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    The feature bits are set from Input Status register 0 in response to
    an output on the specified Feature Control register bits:
 
      Feature     Feature Control     Input Status
      Bit(s)      Output Bit          Bit
      ═══════     ═══════════════     ════════════
      0           0                   5
      1           0                   6
      2           1                   5
      3           1                   6
      4-7         not used
 
    The bits in the switch settings byte indicate the state of the EGA's
    configuration DIP switch (1 =off, 0 =on).
 
      Bit     Significance
      ═══     ══════════════════════
      0       configuration switch 1
      1       configuration switch 2
      2       configuration switch 3
      3       configuration switch 4
      4-7     not used
                                    -♦-