RLL / MFM Interface (IDC 20 pin)

 ------------------//------------------
|  1  3  5  7 ... //.. 13  15  17  19  |     (Male)
|  2  4  6  8 .. //... 14  16  18  20  |
 ---------------//---------------------


PIN    SIGNAL             PIN    SIGNAL 

1......Drive Selected     2......GND
3......(reserved)         4......GND
5......(reserved)         6......GND
7......(reserved)         8......GND
9......(reserved)         10.....(reserved)
11.....GND                12.....GND
13.....Write Data+        14.....Write Data-
15.....GND                16.....GND
17.....Read Data+         18.....NRZ Read Data-
19.....GND                20.....GND

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