ILON USA, INC.
==============

   M-423

   Processor         80486SX/80487SX/80486DX/80486DX2             
   Processor Speed   20/25/33/50(internal)MHz                     
   Chip Set          PC Chips                                     
   Max. Onboard DRAM 32MB                                         
   Cache             32/64/128/256KB                              
   BIOS              AMI                                          
   Dimensions        220mm x 220mm                                
   I/O Options       None                                         
   NPU Options       4167                                         

<gopher://bitreich.org/I/th99/m/I-L/32769-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose          | Location | Purpose           | Location |
   |------------------+----------+-------------------+----------|
   | External battery |   JP1    | Power LED &       |   JP20   |
   |                  |          | keylock           |          |
   |------------------+----------+-------------------+----------|
   | Reset switch     |   JP17   | Speaker           |   JP21   |
   |------------------+----------+-------------------+----------|
   | Turbo LED        |   JP18   | Weitek 4167       |    W1    |
   |                  |          | connector         |          |
   |------------------+----------+-------------------+----------|
   | Turbo switch     |   JP19   |                   |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Jumper |   Position   |
   |------------------------------------+--------+--------------|
   |>> | Monitor type select color      |  JP2   |    Closed    |
   |---+--------------------------------+--------+--------------|
   |   | Monitor type select monochrome |  JP2   |     Open     |
   |---+--------------------------------+--------+--------------|
   |>> | Gate type select fast A20      |  JP3   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | Gate type select keyboard A20  |  JP3   |  pins 2 & 3  |
   |   |                                |        |    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) 256K x 9    |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       8MB        |     (4) 1M x 9     |     (4) 1M x 9     |
   |------------------+--------------------+--------------------|
   |       16MB       |     (4) 4M x 9     |        None        |
   |------------------+--------------------+--------------------|
   |       20MB       |     (4) 1M x 9     |     (4) 4M 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      |
   |------------+---------------+---------------+---------------|
   |    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) 8K x 8   |
   |------------+---------------+---------------+---------------|
   |   256KB    |  (4) 32K x 8  |  (4) 32K x 8  |  (1) 32K x 8  |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |          CACHE JUMPER WRITE-THROUGH CONFIGURATION          |
   |------------------------------------------------------------|
   |   Size   |   JP4   |   JP6   |  JP11   |  JP12   |  JP13   |
   |----------+---------+---------+---------+---------+---------|
   |   32KB   |  2 & 3  |  2 & 3  |  2 & 3  |  2 & 3  |  2 & 3  |
   |----------+---------+---------+---------+---------+---------|
   |   64KB   |  1 & 2  |  2 & 3  |  1 & 2  |  1 & 2  |  2 & 3  |
   |----------+---------+---------+---------+---------+---------|
   |  128KB   |  1 & 2  |  1 & 2  |  1 & 2  |  1 & 2  |  1 & 2  |
   |----------+---------+---------+---------+---------+---------|
   |  256KB   |  2 & 3  |  1 & 2  |  1 & 2  |  1 & 2  |  1 & 2  |
   |------------------------------------------------------------|
   | Note: Pins designated should be in closed position.        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |           CACHE JUMPER WRITE-BACK CONFIGURATION            |
   |------------------------------------------------------------|
   |    Size    |    JP7     |    JP8    |    JP9    |   JP10   |
   |------------+------------+-----------+-----------+----------|
   |    32KB    |   1 & 2    |   2 & 3   |   2 & 3   |  2 & 3   |
   |------------+------------+-----------+-----------+----------|
   |    64KB    |   2 & 3    |   2 & 3   |   2 & 3   |  1 & 2   |
   |------------+------------+-----------+-----------+----------|
   |   128KB    |   2 & 3    |   2 & 3   |   1 & 2   |  2 & 3   |
   |------------+------------+-----------+-----------+----------|
   |   256KB    |   2 & 3    |   1 & 2   |   2 & 3   |  2 & 3   |
   |------------------------------------------------------------|
   | Note: Pins designated should be in closed position.        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |   Type   |    JP14    |    JP15    |         JP16          |
   |----------+------------+------------+-----------------------|
   | 80486SX  | pins 2 & 3 |    Open    |   pins 2 & 3 closed   |
   |          |   closed   |            |                       |
   |----------+------------+------------+-----------------------|
   | 80487SX  | pins 1 & 2 | pins 2 & 3 |   pins 1 & 2, 3 & 4   |
   |          |   closed   |   closed   |        closed         |
   |----------+------------+------------+-----------------------|
   | 80486DX  | pins 1 & 2 | pins 1 & 2 |   pins 1 & 2, 3 & 4   |
   |          |   closed   |   closed   |        closed         |
   |----------+------------+------------+-----------------------|
   | 80486DX2 | pins 1 & 2 | pins 2 & 3 |   pins 1 & 2, 3 & 4   |
   |          |   closed   |   closed   |        closed         |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |           Speed            |              JP5              |
   |----------------------------+-------------------------------|
   |           20MHz            |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |           25MHz            |       pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |           33MHz            |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |           50iMHz           |       pins 2 & 3 closed       |
   +------------------------------------------------------------+