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

   486-25C/33C

   Processor             80486DX                                  
   Processor Speed       25/33MHz                                 
   Chip Set              None                                     
   Max. Onboard DRAM     32MB                                     
   Cache                 128KB                                    
   BIOS                  Phoenix                                  
   Dimensions            355mm x 304mm                            
   I/O Options           None                                     
   NPU Options           4167                                     

<gopher://bitreich.org/I/th99/m/A-B/30756-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | External battery |    X4    | Status display    |   X15    |
   |------------------+----------+-------------------+----------|
   | Turbo switch     |   X12    | Reset switch      |   X16    |
   |------------------+----------+-------------------+----------|
   | Speaker          |   X13    | Power LED &       |   X17    |
   |                  |          | keylock           |          |
   |------------------+----------+-------------------+----------|
   | Turbo LED        |   X14    |                   |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |           Function            | Jumper/Switch |  Position  |
   |-------------------------------+---------------+------------|
   |>> | Factory configured - do   |      S1       | pins 1 & 2 |
   |   | not alter                 |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | Battery installed < 5VDC  |      S2       | pins 1 & 2 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | Battery installed > 5VDC  |      S2       | pins 2 & 3 |
   |   |                           |               |   closed   |
   |---+---------------------------+---------------+------------|
   |>> | CPU speed select          |      S3       | pins 2 & 3 |
   |   | switchable at keyboard    |               |   closed   |
   |---+---------------------------+---------------+------------|
   |   | CPU speed select          |      S3       | pins 1 & 2 |
   |   | switchable at turbo       |               |   closed   |
   |   | switch                    |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |     SW1/1     |    N/A     |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | NPU disabled              |     SW1/2     |    Off     |
   |---+---------------------------+---------------+------------|
   |   | NPU enabled               |     SW1/2     |     On     |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |     SW1/3     |    N/A     |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Monitor type select       |     SW1/4     |    Off     |
   |   | monochrome                |               |            |
   |---+---------------------------+---------------+------------|
   |   | Monitor type select color |     SW1/4     |     On     |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      TP1      |    Off     |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      TP2      |    Off     |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      TP3      |    Off     |
   |   | not alter                 |               |            |
   |---+---------------------------+---------------+------------|
   |>> | Factory configured - do   |      TP4      |    Off     |
   |   | not alter                 |               |            |
   |------------------------------------------------------------|
   | Note: The location of S1 is unidentified.                  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |   Size   |   Bank 0    |  Bank 1   |  Bank 2   |  Bank 3   |
   |----------+-------------+-----------+-----------+-----------|
   |  4MB 2   | (4) 1M x 9  |   NONE    |   NONE    |   NONE    |
   |----------+-------------+-----------+-----------+-----------|
   |  8MB 2   | (4) 1M x 9  | (4) 1M x  |   NONE    |   NONE    |
   |          |             |     9     |           |           |
   |----------+-------------+-----------+-----------+-----------|
   |  12MB 2  | (4) 1M x 9  | (4) 1M x  | (4) 1M x  |   NONE    |
   |          |             |     9     |     9     |           |
   |----------+-------------+-----------+-----------+-----------|
   |  16MB 1  | (4) 1M x 9  | (4) 1M x  | (4) 1M x  | (4) 1M x  |
   |          |             |     9     |     9     |     9     |
   |----------+-------------+-----------+-----------+-----------|
   |  16MB 2  | (4) 1M x 9  | (4) 1M x  | (4) 1M x  | (4) 1M x  |
   |          |             |     9     |     9     |     9     |
   |----------+-------------+-----------+-----------+-----------|
   |  16MB 1  | (4) 4M x 9  |   NONE    |   NONE    |   NONE    |
   |----------+-------------+-----------+-----------+-----------|
   |  16MB 2  | (4) 4M x 9  |   NONE    |   NONE    |   NONE    |
   |----------+-------------+-----------+-----------+-----------|
   |  20MB 2  | (4) 4M x 9  | (4) 1M x  |   NONE    |   NONE    |
   |          |             |     9     |           |           |
   |----------+-------------+-----------+-----------+-----------|
   |  24MB 2  | (4) 4M x 9  | (4) 1M x  | (4) 1M x  |   NONE    |
   |          |             |     9     |     9     |           |
   |----------+-------------+-----------+-----------+-----------|
   |  28MB 2  | (4) 4M x 9  | (4) 1M x  | (4) 1M x  | (4) 1M x  |
   |          |             |     9     |     9     |     9     |
   |----------+-------------+-----------+-----------+-----------|
   |  32MB 1  | (4) 4M x 9  | (4) 4M x  |   NONE    |   NONE    |
   |          |             |     9     |           |           |
   |------------------------------------------------------------|
   | Note 1: These memory configurations do not utilize 256KB   |
   | remapping.                                                 |
   |                                                            |
   | Note 2: These memory configurations utilize 256KB memory   |
   | remapping.                                                 |
   |                                                            |
   | Due to remapping, system memory count on boot-up will      |
   | reflect 256KB less than actual.                            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM SWITCH CONFIGURATION                  |
   |------------------------------------------------------------|
   |     Size     |   SW1/5   |  SW1/6   |  SW1/ 7   |  SW1/8   |
   |--------------+-----------+----------+-----------+----------|
   |    4MB 2     |    On     |    On    |    On     |    On    |
   |--------------+-----------+----------+-----------+----------|
   |    8MB 2     |    On     |    On    |    On     |   Off    |
   |--------------+-----------+----------+-----------+----------|
   |    12MB 2    |    On     |    On    |    Off    |    On    |
   |--------------+-----------+----------+-----------+----------|
   |    16MB 1    |    On     |    On    |    Off    |   Off    |
   |--------------+-----------+----------+-----------+----------|
   |    16MB 2    |    On     |   Off    |    On     |   Off    |
   |--------------+-----------+----------+-----------+----------|
   |    16MB 1    |    On     |   Off    |    Off    |    On    |
   |--------------+-----------+----------+-----------+----------|
   |    16MB 2    |    On     |   Off    |    Off    |   Off    |
   |--------------+-----------+----------+-----------+----------|
   |    20MB 2    |    Off    |    On    |    On     |    On    |
   |--------------+-----------+----------+-----------+----------|
   |    24MB 2    |    Off    |    On    |    Off    |    On    |
   |--------------+-----------+----------+-----------+----------|
   |    28MB 2    |    Off    |    On    |    Off    |   Off    |
   |--------------+-----------+----------+-----------+----------|
   |    32MB 1    |    Off    |   Off    |    On     |    On    |
   |------------------------------------------------------------|
   | Note 1: These memory configurations do not utilize 256KB   |
   | remapping.                                                 |
   |                                                            |
   | Note 2: These memory configurations utilize 256KB-memory   |
   | remapping.                                                 |
   |                                                            |
   | Due to remapping, system memory count on boot-up will      |
   | reflect 256KB less than actual.                            |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |        TAG         |
   |------------------+--------------------+--------------------|
   |      128KB       |    (16) 8K x 8     |     (2) 8K x 8     |
   +------------------------------------------------------------+