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

   LX400/P VESA LOCAL BUS

   Processor          80486SX/80487SX/80486DX/ODP486SX/80486DX2   
   Processor Speed    20/25/33/40/50(internal)/50/66(internal)MHz 
   Chip Set           SIS                                         
   Max. Onboard DRAM  32MB                                        
   SRAM Cache         64/128/256KB                                
   BIOS               AMI                                         
   Dimensions         254mm x 218mm                               
   I/O Options        32-bit VESA card slot (2)                   
   NPU Options        None                                        

<gopher://bitreich.org/I/th99/m/U-Z/31287-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose       | Location | Purpose              | Location |
   |---------------+----------+----------------------+----------|
   | Turbo LED     |    J3    | Reset switch         |    J6    |
   |---------------+----------+----------------------+----------|
   | Turbo switch  |    J4    | Power LED & keylock  |    J7    |
   |---------------+----------+----------------------+----------|
   | Speaker       |    J5    | 32-bit VESA card (2) | S1 & S2  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |               Function               | Jumper |  Position  |
   |--------------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP1   |   closed   |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Monitor type select color        |  JP2   |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Monitor type select monochrome   |  JP2   |    open    |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP9   |  unknown   |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Power good signal detect from    |  JP14  | pins 1 & 2 |
   |   | power supply                     |        |   closed   |
   |---+----------------------------------+--------+------------|
   |   | Power good signal detect from    |  JP14  | pins 2 & 3 |
   |   | board                            |        |   closed   |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP15  |  unknown   |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP16  |  unknown   |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP24  |  unknown   |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | Factory configured - do not      |  JP25  |  unknown   |
   |   | alter                            |        |            |
   |---+----------------------------------+--------+------------|
   |>> | VESA bus wait states select 0    |  JP26  |    open    |
   |---+----------------------------------+--------+------------|
   |   | VESA bus wait state select 1     |  JP26  |    open    |
   |---+----------------------------------+--------+------------|
   |>> | CPU speed select GBP 33MHz         |  JP27  |   closed   |
   |---+----------------------------------+--------+------------|
   |   | CPU speed select > 33MHz         |  JP27  |   closed   |
   |------------------------------------------------------------|
   | Note: The locations of JP1 and JP16 are unknown.           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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) 4M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       32MB       |     (4) 4M x 9     |     (4) 4M x 9     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Speed    |     JP10     |   JP11   |   JP12   |   JP13   |
   |------------+--------------+----------+----------+----------|
   |   66MHz    |  pins 1 & 2  | pins 2 & | pins 1 & | pins 1 & |
   | (internal) |    closed    | 3 closed | 2 closed | 2 closed |
   |------------+--------------+----------+----------+----------|
   |   50MHz    |  pins 1 & 2  | pins 1 & | pins 1 & | pins 1 & |
   |            |    closed    | 2 closed | 2 closed | 2 closed |
   |------------+--------------+----------+----------+----------|
   |   50MHz    |  pins 2 & 3  | pins 2 & | pins 1 & | pins 1 & |
   | (internal) |    closed    | 3 closed | 2 closed | 2 closed |
   |------------+--------------+----------+----------+----------|
   |   33MHz    |  pins 1 & 2  | pins 2 & | pins 1 & | pins 1 & |
   |            |    closed    | 3 closed | 2 closed | 2 closed |
   |------------+--------------+----------+----------+----------|
   |   25MHz    |  pins 2 & 3  | pins 2 & | pins 1 & | pins 1 & |
   |            |    closed    | 3 closed | 2 closed | 2 closed |
   |------------+--------------+----------+----------+----------|
   |   20MHz    |  pins 2 & 3  | pins 2 & | pins 2 & | pins 2 & |
   |            |    closed    | 3 closed | 3 closed | 3 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   |   CPU    |   JP6   |        JP7        |        JP8        |
   |----------+---------+-------------------+-------------------|
   | 80486DX  | closed  | pins 1 & 2 closed | pins 1 & 2 closed |
   |----------+---------+-------------------+-------------------|
   | 80487SX  | closed  | pins 2 & 3 closed | pins 1 & 2 closed |
   |----------+---------+-------------------+-------------------|
   | 80486SX  |  open   |       open        | pins 2 & 3 closed |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 SRAM JUMPER CONFIGURATION                  |
   |------------------------------------------------------------|
   | Jumper |      64KB       |     128KB      |     256KB      |
   |--------+-----------------+----------------+----------------|
   |  SR1   |   pins 2 & 3    |   pins 1 & 2   |   pins 2 & 3   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   |  SR2   |   pins 2 & 3    |   pins 1 & 2   |   pins 2 & 3   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   |  SR3   |   pins 1 & 2    |   pins 2 & 3   |   pins 2 & 3   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   |  SR4   |   pins 2 & 3    |   pins 2 & 3   |   pins 2 & 3   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   |  SR5   |   pins 1 & 2    |   pins 2 & 3   |   pins 2 & 3   |
   |        |     closed      |     closed     |     closed     |
   |--------+-----------------+----------------+----------------|
   |  SR6   |   pins 1 & 2    |   pins 1 & 2   |   pins 2 & 3   |
   |        |     closed      |     closed     |     closed     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     SRAM CONFIGURATION                     |
   |------------------------------------------------------------|
   |    Size    |  Cache SRAM   |   Location    |      TAG      |
   |------------+---------------+---------------+---------------|
   |    64KB    |  (8) 8K x 8   |  Banks 0 & 1  |  (1) 8K x 8   |
   |------------+---------------+---------------+---------------|
   |   128KB    |  (4) 32K x 8  |    Bank 0     |  (1) 8K x 8   |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (8) 32K x 8  |  Banks 0 & 1  |  (1) 32K x 8  |
   +------------------------------------------------------------+