diff --git a/rtxMask.py b/rtxMask.py
index 1142e52..545cdd7 100644
--- a/rtxMask.py
+++ b/rtxMask.py
@@ -61,6 +61,17 @@ class rtxMask:
 		zeile = zeile[:pos-1] + char + zeile[pos:]
 		answers[line] = zeile
 
+	def _cut_off_rest_of_line(self, line, pos):
+		""" erases the rest of the line from the 'lines' variable and from the screen """
+		zeile = self.answers[line]
+		self.answers[line] = zeile[:pos]
+
+		if zeile[pos:] != "":
+			numOfSpaces = len(zeile[pos:])
+			spaces = " " * numOfSpaces
+			backSpaces = "\x08" * numOfSpaces
+			glob.ser.write(bytes(spaces + backSpaces, "latin-1"))
+
 	def process_input(self):
 		""" reads the input from the client, fills the mask and gets the input """
 
@@ -70,12 +81,13 @@ class rtxMask:
 
 		# position the cursor into the first field
 		self._pos_cur_to_line(lines[1])
-		posx = 1  # cursor position inside the line
-		posy = 0  # the current line
+		posx = 0  # cursor position inside the line - max. position is length-1
+		posy = 0  # the current line - max. number is len(lines)-1
 
 		weiter = True
 		# read input and interpret it			
 		while weiter==True:
+			# if the modem hangs up, exit the function:
 			#if config.MODE == "modem" and glob.ser.getCD() == False:
 			#	weiter=False
 			in_byte = glob.ser.read(1)
@@ -83,7 +95,10 @@ class rtxMask:
 			echostr = instr
 
 			if instr == cept.TER or instr == cept.CR:
-				# TODO: weiter in nächster Zeile				
+				if posy == len(lines)-1:
+					# this was the last line, now send the data
+					# TODO
+					weiter = False
 			elif instr.isalnum():
 				self._set_str_at_pos(instr, posx, posy)
 				posx += 1
@@ -94,7 +109,6 @@ class rtxMask:
 				echostr = ""
 
 			# lineinput == Zeilenende beachten
-			# dafür aber die Konstruktion von lines nochmal umbauen, um auf "length" zugreifen zu können...
 
 			glob.ser.write(bytes(echostr, "latin-1"))
 
diff --git a/rtxModem.py b/rtxModem.py
index a022462..64125b7 100644
--- a/rtxModem.py
+++ b/rtxModem.py
@@ -12,6 +12,9 @@ import config
 import logging
 
 def init_modem():
+	logging.debug("clearing input/output buffers")
+	glob.ser.reset_input_buffer()
+	glob.ser.reset_output_buffer()
 	""" send the modem init strings to the modem """
 	logging.debug("init_modem")
 	if config.MODEM_INIT1 != "":