+ # General purpose byte (GPB)
+ my $gdp = ord(substr($card,$pos+0x39,1));
+ printf "ADV (MAD version code): %d\n", $gdp & 0b00000011;
+ printf "MA (multiapplication): %s\n", $gdp & 0b01000000 ? 'yes' : 'monoaplication';
+ printf "DA (MAD available): %s\n", $gdp & 0b10000000 ? 'yes' : 'no';