diff --git a/Lib/macpath.py b/Lib/macpath.py
index 7d6ae41..c023646 100644
--- a/Lib/macpath.py
+++ b/Lib/macpath.py
@@ -13,6 +13,7 @@
            "devnull","realpath","supports_unicode_filenames"]
 
 # strings representing various path-related bits and pieces
+# These are primarily for export; internally, they are hardcoded.
 curdir = ':'
 pardir = '::'
 extsep = '.'
@@ -22,6 +23,12 @@
 altsep = None
 devnull = 'Dev:Null'
 
+def _get_colon(path):
+    if isinstance(path, bytes):
+        return b':'
+    else:
+        return ':'
+
 # Normalize the case of a pathname.  Dummy in Posix, but <s>.lower() here.
 
 def normcase(path):
@@ -35,21 +42,23 @@
     Anything else is absolute (the string up to the first colon is the
     volume name)."""
 
-    return ':' in s and s[0] != ':'
+    colon = _get_colon(s)
+    return colon in s and s[:1] != colon
 
 
 def join(s, *p):
+    colon = _get_colon(s)
     path = s
     for t in p:
         if (not s) or isabs(t):
             path = t
             continue
-        if t[:1] == ':':
+        if t[:1] == colon:
             t = t[1:]
-        if ':' not in path:
-            path = ':' + path
-        if path[-1:] != ':':
-            path = path + ':'
+        if colon not in path:
+            path = colon + path
+        if path[-1:] != colon:
+            path = path + colon
         path = path + t
     return path
 
@@ -59,18 +68,22 @@
     bit, and the basename (the filename, without colons, in that directory).
     The result (s, t) is such that join(s, t) yields the original argument."""
 
-    if ':' not in s: return '', s
-    colon = 0
+    colon = _get_colon(s)
+    if colon not in s: return s[:0], s
+    col = 0
     for i in range(len(s)):
-        if s[i] == ':': colon = i + 1
-    path, file = s[:colon-1], s[colon:]
-    if path and not ':' in path:
-        path = path + ':'
+        if s[i:i+1] == colon: col = i + 1
+    path, file = s[:col-1], s[col:]
+    if path and not colon in path:
+        path = path + colon
     return path, file
 
 
 def splitext(p):
-    return genericpath._splitext(p, sep, altsep, extsep)
+    if isinstance(p, bytes):
+        return genericpath._splitext(p, b':', altsep, b'.')
+    else:
+        return genericpath._splitext(p, sep, altsep, extsep)
 splitext.__doc__ = genericpath._splitext.__doc__
 
 def splitdrive(p):
@@ -80,7 +93,7 @@
     syntactic and semantic oddities as DOS drive letters, such as there
     being a separate current directory per drive)."""
 
-    return '', p
+    return p[:0], p
 
 
 # Short interfaces to split()
@@ -92,7 +105,7 @@
     if not isabs(s):
         return False
     components = split(s)
-    return len(components) == 2 and components[1] == ''
+    return len(components) == 2 and not components[1]
 
 def islink(s):
     """Return true if the pathname refers to a symbolic link."""
@@ -131,13 +144,15 @@
     """Normalize a pathname.  Will return the same result for
     equivalent paths."""
 
-    if ":" not in s:
-        return ":"+s
+    colon = _get_colon(s)
 
-    comps = s.split(":")
+    if colon not in s:
+        return colon + s
+
+    comps = s.split(colon)
     i = 1
     while i < len(comps)-1:
-        if comps[i] == "" and comps[i-1] != "":
+        if not comps[i] and comps[i-1]:
             if i > 1:
                 del comps[i-1:i+1]
                 i = i - 1
@@ -147,10 +162,10 @@
         else:
             i = i + 1
 
-    s = ":".join(comps)
+    s = colon.join(comps)
 
     # remove trailing ":" except for ":" and "Volume:"
-    if s[-1] == ":" and len(comps) > 2 and s != ":"*len(s):
+    if s[-1:] == colon and len(comps) > 2 and s != colon*len(s):
         s = s[:-1]
     return s
 
@@ -169,8 +184,9 @@
         return path
     if not path:
         return path
-    components = path.split(':')
-    path = components[0] + ':'
+    colon = _get_colon(path)
+    components = path.split(colon)
+    path = components[0] + colon
     for c in components[1:]:
         path = join(path, c)
         path = Carbon.File.FSResolveAliasFile(path, 1)[0].as_pathname()
diff --git a/Lib/test/test_macpath.py b/Lib/test/test_macpath.py
index 38b85e5..368d8f5 100644
--- a/Lib/test/test_macpath.py
+++ b/Lib/test/test_macpath.py
@@ -18,6 +18,14 @@
         self.failIf(isabs(":foo:bar"))
         self.failIf(isabs(":foo:bar:"))
 
+        self.assert_(isabs(b"xx:yy"))
+        self.assert_(isabs(b"xx:yy:"))
+        self.assert_(isabs(b"xx:"))
+        self.failIf(isabs(b"foo"))
+        self.failIf(isabs(b":foo"))
+        self.failIf(isabs(b":foo:bar"))
+        self.failIf(isabs(b":foo:bar:"))
+
 
     def test_commonprefix(self):
         commonprefix = macpath.commonprefix
@@ -28,6 +36,13 @@
         self.assert_(commonprefix([":home:swen:spam", ":home:swen:spam"])
                      == ":home:swen:spam")
 
