UNIDENTIFIED
============

   MS-4109

   Processor         80486SX/80487SX/80486DX                      
   Processor Speed   16/20/25/33/50MHz                            
   Chip Set          Contaq                                       
   Max. Onboard DRAM 32MB                                         
   Cache             64/256KB                                     
   BIOS              AMI                                          
   Dimensions        330mm x 218mm                                
   I/O Options       None                                         
   NPU Options       4167                                         

<gopher://bitreich.org/I/th99/m/U-Z/32527-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose       | Location | Purpose              | Location |
   |---------------+----------+----------------------+----------|
   | Power LED &   | J3 pins  | Reset switch         | J3 pins  |
   | keylock       |  1 - 5   |                      | 19 - 20  |
   |---------------+----------+----------------------+----------|
   | Speaker       | J3 pins  | Auxiliary keyboard   |    J4    |
   |               |  7 - 10  | connector            |          |
   |---------------+----------+----------------------+----------|
   | Turbo LED     | J3 pins  | External battery     |   JP2    |
   |               | 12 - 13  |                      |          |
   |---------------+----------+----------------------+----------|
   | Turbo switch  | J3 pins  |                      |          |
   |               | 15 - 17  |                      |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Jumper |   Position   |
   |------------------------------------+--------+--------------|
   |>> | Monitor type select monochrome |  JP1   |     Open     |
   |---+--------------------------------+--------+--------------|
   |   | Monitor type select CGA        |  JP1   |    Closed    |
   |---+--------------------------------+--------+--------------|
   |>> | Battery type select internal   |  JP2   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | Battery type select external   |  JP2   |  pins 1 & 4  |
   |   |                                |        |    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        |
   |------------------+--------------------+--------------------|
   |       5MB        |     (4) 1M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        NONE        |
   |------------------+--------------------+--------------------|
   |       17MB       |     (4) 4M x 9     |    (4) 256K x 9    |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 4M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

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

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   |     Size      |                    JP8                     |
   |---------------+--------------------------------------------|
   |     64KB      | pins 1 & 5, 3 & 7, 9 & 13, 11 & 15 closed  |
   |---------------+--------------------------------------------|
   |     256KB     | pins 2 & 6, 4 & 8, 10 & 14, 12 & 16 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |     Type      |                    JP7                     |
   |---------------+--------------------------------------------|
   |    80486SX    | pins 2 & 6, 4 & 8, 10 & 14, 12 & 16 closed |
   |---------------+--------------------------------------------|
   |    80487SX    | pins 1 & 2, 3 & 4, 9 & 10, 11 & 12 closed  |
   |---------------+--------------------------------------------|
   |    80486DX    | pins 1 & 2, 3 & 4, 13 & 14, 15 & 16 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |           Speed            |              JP9              |
   |----------------------------+-------------------------------|
   |           16MHz            |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |           20MHz            |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |           25MHz            |       pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |           33MHz            |       pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |           50MHz            |       pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               CPU CLOCK SPEED CONFIGURATION                |
   |------------------------------------------------------------|
   |        Speed         |        JP3        |  JP5   |  JP6   |
   |----------------------+-------------------+--------+--------|
   | 16MHz (asynchronous) | pins 2 & 3 closed |  Open  |  Open  |
   |----------------------+-------------------+--------+--------|
   | 20MHz (synchronous)  | pins 1 & 2 closed |  Open  |  Open  |
   |----------------------+-------------------+--------+--------|
   | 25MHz (synchronous)  | pins 1 & 2 closed | Closed |  Open  |
   |----------------------+-------------------+--------+--------|
   | 33MHz (synchronous)  | pins 1 & 2 closed |  Open  | Closed |
   |----------------------+-------------------+--------+--------|
   | 50MHz (synchronous)  | pins 1 & 2 closed | Closed | Closed |
   +------------------------------------------------------------+