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

   LX400A/G

   Processor      80486SX/80487SX/80486DX/80486DX2                
   Processor      25/33/40/50(internal)/50/66(internal) MHz       
   Speed          
   Chip Set       SiS                                             
   Max. Onboard   32MB                                            
   DRAM           
   Cache          64/128/256                                      
   BIOS           AMI                                             
   Dimensions     230mm x 218mm                                   
   I/O Options    32-bit VESA local bus slots (2), PS/2 mouse     
                  port                                            
   NPU Options    None                                            

<gopher://bitreich.org/I/th99/m/U-Z/31947-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose       | Location | Purpose              | Location |
   |---------------+----------+----------------------+----------|
   | Flash LED     |  FLASH   | Power LED & keylock  |    J7    |
   | connector     |          |                      |          |
   |---------------+----------+----------------------+----------|
   | Turbo LED     |    J3    | PS/2 mouse connector |   J11    |
   |---------------+----------+----------------------+----------|
   | Turbo switch  |    J4    | Standby output       |   J28    |
   |               |          | connector            |          |
   |---------------+----------+----------------------+----------|
   | Speaker       |    J5    | 32-bit VESA Local    |    S1    |
   |               |          | bus slot             |          |
   |---------------+----------+----------------------+----------|
   | Reset switch  |    J6    | 32-bit VESA Local    |    S2    |
   |               |          | bus slot             |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function               | Jumper |  Position   |
   |-------------------------------------+--------+-------------|
   |>> | Factory configured do not alter |  JP1   |    Open     |
   |---+---------------------------------+--------+-------------|
   |>> | Monitor type select color       |  JP2   |   Closed    |
   |---+---------------------------------+--------+-------------|
   |   | Monitor type select monochrome  |  JP2   |    Open     |
   |---+---------------------------------+--------+-------------|
   |>> | Factory configured do not alter |  JP10  |     N/A     |
   |---+---------------------------------+--------+-------------|
   |>> | Factory configured do not alter |  JP11  |     N/A     |
   |---+---------------------------------+--------+-------------|
   |   | PS/2 mouse interrupt            |  JP12  | pins 1 & 2  |
   |   |                                 |        |   closed    |
   |---+---------------------------------+--------+-------------|
   |   | PS/2 mouse set at AT Bus IRQ12  |  JP12  | pins 2 & 3  |
   |   |                                 |        |   closed    |
   |---+---------------------------------+--------+-------------|
   |>> | Factory configured do not alter |  JP13  |     N/A     |
   |---+---------------------------------+--------+-------------|
   |>> | Factory configured do not alter |  JP14  |     N/A     |
   |---+---------------------------------+--------+-------------|
   |>> | Factory configured do not alter |  JP21  |     N/A     |
   |---+---------------------------------+--------+-------------|
   |>> | Factory configured do not alter |  JP22  |     N/A     |
   |---+---------------------------------+--------+-------------|
   |>> | Factory configured do not alter |  JP23  |     N/A     |
   |---+---------------------------------+--------+-------------|
   |>> | Power saving mode switch off    | STDBY  |    Open     |
   |---+---------------------------------+--------+-------------|
   |   | Power saving mode switch on     | STDBY  |   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) 4MB x 9     |    (4) 4MB x 9     |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1MB x9     |    (4) 4MB x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |    (4) 4MB x 9     |    (4) 4MB x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |    SR1     |   SR2    |   SR3    |  SR4   |  SR5   |
   |-------+------------+----------+----------+--------+--------|
   | 64KB  | pins 2 & 3 | pins 2 & | pins 1 & | pins 1 | pins 1 |
   |       |            |    3     |    2     |  & 2   |  & 2   |
   |-------+------------+----------+----------+--------+--------|
   | 128KB | pins 1 & 2 | pins 1 & | pins 2 & | pins 2 | pins 1 |
   |       |            |    2     |    3     |  & 3   |  & 2   |
   |-------+------------+----------+----------+--------+--------|
   | 256KB | pins 2 & 3 | pins 2 & | pins 2 & | pins 2 | pins 2 |
   |       |            |    3     |    3     |  & 3   |  & 3   |
   |------------------------------------------------------------|
   | Note:Pins designated are in the closed position.           |
   +------------------------------------------------------------+

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

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   | CPU Type  |  JP6   |        JP7        |        JP8        |
   |-----------+--------+-------------------+-------------------|
   |  80486SX  |  Open  |       Open        | pins 2 & 3 closed |
   |-----------+--------+-------------------+-------------------|
   |  80487SX  | Closed | pins 2 & 3 closed | pins 1 & 2 closed |
   |-----------+--------+-------------------+-------------------|
   |  80486DX  | Closed | pins 1 & 2 closed | pins 1 & 2 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |    CPU speed    |      S0      |     S1      |     S2      |
   |-----------------+--------------+-------------+-------------|
   |     25 MHz      |    Closed    |    Open     |    Open     |
   |-----------------+--------------+-------------+-------------|
   |     33 MHz      |    Closed    |   Closed    |   Closed    |
   |-----------------+--------------+-------------+-------------|
   |     40 MHz      |    Closed    |   Closed    |   Closed    |
   |-----------------+--------------+-------------+-------------|
   |     50 MHz      |     Open     |    Open     |   Closed    |
   |-----------------+--------------+-------------+-------------|
   |     50iMHz      |    Closed    |    Open     |    Open     |
   |-----------------+--------------+-------------+-------------|
   |     60iMHz      |    Closed    |   Closed    |   Closed    |
   |------------------------------------------------------------|
   | Note:The location on the system board of the above jumpers |
   | is unidentified.                                           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |          VESA WAIT STATE/BUS SPEED CONFIGURATION           |
   |------------------------------------------------------------|
   | CPU Speed |  Wait states  |    JP24, JP26    | JP25, JP27  |
   |-----------+---------------+------------------+-------------|
   |  < 33MHz  | 0 wait states |    pins 1 & 2    | pins 1 & 2  |
   |           |               |      closed      |   closed    |
   |-----------+---------------+------------------+-------------|
   |  > 33MHz  | 1 wait state  |    pins 2 & 3    | pins 2 & 3  |
   |           |               |      closed      |   closed    |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                MISCELLANEOUS TECHNICAL NOTE                |
   |------------------------------------------------------------|
   | Note:Some of the SR jumpers may be hard-wired by the       |
   | manufacturer, thus some of the cache options   may not be  |
   | available.                                                 |
   +------------------------------------------------------------+