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

   MINI 486 SYSTEM BOARD

   Processor         80486SX/80486DX/ODP486SX/80486DX2            
   Processor Speed   25/33/50(internal)/50/66(internal)MHz        
   Chip Set          Micronics                                    
   Max. Onboard DRAM 64MB                                         
   Cache             64/128/256KB                                 
   BIOS              Phoenix                                      
   Dimensions        230mm x 218mm                                
   I/O Options       None                                         
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/M-O/31746-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose              | Location | Purpose       | Location |
   |----------------------+----------+---------------+----------|
   | External keyboard    |    J1    | Turbo switch  |   W16    |
   | connector            |          |               |          |
   |----------------------+----------+---------------+----------|
   | Speaker              |   J20    | Turbo LED     |   W17    |
   |----------------------+----------+---------------+----------|
   | Reset switch         |   W15    | Power LED &   |   W18    |
   |                      |          | keylock       |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Monitor type select color        |   W2   |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select monochrome   |   W2   |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | Real Time Clock enabled          |   W3   | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | External battery enabled         |   W3   | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  W43   | pins 1 & 2 |
   |   | alter                            |        |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 1MB  | (1) 256K x  |    NONE     |    NONE    |    NONE    |
   |      |     36      |             |            |            |
   |------+-------------+-------------+------------+------------|
   | 2MB  | (1) 256K x  | (1) 256K x  |    NONE    |    NONE    |
   |      |     36      |     36      |            |            |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (1) 1M x 36 |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 6MB  | (1) 256K x  | (1) 256K x  |  (1) 1M x  |    NONE    |
   |      |     36      |     36      |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (1) 1M x 36 | (1) 1M x 36 |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 10MB | (1) 256K x  | (1) 256K x  |  (1) 1M x  |  (1) 1M x  |
   |      |     36      |     36      |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 12MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 1M x  |  (1) 1M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 16MB | (1) 4M x 36 |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 18MB | (1) 256K x  | (1) 256K x  |  (1) 4M x  |    NONE    |
   |      |     36      |     36      |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 20MB | (1) 1M x 36 | (1) 4M x 36 |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 24MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 4M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 32MB | (1) 4M x 36 | (1) 4M x 36 |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 36MB | (1) 1M x 36 | (1) 4M x 36 |  (1) 4M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 40MB | (1) 1M x 36 | (1) 1M x 36 |  (1) 4M x  |  (1) 4M x  |
   |      |             |             |     36     |     36     |
   |------+-------------+-------------+------------+------------|
   | 48MB | (1) 4M x 36 | (1) 4M x 9  |  (1) 4M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 64MB | (1) 4M x 36 | (1) 4M x 9  |  (1) 4M x  |  (1) 4M x  |
   |      |             |             |     36     |     36     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |  Size  |   Bank 0    |   Bank 1    |   TAG/U41   | TAG/U42 |
   |--------+-------------+-------------+-------------+---------|
   |  64KB  | (4) 8K x 8  | (4) 8K x 8  | (1) 8K x 8  |   N/A   |
   |--------+-------------+-------------+-------------+---------|
   | 128KB  | (4) 32K x 8 |    NONE     | (1) 32K x 8 |   N/A   |
   |--------+-------------+-------------+-------------+---------|
   | 256KB  | (4) 32K x 8 | (4) 32K x 8 | (1) 32K x 8 |   N/A   |
   |------------------------------------------------------------|
   | Note:Tag/U42 is not currently in use.                      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  | W5  | W6  | W7  | W8  | W9 | W10 | W11 | W12 | W13 |
   |-------+-----+-----+-----+-----+----+-----+-----+-----+-----|
   | 64KB  | 2 & | 1 & | 1 & | 2 & | 1  | 1 & | 1 & | 2 & | 2 & |
   |       |  3  |  2  |  2  |  3  | &  |  2  |  2  |  3  |  3  |
   |       |     |     |     |     | 2  |     |     |     |     |
   |-------+-----+-----+-----+-----+----+-----+-----+-----+-----|
   | 128KB | 2 & | 2 & | 1 & | 2 & | 2  | 1 & | 2 & | 1 & | 1 & |
   |       |  3  |  3  |  2  |  3  | &  |  2  |  3  |  2  |  2  |
   |       |     |     |     |     | 3  |     |     |     |     |
   |-------+-----+-----+-----+-----+----+-----+-----+-----+-----|
   | 256KB | 2 & | 2 & | 2 & | 2 & | 2  | 2 & | 2 & | 2 & | 2 & |
   |       |  3  |  3  |  3  |  3  | &  |  3  |  3  |  3  |  3  |
   |       |     |     |     |     | 3  |     |     |     |     |
   |------------------------------------------------------------|
   | Note:Pins designated should be in the closed position.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |       Type       |        W14         |        W19         |
   |------------------+--------------------+--------------------|
   |     80486SX      |        N/A         | pins 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |     80486DX      | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |     ODP486SX     | pins 1 & 2 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |     80486DX2     | pins 2 & 3 closed  | pins 2 & 3 closed  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |      Speed       |        W21         |        W22         |
   |------------------+--------------------+--------------------|
   |      25MHz       | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |      33MHz       | pins 1 & 2 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |     50i MHz      | pins 2 & 3 closed  | pins 2 & 3 closed  |
   |------------------+--------------------+--------------------|
   |      50MHz       | pins 1 & 2 closed  | pins 1 & 2 closed  |
   |------------------+--------------------+--------------------|
   |     66i MHz      | pins 1 & 2 closed  | pins 2 & 3 closed  |
   +------------------------------------------------------------+