%Image::ExifTool::UserDefined = (
    'Image::ExifTool::Olympus::Main' => {
        0x600 => { #PH/4/22
            Name => 'DriveMode',
            Writable => 'int16u',
            Count => -1,
            Notes => '2, 3 or 5 numbers: 1. Mode, 2. Shot number, 3. Mode bits, 5. Shutter mode, 6. Shooting mode (E-M1 II and later models)',
            PrintConv => q {
                my ($a,$b,$c,$d,$e,$f) = split ' ',$val;
                if ($f) {
                  my %f = (
                     0x01 => 'Single Shot',
                     0x03 => 'Sequential H',
                     0x11 => 'Single Shot; Anti-shock',
                     0x12 => 'Sequential L; Anti-shock',
                     0x14 => 'Self-Timer 12 sec; Anti-shock',
                     0x15 => 'Self-Timer 2 sec; Anti-shock',
                     0x16 => 'Custom Self-Timer; Anti-shock',
                     0x17 => 'Sequential; Anti-shock',
                     0x21 => 'High Res (OM); Electronical shutter',
                     0x22 => 'Sequential L; Electronical shutter',
                     0x23 => 'Sequential H; Electronical shutter',
                     0x24 => 'Self-Timer 2 sec; Electronical shutter',
                     0x25 => 'Self-Timer 12 sec; Electronical shutter',
                     0x26 => 'Custom Self-Timer; Electronical shutter',
                     0x27 => 'Sequential; Electronical shutter',
                     0x28 => 'High-speed Sequential SH1; Electronical shutter',
                     0x29 => 'High-speed Sequential SH2; Electronical shutter',
                     0x3a => 'HighRes (E-M1); Electronical shutter',
                     0x41 => 'ProCap H; Electronical shutter',
                     0x42 => 'ProCap L; Electronical shutter',
                     0x43 => 'ProCap; Electronical shutter',
                     0x48 => 'ProCap SH1; Electronical shutter',
                     0x49 => 'ProCap SH2; Electronical shutter',
                  );
                  $f = $f{$f} || "Unknown ($f)";
                  if ($b == 0) {
                    return "$f";
                  } else {
                    return "$f, Shot $b";
                  }
                }
                if ($e) {
                    $e = '; ' . ({ 2 => 'Anti-shock 0', 4 => 'Electronic shutter' }->{$e} || "Unknown ($e)");
                } else {
                    $e = '';
                }
                return "Single Shot$e" unless $a;
                if ($a == 5 and defined $c) {
                    $a = DecodeBits($c, { #6
                        0 => 'AE',
                        1 => 'WB',
                        2 => 'FL',
                        3 => 'MF',
                        4 => 'ISO', #forum8906
                        5 => 'AE Auto', #forum8906
                        6 => 'Focus', #PH
                    }) . ' Bracketing';
                    $a =~ s/, /+/g;
                } else {
                    my %a = (
                        1 => 'Continuous Shooting',
                        2 => 'Exposure Bracketing',
                        3 => 'White Balance Bracketing',
                        4 => 'Exposure+WB Bracketing', #6
                    );
                    $a = $a{$a} || "Unknown ($a)";
                }
                return "$a, Shot $b$e";
            },
        },
    },
);

1;  # Important: must return true