BTR - Bit Test with Reset (386+)

        Usage:  BTR     dest,src
        Modifies flags: CF

        The destination bit indexed by the source value is copied into the
        Carry Flag and then cleared in the destination.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg16,immed8      -     -     6     6            4-8
        mem16,immed8      -     -     8     8            4-8
        reg16,reg16       -     -     6     6            3-7
        mem16,reg16       -     -     13    13           3-7


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