KB   |   15744KB   |  On  |  On  |  On  | On  | On  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                MISCELLANEOUS TECHNICAL NOTE                |
   |------------------------------------------------------------|
   | The location of pin 1 is unidentified.                     |
   +------------------------------------------------------------+