implement patch from DanielC
diff --git a/pyparallel/parallel/parallelwin32.py b/pyparallel/parallel/parallelwin32.py
index 5754578..c8f0d23 100644
--- a/pyparallel/parallel/parallelwin32.py
+++ b/pyparallel/parallel/parallelwin32.py
@@ -77,6 +77,14 @@
     def setData(self, value):
         _pyparallel.outp(self.dataRegAdr, value)
 
+    def setDataDir( self, level):
+        """set for port as input, clear for output"""
+        if level:
+            self.ctrlReg |= 0x20
+        else:
+            self.ctrlReg &= ~0x20
+        _pyparallel.outp(self.ctrlRegAdr, self.ctrlReg)
+
     # control register output functions
     def setDataStrobe(self, level):
         """data strobe bit"""
@@ -101,7 +109,7 @@
         else:
             self.ctrlReg = self.ctrlReg & ~0x04
         _pyparallel.outp(self.ctrlRegAdr, self.ctrlReg)
-    
+
     def setSelect(self, level):
         """select bit"""
         if level: