ARNOS INSTRUMENTS & COMPUTER SYSTEMS, INC.
==========================================

   386SX-16-20-25

   Processor             80386SX                                  
   Processor Speed       16/20/25MHz                              
   Chip Set              None                                     
   Max. Onboard DRAM     8MB                                      
   Cache                 None                                     
   BIOS                  Quadtel                                  
   Dimensions            330mm x 218mm                            
   I/O Options           None                                     
   NPU Options           80387SX                                  

<gopher://bitreich.org/I/th99/m/A-B/30754-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | External battery |    X6    | Power LED &       |   X14    |
   |                  |          | keylock           |          |
   |------------------+----------+-------------------+----------|
   | Turbo LED        |   X11    | Status display    |   X17    |
   |------------------+----------+-------------------+----------|
   | Reset switch     |   X12    | Speaker           |   X21    |
   |------------------+----------+-------------------+----------|
   | Turbo switch     |   X13    |                   |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |           Function            | Jumper/Switch |  Position  |
   |-------------------------------+---------------+------------|
   |>> | Battery installed < 5VDC  |      S1       | pins 1 & 2 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | Battery installed > 5VDC  |      S1       | pins 2 & 3 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | CPU speed select          |      S2       | pins 2 & 3 |
   |   | switchable at keyboard    |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | CPU speed select          |      S2       | pins 1 & 2 |
   |   | switchable at turbo       |               |   closed   |
   |   | switch                    |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |     SW1/1     |    N/A     |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | NPU enabled               |     SW1/2     |    Off     |
   |---+---------------------------+---------------+------------|
   |   | NPU disabled              |     SW1/2     |     On     |
   |---+---------------------------+---------------+------------|
   |>> | Normal CPU speed during   |     SW1/3     |    Off     |
   |   | floppy operations         |               |            |
   |---+---------------------------+---------------+------------|
   |   | Slow CPU speed to 8MHz    |     SW1/3     |     On     |
   |   | during floppy operations  |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Monitor type select       |     SW1/4     |    Off     |
   |   | monochrome                |               |            |
   |---+---------------------------+---------------+------------|
   |   | Monitor type select color |     SW1/4     |     On     |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |     SW1/5     |    N/A     |
   |   | not alter                 |               |            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 1MB  | (2) 256K x  | (2) 256K x  |    NONE    |    NONE    |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 2MB  | (2) 256K x  | (2) 256K x  | (2) 256K x | (2) 256K x |
   |      |      9      |      9      |     9      |     9      |
   |------+-------------+-------------+------------+------------|
   | 2MB  | (2) 1M x 9  |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (2) 1M x 9  | (2) 1M x 9  |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 6MB  | (2) 1M x 9  | (2) 1M x 9  | (2) 1M x 9 |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (2) 1M x 9  | (2) 1M x 9  | (2) 1M x 9 | (2) 1M x 9 |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM SWITCH CONFIGURATION                  |
   |------------------------------------------------------------|
   |   Size   | Banks used  |   SW1/6   |   SW1/7   |   SW1/8   |
   |----------+-------------+-----------+-----------+-----------|
   |   1MB    |    0 & 1    |    On     |    On     |    On     |
   |----------+-------------+-----------+-----------+-----------|
   |   2MB    | 0, 1, 2 & 3 |    On     |    Off    |    On     |
   |----------+-------------+-----------+-----------+-----------|
   |   2MB    |      0      |    On     |    Off    |    Off    |
   |----------+-------------+-----------+-----------+-----------|
   |   4MB    |    0 & 1    |    Off    |    On     |    On     |
   |----------+-------------+-----------+-----------+-----------|
   |   6MB    |  0, 1 & 2   |    Off    |    Off    |    On     |
   |----------+-------------+-----------+-----------+-----------|
   |   8MB    | 0, 1, 2 & 3 |    Off    |    Off    |    Off    |
   +------------------------------------------------------------+