MICROMEDIA TECHNOLOGIES, INC.
=============================

   486-S

   Processor         80486SX/80486DX/80486DX2                     
   Processor Speed   20/25/33/50(internal)MHz                     
   Chip Set          SIS                                          
   Max. Onboard DRAM 32MB                                         
   Cache             32/64/128/256KB                              
   BIOS              AMI                                          
   Dimensions        230mm x 218mm                                
   I/O Options       None                                         
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/M-O/31710-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   CN1    | Turbo LED        |   CN4    |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Speaker           |   CN2    | Reset switch     |   CN5    |
   |-------------------+----------+------------------+----------|
   | Turbo switch      |   CN3    | External battery |   CN6    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | CMOS memory normal operation     |  JP10  | pins 1 & 2 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | CMOS memory clear                |  JP10  | pins 2 & 3 |
   |   |                                  |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Monitor type select color        |  JP13  |   Closed   |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select monochrome   |  JP13  |    Open    |
   |---+----------------------------------+--------+------------|
   |>> | Power good signal detect from    |  JP17  | pins 1 & 2 |
   |   | board                            |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Power good signal detect from    |  JP17  | pins 2 & 3 |
   |   | power supply                     |        |   closed   |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     DRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |       Size       |       Bank 0       |       Bank 1       |
   |------------------+--------------------+--------------------|
   |       1MB        |    (4) 256K x 9    |        NONE        |
   |------------------+--------------------+--------------------|
   |       2MB        |    (4) 256K x 9    |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       4MB        |     (4) 1M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1M x 9     |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |    Bank 0     |    Bank 1     |      TAG      |
   |------------+---------------+---------------+---------------|
   |    32KB    |  (4) 8K x 8   |     NONE      |  (1) 8K x 8   |
   |------------+---------------+---------------+---------------|
   |    64KB    |  (4) 8K x 8   |  (4) 8K x 8   |  (1) 8K x 8   |
   |------------+---------------+---------------+---------------|
   |   128KB    |  (4) 32K x 8  |     NONE      |  (1) 32K x 8  |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 8  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |Size | JP1  | JP2 | JP3 | JP4 | JP5 | JP6 | JP7 | JP8 | JP9 |
   |-----+------+-----+-----+-----+-----+-----+-----+-----+-----|
   |32KB |1 & 2 |1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|1 & 2|
   |-----+------+-----+-----+-----+-----+-----+-----+-----+-----|
   |64KB |1 & 2 |1 & 2|2 & 3|2 & 3|1 & 2|1 & 2|1 & 2|2 & 3|2 & 3|
   |-----+------+-----+-----+-----+-----+-----+-----+-----+-----|
   |128KB|2 & 3 |1 & 2|2 & 3|2 & 3|2 & 3|1 & 2|2 & 3|1 & 2|1 & 2|
   |-----+------+-----+-----+-----+-----+-----+-----+-----+-----|
   |256KB|2 & 3 |2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|2 & 3|
   |------------------------------------------------------------|
   |Note:Pins designated should be in the closed position.      |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type   |  JP14   |       JP15        |       JP16        |
   |----------+---------+-------------------+-------------------|
   | 80486SX  |  Open   | pins 2 & 3 closed | pins 2 & 3 closed |
   |----------+---------+-------------------+-------------------|
   | 80487SX  | Closed  | pins 1 & 2 closed | pins 2 & 3 closed |
   |----------+---------+-------------------+-------------------|
   | 80486DX  | Closed  | pins 1 & 2 closed | pins 1 & 2 closed |
   +------------------------------------------------------------+