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

   EISA-3 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             64/128/256/512KB                             
   BIOS              Phoenix                                      
   Dimensions        330mm x 218mm                                
   I/O Options       None                                         
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/M-O/31745-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | External battery |    J3    | Power LED &       |   J11    |
   |                  |          | keylock           |          |
   |------------------+----------+-------------------+----------|
   | Turbo LED        |    J5    | Speaker           |   J13    |
   |------------------+----------+-------------------+----------|
   | Turbo switch     |    J8    | External keyboard |   J23    |
   |                  |          | connector         |          |
   |------------------+----------+-------------------+----------|
   | Reset switch     |    J9    |                   |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |   |              Function              | Jumper | Position |
   |---+------------------------------------+--------+----------|
   |>> | Monitor type select color          |  J12   |  Closed  |
   |---+------------------------------------+--------+----------|
   |   | Monitor type select monochrome     |  J12   |   Open   |
   |---+------------------------------------+--------+----------|
   |>> | Factory configured - do not alter  |  J25   |   Open   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size |   Bank 0    |   Bank 1    |   Bank 2   |   Bank 3   |
   |------+-------------+-------------+------------+------------|
   | 4MB  | (1) 1M x 36 |    NONE     |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 8MB  | (1) 1M x 36 | (1) 1M x 36 |    NONE    |    NONE    |
   |------+-------------+-------------+------------+------------|
   | 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    |
   |------+-------------+-------------+------------+------------|
   | 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 36 |  (1) 4M x  |    NONE    |
   |      |             |             |     36     |            |
   |------+-------------+-------------+------------+------------|
   | 64MB | (1) 4M x 36 | (1) 4M x 36 |  (1) 4M x  |  (1) 4M x  |
   |      |             |             |     36     |     36     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |Size | Bank 0 |Bank 1 |TAG/U101|TAG/U102|TAG/U103 |TAG/U104 |
   |-----+--------+-------+--------+--------+---------+---------|
   |64KB |(4) 8K x|(4) 8K |  NONE  |  NONE  |(1) 64K x|(1) 32K x|
   |     |   8    |  x 8  |        |        |    1    |    8    |
   |-----+--------+-------+--------+--------+---------+---------|
   |128KB|(4) 32K | NONE  |  NONE  |  NONE  |(1) 64K x|(1) 32K x|
   |     |  x 8   |       |        |        |    1    |    8    |
   |-----+--------+-------+--------+--------+---------+---------|
   |256KB|(4) 32K |(4) 32K|(1) 16K |(1) 16K |(1) 64K x|  NONE   |
   |     |  x 8   |  x 8  |  x 4   |  x 4   |    1    |         |
   |-----+--------+-------+--------+--------+---------+---------|
   |512KB|(4) 128K| NONE  |  NONE  |  NONE  |(1) 64K x|(1) 32K x|
   |     |  x 8   |       |        |        |    1    |    8    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  | J15  | J16  | J17  | J18  | J19  | J20 | J21 | J22 |
   |-------+------+------+------+------+------+-----+-----+-----|
   | 64KB  | 1 &  | 1 &  | 1 &  | 1 &  | 1 &  | 1 & | 2 & | 3 & |
   |       |  2   |  2   |  2   |  2   |  2   |  2  |  3  |  4  |
   |-------+------+------+------+------+------+-----+-----+-----|
   | 128KB | 2 &  | 1 &  | 1 &  | 2 &  | 1 &  | 1 & | 1 & | 4 & |
   |       |  3   |  2   |  2   |  3   |  2   |  2  |  2  |  5  |
   |-------+------+------+------+------+------+-----+-----+-----|
   | 256KB | 2 &  | 2 &  | 1 &  | 1 &  | 1 &  | 1 & | 1 & | 1 & |
   |       |  3   |  3   |  2   |  2   |  2   |  2  |  2  |  2  |
   |-------+------+------+------+------+------+-----+-----+-----|
   | 512KB | 2 &  | 2 &  | 2 &  | 2 &  | 2 &  | 2 & | 1 & | 4 & |
   |       |  3   |  3   |  3   |  3   |  3   |  3  |  2  |  5  |
   |------------------------------------------------------------|
   | Note:Pins designated should be in the closed position.     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |       Speed        |        J7         |        J10        |
   |--------------------+-------------------+-------------------|
   |       25MHz        |      Closed       |      Closed       |
   |--------------------+-------------------+-------------------|
   |       33MHz        |       Open        |      Closed       |
   |--------------------+-------------------+-------------------|
   |      50i MHz       |      Closed       |      Closed       |
   |--------------------+-------------------+-------------------|
   |       50MHz        |       Open        |       Open        |
   |--------------------+-------------------+-------------------|
   |      66i MHz       |       Open        |      Closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   U1    |    U2    |    JP1     |    JP2     |     JP3     |
   |---------+----------+------------+------------+-------------|
   | 80486SX |   NONE   | pins 1 & 2 | pins 3 & 4 | pins 2 & 3  |
   |         |          |   closed   |   closed   |   closed    |
   |---------+----------+------------+------------+-------------|
   |  NONE   | 80486SX  | pins 1 & 2 | pins 3 & 4 | pins 2 & 3  |
   |         |          |   closed   |   closed   |   closed    |
   |---------+----------+------------+------------+-------------|
   |  NONE   | 80486DX  | pins 2 & 3 | pins 1 & 2 | pins 1 & 2  |
   |         |          |   closed   |   closed   |  and 3 & 4  |
   |         |          |            |            |   closed    |
   |---------+----------+------------+------------+-------------|
   |  NONE   | 80486DX2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2  |
   |         |          |   closed   |   closed   |  and 3 & 4  |
   |         |          |            |            |   closed    |
   |---------+----------+------------+------------+-------------|
   | 80486SX | 80487SX  | pins 1 & 2 | pins 1 & 2 | pins 1 & 2  |
   |         |          |   closed   |   closed   |  and 3 & 4  |
   |         |          |            |            |   closed    |
   |---------+----------+------------+------------+-------------|
   | 80486SX | 80486DX  | pins 2 & 3 | pins 1 & 2 | pins 1 & 2  |
   |         |          |   closed   |   closed   |  and 3 & 4  |
   |         |          |            |            |   closed    |
   |---------+----------+------------+------------+-------------|
   | 80486SX | 80486DX2 | pins 2 & 3 | pins 1 & 2 | pins 1 & 2  |
   |         |          |   closed   |   closed   |  and 3 & 4  |
   |         |          |            |            |   closed    |
   |---------+----------+------------+------------+-------------|
   | 80486SX | ODP486SX | pins 1 & 2 | pins 2 & 3 | pins 1 & 2  |
   |         |          |   closed   |   closed   |  and 3 & 4  |
   |         |          |            |            |   closed    |
   +------------------------------------------------------------+