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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
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