diff --git a/debug.py b/debug.py
index bf71002..bf2b132 100644
--- a/debug.py
+++ b/debug.py
@@ -2,27 +2,44 @@
 
 from twisted.internet import reactor
 
-__all__ = [ 'appendnamespace', 'insertnamespace', ]
+# Make sure to update the global line when adding a new function
+__all__ = [ 'appendnamespace', 'insertnamespace', 'insertringbuf' ]
+
+DEFAULTRINGSIZE = 50
 
 appendnamespace = lambda k, v: []
 insertnamespace = lambda k, v: None
+insertringbuf = lambda k, l = DEFAULTRINGSIZE: None
+
+# This code from: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/68429
+class RingBuffer:
+	def __init__(self,size_max):
+		self.max = size_max
+		self.data = []
+	def append(self,x):
+		"""append an element at the end of the buffer"""
+		self.data.append(x)
+		if len(self.data) == self.max:
+			self.cur=0
+			self.__class__ = RingBufferFull
+	def get(self):
+  		""" return a list of elements from the oldest to the newest"""
+		return self.data
+
+class RingBufferFull:
+	def __init__(self,n):
+		raise "you should use RingBuffer"
+	def append(self,x):		
+		self.data[self.cur]=x
+		self.cur=(self.cur+1) % self.max
+	def get(self):
+		return self.data[self.cur:]+self.data[:self.cur]
 
 def doDebugging(opt):
 	if not opt:
 		return
 
-	from twisted.manhole import telnet
-
-	class Debug(telnet.Shell):
-		def welcomeMessage(self):
-			data = [ '', 'PyMedS Debugging Console', '', '' ]
-			return '\r\n'.join(data)
-		
-	sf = telnet.ShellFactory()
-	sf.protocol = Debug
-	reactor.listenTCP(56283, sf)
-
-	global insertnamespace, appendnamespace
+	global insertnamespace, appendnamespace, insertringbuf
 
 	def insertnamespace(k, v):
 		assert isinstance(k, basestring)
@@ -33,3 +50,17 @@ def doDebugging(opt):
 			sf.namespace[k].append(v)
 		except KeyError:
 			sf.namespace[k] = [ v ]
+
+	def insertringbuf(k, l = DEFAULTRINGSIZE):
+		insertnamespace(k, RingBuffer(l))
+
+	from twisted.manhole import telnet
+
+	class Debug(telnet.Shell):
+		def welcomeMessage(self):
+			data = [ '', 'PyMedS Debugging Console', '', '' ]
+			return '\r\n'.join(data)
+		
+	sf = telnet.ShellFactory()
+	sf.protocol = Debug
+	reactor.listenTCP(56283, sf)