diff --git a/horrlang.py b/horrlang.py
index 14a84b6..1ea9b7e 100755
--- a/horrlang.py
+++ b/horrlang.py
@@ -23,8 +23,7 @@ class InfiniteArray:
 
 
 class Machine:
-    def __init__(self, code, read, write, user_data=None, max_cycles=None):
-        self.user_data = user_data
+    def __init__(self, code, read, write, max_cycles=None):
         self.read = read
         self.write = write
         self.mem = InfiniteArray([ord(char) for char in code])
@@ -102,14 +101,16 @@ class Machine:
         while True:
             if self.mem[self.exc_ptr] == 0:
                 return
-            control = chr(self.mem[self.exc_ptr])
-            if debug:
-                print control
-            if hasattr(self, control):
-                getattr(self, control)()
+            if self.mem[self.exc_ptr] <= 255:
+                control = chr(self.mem[self.exc_ptr])
+                if debug:
+                    print control
+                if hasattr(self, control):
+                    getattr(self, control)()
             self.exc_ptr += 1
             if not self.cycle():
                 return
 
 if __name__ == "__main__":
-    Machine(sys.argv[1], sys.stdin.read, sys.stdout.write, None).run()
+    Machine(sys.argv[1], sys.stdin.read, sys.stdout.write,
+            int(sys.argv[2]) if len(sys.argv) >= 2 else None).run()