NCR CORPORATION
===============

   PC916SX

   Processor             80386SX                                  
   Speed                 16MHz                                    
   Chip Set              Unidentified                             
   Max. Onboard DRAM     1MB                                      
   BIOS                  Unidentified                             
   Cache                 None                                     
   Dimensions            290mm x 106mm                            
   I/O Options           External memory card slot                
   NPU Options           80387SX                                  

<gopher://bitreich.org/I/th99/m/M-O/30455-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   |     Purpose     | Location |      Purpose      | Location  |
   |-----------------+----------+-------------------+-----------|
   | External        |    J2    | Keyboard          |    J5     |
   | Battery         |          | connector         |           |
   |-----------------+----------+-------------------+-----------|
   | Turbo LEDs &    |    J3    | Proprietary       | P11 & P12 |
   | keylock         |          | external memory   |           |
   |                 |          | port              |           |
   |-----------------+----------+-------------------+-----------|
   | Speaker &       |    J4    |                   |           |
   | volume control  |          |                   |           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                USER CONFIGURABLE SETTINGS                 ||
   |-----------------------------------------------------------||
   |           Function            | Jumper/Switch | Position  ||
   |-------------------------------+---------------+-----------||
   |>> | Pipeline mode disabled    | JP3-I/JP3-II  | pins 2 &  ||
   |   |                           |               | 3 closed  ||
   |---+---------------------------+---------------+-----------||
   |   | Pipeline mode enabled     | JP3-I/JP3-II  | pins 1 &  ||
   |   |                           |               | 2 closed  ||
   |---+---------------------------+---------------+-----------||
   |>> | Monitor type select color |      S1       | pins 1 &  ||
   |   |                           |               | 2 closed  ||
   |---+---------------------------+---------------+-----------||
   |   | Monitor type select       |      S1       | pins 2 &  ||
   |   | monochrome                |               | 3 closed  ||
   |---+---------------------------+---------------+-----------||
   |>> | Power-on speed select     |      S2       | pins 1 &  ||
   |   | fast                      |               | 2 closed  ||
   |---+---------------------------+---------------+-----------||
   |>> | Power-on speed select     |      S2       | pins 2 &  ||
   |   | slow                      |               | 3 closed  ||
   |---+---------------------------+---------------+-----------||
   |>> | DRAM speed select slow    |     SW3/1     |    Off    ||
   |---+---------------------------+---------------+-----------||
   |   | DRAM speed select fast    |     SW3/1     |    On     ||
   |---+---------------------------+---------------+-----------||
   |>> | DMA speed select          |     SW3/2     |    Off    ||
   |   | automatic                 |               |           ||
   |---+---------------------------+---------------+-----------||
   |   | DMA speed select 8MHz     |     SW3/2     |    On     ||
   |---+---------------------------+---------------+-----------||
   |>> | Memory 0-512KB enabled    |     SW3/3     |    Off    ||
   |---+---------------------------+---------------+-----------||
   |   | Memory 0-256KB enabled,   |     SW3/3     |    On     ||
   |   | 256-512KB disabled        |               |           ||
   |---+---------------------------+---------------+-----------||
   |>> | Memory 512-1024KB enabled |     SW3/4     |    Off    ||
   |---+---------------------------+---------------+-----------||
   |   | Memory 512-1024KB         |     SW34      |    On     ||
   |   | disabled                  |               |           ||
   |---+--------------------------------------------------------|
   |   | Notes:JP3-I is found on Type MMI mainboard, JP3-II is  |
   |   | found on Type MMII mainboard.                          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |            Size            |            Bank 0             |
   |----------------------------+-------------------------------|
   |            1MB             |           (8) 44256           |
   |------------------------------------------------------------|
   | Note:Memory chip sizes and locations are unidentified.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               DRAM - I/O SPEED CONFIGURATION               |
   |------------------------------------------------------------|
   |   IOW, MEMW,   |  IOR   |       JP1       |      JP2       |
   |      MEMR      |        |                 |                |
   |----------------+--------+-----------------+----------------|
   |>>   |  500ns   | 750ns  |   pins 2 & 3    |   pins 1 & 2   |
   |     |          |        |     closed      |     closed     |
   |-----+----------+--------+-----------------+----------------|
   |     |  250ns   | 500ns  |   pins 2 & 3    |   pins 2 & 3   |
   |     |          |        |     closed      |     closed     |
   |-----+----------+--------+-----------------+----------------|
   |     |  750ns   | 1000ns |   pins 1 & 2    |   pins 2 & 3   |
   |     |          |        |     closed      |     closed     |
   |-----+----------+--------+-----------------+----------------|
   |     |  1000ns  | 1250ns |   pins 1 & 2    |   pins 1 & 2   |
   |     |          |        |     closed      |     closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM MAPPING CONFIGURATION                 |
   |------------------------------------------------------------|
   | Extended |  Mapping area   | SW3/5 | SW3/6 | SW3/7 | SW3/8 |
   |  memory  |                 |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   0MB    |    100000 -     |  Off  |  On   |  On   |  On   |
   |          |     160000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   1MB    |    200000 -     |  On   |  Off  |  On   |  On   |
   |          |     260000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   2MB    |    300000 -     |  Off  |  Off  |  On   |  On   |
   |          |     360000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   3MB    |    400000 -     |  On   |  On   |  Off  |  On   |
   |          |     460000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   4MB    |    500000 -     |  Off  |  On   |  Off  |  On   |
   |          |     560000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   5MB    |    600000 -     |  On   |  Off  |  Off  |  On   |
   |          |     660000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   6MB    |    700000 -     |  Off  |  Off  |  Off  |  On   |
   |          |     760000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   7MB    |    800000 -     |  On   |  On   |  On   |  Off  |
   |          |     860000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   8MB    |    900000 -     |  Off  |  On   |  On   |  Off  |
   |          |     960000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   9MB    |    A00000 -     |  On   |  Off  |  On   |  Off  |
   |          |     A60000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   10MB   |    B00000 -     |  Off  |  Off  |  On   |  Off  |
   |          |     B60000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   11MB   |    C00000 -     |  On   |  On   |  Off  |  Off  |
   |          |     C60000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   12MB   | D00000 D60000h  |  Off  |  On   |  Off  |  Off  |
   |----------+-----------------+-------+-------+-------+-------|
   |   13MB   |    E00000 -     |  On   |  Off  |  Off  |  Off  |
   |          |     E60000h     |       |       |       |       |
   |----------+-----------------+-------+-------+-------+-------|
   |   14MB   |    F00000 -     |  Off  |  Off  |  Off  |  Off  |
   |          |     F60000h     |       |       |       |       |
   +------------------------------------------------------------+