+                   +  Exact    +   Matching 
          |     Reserved      |  Match    |   File Specifications
      +---+---+---+---+---+---+-----+-----+---+---+---+---+---+---+---+---+     
      | M | R | R | R | R | R | nam | ext | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |     
      +-+-+-+-+-+-+-+-+-+-+-+-+--+--+--+--+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
        |   |   |   |   |   |    |     |    |   |   |   |   |   |   |   |
        +   +   +   +   +   +    +     +    +   +   +   +   +   +   +   +
       15  14  13  12  11  10    9     8    7   6   5   4   3   2   1   0