MAGITRONICS
===========

   486SX/486DX/486DX2 (VER. 2)

   Processor         80486SX/80486DX/80486DX2/Pentium Overdrive   
   Processor Speed   25/33/40/50(internal)/50/66(internal)MHz     
   Chip Set          Unidentified                                 
   Max. Onboard DRAM 64MB                                         
   Cache             64/128/256KB                                 
   BIOS              AMI                                          
   Dimensions        254mm x 220mm                                
   I/O Options       32-bit VESA local bus slots (3)              
   NPU Options       None                                         

<gopher://bitreich.org/I/th99/m/M-O/31971-1.png>
   

   +------------------------------------------------------------+
   |                        CONNECTIONS                         |
   |------------------------------------------------------------|
   | Purpose           | Location | Purpose          | Location |
   |-------------------+----------+------------------+----------|
   | External battery  |    J1    | Speaker          |   JP16   |
   |-------------------+----------+------------------+----------|
   | Power LED &       |   J21    | Reset switch     |    S1    |
   | keylock           |          |                  |          |
   |-------------------+----------+------------------+----------|
   | Turbo LED         |   JP12   | 32-bit VESA      |  SL1 -   |
   |                   |          | local bus slots  |   SL3    |
   |-------------------+----------+------------------+----------|
   | Turbo switch      |   JP13   |                  |          |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 USER CONFIGURABLE SETTINGS                 |
   |------------------------------------------------------------|
   |              Function              | Jumper |   Position   |
   |------------------------------------+--------+--------------|
   |>> | CMOS memory normal operation   |  JP1   |  pins 2 & 3  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |   | CMOS memory clear              |  JP1   |  pins 1 & 2  |
   |   |                                |        |    closed    |
   |---+--------------------------------+--------+--------------|
   |>> | Monitor type select color      |  JP2   |    Closed    |
   |---+--------------------------------+--------+--------------|
   |   | Monitor type select monochrome |  JP2   |     Open     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                     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        |
   |------------------+--------------------+--------------------|
   |       17MB       |    (4) 256K x 9    |     (4) 4M x 9     |
   |------------------+--------------------+--------------------|
   |       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     |
   |------------------+--------------------+--------------------|
   |       64MB       |    (4) 16M x 9     |        NONE        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                    CACHE CONFIGURATION                     |
   |------------------------------------------------------------|
   | Size  |   Bank 0    |   Bank 1    |          TAG           |
   |-------+-------------+-------------+------------------------|
   | 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) 16K x 8 or (1) 32K |
   |       |             |             |          x 8           |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                 CACHE JUMPER CONFIGURATION                 |
   |------------------------------------------------------------|
   | Size  |       JP3       |      JP5       |  JP8   |  JP9   |
   |-------+-----------------+----------------+--------+--------|
   | 64KB  |   pins 2 & 3    |   pins 2 & 3   |  Open  |  Open  |
   |       |     closed      |     closed     |        |        |
   |-------+-----------------+----------------+--------+--------|
   | 128KB |   pins 1 & 2    |   pins 1 & 2   | Closed |  Open  |
   |       |     closed      |     closed     |        |        |
   |-------+-----------------+----------------+--------+--------|
   | 256KB |   pins 2 & 3    |   pins 2 & 3   | Closed | Closed |
   |       |     closed      |     closed     |        |        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                   CPU TYPE CONFIGURATION                   |
   |------------------------------------------------------------|
   |    Type     |       JP6        |       JP7        |  JP11  |
   |-------------+------------------+------------------+--------|
   |   80486SX   |    pins 2 & 3    |    pins 2 & 3    |  Open  |
   |             |      closed      |      closed      |        |
   |-------------+------------------+------------------+--------|
   | 80486DX/DX2 |    pins 1 & 2    |    pins 1 & 2    | Closed |
   |             |      closed      |      closed      |        |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  CPU SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |     Speed     |     JP18     |     JP19     |     JP20     |
   |---------------+--------------+--------------+--------------|
   |     25MHz     |    Closed    |     Open     |    Closed    |
   |---------------+--------------+--------------+--------------|
   |     33MHz     |    Closed    |    Closed    |     Open     |
   |---------------+--------------+--------------+--------------|
   |     40MHz     |     Open     |     Open     |    Closed    |
   |---------------+--------------+--------------+--------------|
   |    50iMHz     |    Closed    |     Open     |    Closed    |
   |---------------+--------------+--------------+--------------|
   |     50MHz     |     Open     |    Closed    |     Open     |
   |---------------+--------------+--------------+--------------|
   |    66iMHz     |    Closed    |    Closed    |     Open     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                CPU ADS DELAY CONFIGURATION                 |
   |------------------------------------------------------------|
   |           Speed            |             JP21              |
   |----------------------------+-------------------------------|
   |           33MHz            |       pins 2 & 3 closed       |
   |----------------------------+-------------------------------|
   |           40MHz            |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |           50MHz            |       pins 1 & 2 closed       |
   |----------------------------+-------------------------------|
   |           66iMHz           |       pins 2 & 3 closed       |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |               VESA WAIT STATE CONFIGURATION                |
   |------------------------------------------------------------|
   |          Wait states          |            JP17            |
   |-------------------------------+----------------------------|
   |         0 wait states         |            Open            |
   |-------------------------------+----------------------------|
   |         1 wait state          |           Closed           |
   |------------------------------------------------------------|
   | Note: The location of JP17 is unknown.                     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                  BUS SPEED CONFIGURATION                   |
   |------------------------------------------------------------|
   |           CPU speed           |            JP14            |
   |-------------------------------+----------------------------|
   |           <= 33MHz            |            Open            |
   |-------------------------------+----------------------------|
   |            > 33MHz            |           Closed           |
   |------------------------------------------------------------|
   | Note: The location of JP14 is unknown.                     |
   +------------------------------------------------------------+

   +------------------------------------------------------------+
   |                MISCELLANEOUS TECHNICAL NOTE                |
   |------------------------------------------------------------|
   |      Note:The location of jumpers on diagram are for       |
   |      identification purposes and may not be the actual     |
   |      location.                                             |
   +------------------------------------------------------------+