MICRONICS COMPUTERS, INC.
=========================

   486DX2/50 SYSTEM BOARD

   Processor         80486DX2                                     
   Processor Speed   50(internal)MHz                              
   Chip Set          Micronics                                    
   Max. Onboard DRAM 64MB (32MB on external memory board)         
   Cache             64/256KB                                     
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       32-bit external memory card                  
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/M-O/32131-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose            | Location | Purpose         | Location |
   |--------------------+----------+-----------------+----------|
   | External battery   |   J11    | Turbo LED       |    W5    |
   |--------------------+----------+-----------------+----------|
   | Speaker            |   J23    | Reset switch    |    W6    |
   |--------------------+----------+-----------------+----------|
   | Power LED &        |   J24    | Turbo switch    |    W7    |
   | keylock            |          |                 |          |
   |--------------------+----------+-----------------+----------|
   | External keyboard  |    W1    | 32-bit external |   SL1    |
   | connector          |          | memory card     |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function                | Switch  | Position |
   |---------------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  SW1/1  |    On    |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  SW1/2  |   Off    |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  SW1/3  |   Off    |
   |---+-----------------------------------+---------+----------|
   |>> | I/O delay enabled                 |  SW1/4  |   Off    |
   |---+-----------------------------------+---------+----------|
   |   | I/O delay disabled                |  SW1/4  |    On    |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  SW1/5  |   Off    |
   |---+-----------------------------------+---------+----------|
   |>> | Video BIOS cache enabled          |  SW1/6  |   Off    |
   |---+-----------------------------------+---------+----------|
   |   | Video BIOS cache disabled         |  SW1/6  |    On    |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  SW1/7  |   Off    |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  SW1/8  |   Off    |
   |---+-----------------------------------+---------+----------|
   |>> | Factory configured - do not alter |  SW2/6  |    On    |
   |---+-----------------------------------+---------+----------|
   |>> | Cache enabled                     |  SW2/7  |   Off    |
   |---+-----------------------------------+---------+----------|
   |   | Cache disabled                    |  SW2/7  |    On    |
   |---+-----------------------------------+---------+----------|
   |>> | Cache enabled                     |  SW2/8  |   Off    |
   |---+-----------------------------------+---------+----------|
   |   | Cache disabled                    |  SW2/8  |    On    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 1MB  | (4) 256K x  |    NONE     |    NONE    |    NONE    |
   |      |      9      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 2MB  | (4) 256K x  | (4) 256K x  |    NONE    |    NONE    |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 3MB  | (4) 256K x  | (4) 256K x  | (4) 256K x |    NONE    |
   |      |      9      |      9      |     9      |            |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (4) 256K x  | (4) 256K x  | (4) 256K x | (4) 256K x |
   |      |      9      |      9      |     9      |     9      |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (4) 1M x 9  |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 5MB  | (4) 256K x  | (4) 1M x 9  |    NONE    |    NONE    |
   |      |      9      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 6MB  | (4) 256K x  | (4) 256K x  | (4) 1M x 9 |    NONE    |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 7MB  | (4) 256K x  | (4) 256K x  | (4) 256K x | (4) 1M x 9 |
   |      |      9      |      9      |     9      |            |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (4) 1M x 9  | (4) 1M x 9  |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 9MB  | (4) 256K x  | (4) 1M x 9  | (4) 1M x 9 |    NONE    |
   |      |      9      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 10MB | (4) 256K x  | (4) 256K x  | (4) 1M x 9 | (4) 1M x 9 |
   |      |      9      |      9      |            |            |
   |------+-------------+-------------+------------+------------|
   | 12MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 13MB | (4) 256K x  | (4) 1M x 9  | (4) 1M x 9 | (4) 1M x 9 |
   |      |      9      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 16MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 | (4) 1M x 9 |
   |------+-------------+-------------+------------+------------|
