diff --git a/atrcopy/ataridos.py b/atrcopy/ataridos.py
index b573858..f5b3f0f 100644
--- a/atrcopy/ataridos.py
+++ b/atrcopy/ataridos.py
@@ -102,7 +102,8 @@ class AtariDosDirent(Dirent):
         self.parse_raw_dirent(image, bytes)
 
     def __str__(self):
-        return "File #%-2d (%s) %03d %-8s%-3s  %03d" % (self.file_num, self.summary, self.starting_sector, str(self.basename), str(self.ext), self.num_sectors)
+        # return (b'File #%-2d (%s) %03d %-8s%-3s  %03d' % (self.file_num, self.summary.encode("utf-8"), self.starting_sector, self.basename, self.ext, self.num_sectors)).decode("utf-8")
+        return "File #%-2d (%s) %03d %-8s%-3s  %03d" % (self.file_num, self.summary, self.starting_sector, self.basename.decode("utf-8"), self.ext.decode("utf-8"), self.num_sectors)
 
     def __eq__(self, other):
         return self.__class__ == other.__class__ and self.filename == other.filename and self.starting_sector == other.starting_sector and self.num_sectors == other.num_sectors
diff --git a/atrcopy/cartridge.py b/atrcopy/cartridge.py
index 78f0693..1ee7e37 100644
--- a/atrcopy/cartridge.py
+++ b/atrcopy/cartridge.py
@@ -166,7 +166,7 @@ class A8CartHeader(object):
     def to_array(self):
         raw = np.zeros([16], dtype=np.uint8)
         values = raw.view(dtype=self.format)[0]
-        values[0] = 'CART'
+        values[0] = b'CART'
         values[1] = self.cart_type
         values[2] = self.crc
         values[3] = 0
diff --git a/atrcopy/dos33.py b/atrcopy/dos33.py
index adc82af..d7c24fc 100644
--- a/atrcopy/dos33.py
+++ b/atrcopy/dos33.py
@@ -180,7 +180,7 @@ class Dos33Dirent(Dirent):
         self.parse_raw_dirent(image, bytes)
 
     def __str__(self):
-        return "File #%-2d (%s) %03d %-30s %03d %03d" % (self.file_num, self.summary, self.num_sectors, self.filename, self.track, self.sector)
+        return "File #%-2d (%s) %03d %-30s %03d %03d" % (self.file_num, self.summary, self.num_sectors, self.filename.decode("utf-8"), self.track, self.sector)
 
     def __eq__(self, other):
         return self.__class__ == other.__class__ and self.filename == other.filename and self.track == other.track and self.sector == other.sector and self.num_sectors == other.num_sectors