+        self.assert_(commonprefix([b"home:swenson:spam", b"home:swen:spam"])
+                     == b"home:swen")
+        self.assert_(commonprefix([b":home:swen:spam", b":home:swen:eggs"])
+                     == b":home:swen:")
+        self.assert_(commonprefix([b":home:swen:spam", b":home:swen:spam"])
+                     == b":home:swen:spam")
+
     def test_split(self):
         split = macpath.split
         self.assertEquals(split("foo:bar"),
@@ -39,11 +54,37 @@
         self.assertEquals(split(":conky:mountpoint:"),
                           (':conky:mountpoint', ''))
 
+        self.assertEquals(split(b"foo:bar"),
+                          (b'foo:', b'bar'))
+        self.assertEquals(split(b"conky:mountpoint:foo:bar"),
+                          (b'conky:mountpoint:foo', b'bar'))
+
+        self.assertEquals(split(b":"), (b'', b''))
+        self.assertEquals(split(b":conky:mountpoint:"),
+                          (b':conky:mountpoint', b''))
+
+    def test_join(self):
+        join = macpath.join
+        self.assertEquals(join('a', 'b'), ':a:b')
+        self.assertEquals(join('', 'a:b'), 'a:b')
+        self.assertEquals(join('a:b', 'c'), 'a:b:c')
+        self.assertEquals(join('a:b', ':c'), 'a:b:c')
+        self.assertEquals(join('a', ':b', ':c'), ':a:b:c')
+
+        self.assertEquals(join(b'a', b'b'), b':a:b')
+        self.assertEquals(join(b'', b'a:b'), b'a:b')
+        self.assertEquals(join(b'a:b', b'c'), b'a:b:c')
+        self.assertEquals(join(b'a:b', b':c'), b'a:b:c')
+        self.assertEquals(join(b'a', b':b', b':c'), b':a:b:c')
+
     def test_splitdrive(self):
         splitdrive = macpath.splitdrive
         self.assertEquals(splitdrive("foo:bar"), ('', 'foo:bar'))
         self.assertEquals(splitdrive(":foo:bar"), ('', ':foo:bar'))
 
+        self.assertEquals(splitdrive(b"foo:bar"), (b'', b'foo:bar'))
+        self.assertEquals(splitdrive(b":foo:bar"), (b'', b':foo:bar'))
+
     def test_splitext(self):
         splitext = macpath.splitext
         self.assertEquals(splitext(":foo.ext"), (':foo', '.ext'))
@@ -54,6 +95,49 @@
         self.assertEquals(splitext(""), ('', ''))
         self.assertEquals(splitext("foo.bar.ext"), ('foo.bar', '.ext'))
 
+        self.assertEquals(splitext(b":foo.ext"), (b':foo', b'.ext'))
+        self.assertEquals(splitext(b"foo:foo.ext"), (b'foo:foo', b'.ext'))
+        self.assertEquals(splitext(b".ext"), (b'.ext', b''))
+        self.assertEquals(splitext(b"foo.ext:foo"), (b'foo.ext:foo', b''))
+        self.assertEquals(splitext(b":foo.ext:"), (b':foo.ext:', b''))
+        self.assertEquals(splitext(b""), (b'', b''))
+        self.assertEquals(splitext(b"foo.bar.ext"), (b'foo.bar', b'.ext'))
+
+    def test_ismount(self):
+        ismount = macpath.ismount
+        self.assertEquals(ismount("a:"), True)
+        self.assertEquals(ismount("a:b"), False)
+        self.assertEquals(ismount("a:b:"), True)
+        self.assertEquals(ismount(""), False)
+        self.assertEquals(ismount(":"), False)
+
+        self.assertEquals(ismount(b"a:"), True)
+        self.assertEquals(ismount(b"a:b"), False)
+        self.assertEquals(ismount(b"a:b:"), True)
+        self.assertEquals(ismount(b""), False)
+        self.assertEquals(ismount(b":"), False)
+
+    def test_normpath(self):
+        normpath = macpath.normpath
+        self.assertEqual(normpath("a:b"), "a:b")
+        self.assertEqual(normpath("a"), ":a")
+        self.assertEqual(normpath("a:b::c"), "a:c")
+        self.assertEqual(normpath("a:b:c:::d"), "a:d")
+        self.assertRaises(macpath.norm_error, normpath, "a::b")
+        self.assertRaises(macpath.norm_error, normpath, "a:b:::c")
+        self.assertEqual(normpath(":"), ":")
+        self.assertEqual(normpath("a:"), "a:")
+        self.assertEqual(normpath("a:b:"), "a:b")
+
+        self.assertEqual(normpath(b"a:b"), b"a:b")
+        self.assertEqual(normpath(b"a"), b":a")
+        self.assertEqual(normpath(b"a:b::c"), b"a:c")
+        self.assertEqual(normpath(b"a:b:c:::d"), b"a:d")
+        self.assertRaises(macpath.norm_error, normpath, b"a::b")
+        self.assertRaises(macpath.norm_error, normpath, b"a:b:::c")
+        self.assertEqual(normpath(b":"), b":")
+        self.assertEqual(normpath(b"a:"), b"a:")
+        self.assertEqual(normpath(b"a:b:"), b"a:b")
 
 def test_main():
     support.run_unittest(MacPathTestCase)