   | 16MB | (4) 4M x 9  |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 20MB | (4) 1M x 9  | (4) 4M x 9  |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 24MB | (4) 1M x 9  | (4) 1M x 9  | (4) 4M x 9 |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 28MB | (4) 1M x 9  | (4) 1M x 9  | (4) 1M x 9 | (4) 4M x 9 |
   |------+-------------+-------------+------------+------------|
   | 32MB | (4) 4M x 9  | (4) 4M x 9  |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 36MB | (4) 1M x 9  | (4) 4M x 9  | (4) 4M x 9 |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 40MB | (4) 1M x 9  | (4) 1M x 9  | (4) 4M x 9 | (4) 4M x 9 |
   |------+-------------+-------------+------------+------------|
   | 48MB | (4) 4M x 9  | (4) 4M x 9  | (4) 4M x 9 |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 52MB | (4) 1M x 9  | (4) 4M x 9  | (4) 4M x 9 | (4) 4M x 9 |
   |------+-------------+-------------+------------+------------|
   | 64MB | (4) 4M x 9  | (4) 4M x 9  | (4) 4M x 9 | (4) 4M x 9 |
   |------------------------------------------------------------|
   | Note: Banks 2 & 3 are located on the external memory card. |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 DRAM SWITCH CONFIGURATION                  |
   |------------------------------------------------------------|
   |  Size   |  SW2/1   |  SW2/2  |  SW2/3  |  SW2/4  |  SW2/5  |
   |---------+----------+---------+---------+---------+---------|
   |   1MB   |    On    |   On    |   On    |   On    |   On    |
   |---------+----------+---------+---------+---------+---------|
   |   2MB   |   Off    |   On    |   On    |   On    |   On    |
   |---------+----------+---------+---------+---------+---------|
   |   3MB   |    On    |   Off   |   On    |   On    |   On    |
   |---------+----------+---------+---------+---------+---------|
   |   4MB   |   Off    |   Off   |   On    |   On    |   On    |
   |---------+----------+---------+---------+---------+---------|
   |   4MB   |    On    |   On    |   Off   |   On    |   On    |
   |---------+----------+---------+---------+---------+---------|
   |   5MB   |    On    |   On    |   Off   |   Off   |   On    |
   |---------+----------+---------+---------+---------+---------|
   |   6MB   |    On    |   Off   |   On    |   Off   |   On    |
   |---------+----------+---------+---------+---------+---------|
   |   7MB   |   Off    |   On    |   On    |   Off   |   On    |
   |---------+----------+---------+---------+---------+---------|
   |   8MB   |   Off    |   On    |   Off   |   On    |   On    |
   |---------+----------+---------+---------+---------+---------|
   |   9MB   |    On    |   Off   |   Off   |   Off   |   On    |
   |---------+----------+---------+---------+---------+---------|
   |  10MB   |   Off    |   Off   |   On    |   Off   |   On    |
   |---------+----------+---------+---------+---------+---------|
   |  12MB   |    On    |   Off   |   Off   |   On    |   Off   |
   |---------+----------+---------+---------+---------+---------|
   |  13MB   |   Off    |   Off   |   Off   |   Off   |   On    |
   |---------+----------+---------+---------+---------+---------|
   |  16MB   |   Off    |   Off   |   Off   |   On    |   On    |
   |---------+----------+---------+---------+---------+---------|
   |  16MB   |    On    |   On    |   Off   |   On    |   Off   |
   |---------+----------+---------+---------+---------+---------|
   |  20MB   |    On    |   On    |   Off   |   Off   |   Off   |
   |---------+----------+---------+---------+---------+---------|
   |  24MB   |    On    |   Off   |   On    |   Off   |   Off   |
   |---------+----------+---------+---------+---------+---------|
   |  28MB   |   Off    |   On    |   On    |   Off   |   Off   |
   |---------+----------+---------+---------+---------+---------|
   |  32MB   |   Off    |   On    |   Off   |   On    |   Off   |
   |---------+----------+---------+---------+---------+---------|
   |  36MB   |    On    |   Off   |   Off   |   Off   |   Off   |
   |---------+----------+---------+---------+---------+---------|
   |  40MB   |   Off    |   Off   |   On    |   Off   |   Off   |
   |---------+----------+---------+---------+---------+---------|
   |  48MB   |    On    |   Off   |   Off   |   On    |   Off   |
   |---------+----------+---------+---------+---------+---------|
   |  52MB   |   Off    |   Off   |   Off   |   Off   |   Off   |
   |---------+----------+---------+---------+---------+---------|
   |  64MB   |   Off    |   Off   |   Off   |   On    |   Off   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       64KB       |     (4) 8K x 8     |     (4) 8K x 8     |
   |------------------+--------------------+--------------------|
   |      256KB       |    (4) 32K x 8     |    (4) 32K x 8     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |    Size    |     W3      |     W4      |        W15        |
   |------------+-------------+-------------+-------------------|
   |    64KB    |    Open     |    Open     | pins 2 & 3 closed |
   |------------+-------------+-------------+-------------------|
   |   256KB    |   Closed    |   Closed    | pins 1 & 2 closed |
   +------------------------------------------------------------+