diff --git a/cept.py b/cept.py
index cd567cb..032cccc 100644
--- a/cept.py
+++ b/cept.py
@@ -6,81 +6,87 @@ released under GPL
 '''
 
 CR = "\x0d"
-LF = "\x0a"
 UMLAUT = "\xc9"
 INI = "\x13"
 TER = "\x1c"
 SEND = "\x1a"
 CURSOR_ON = "\x11"
+CURSOR_OFF = "\x14"
 BSP = "\x08"  # backspace
 CLEARLINE = "\x18"
 
+# TODO: stimmt das?
+LEFT = "\x08"
+RIGHT = "\x09"
+DOWN = "\x0a"
+UP = "\x0b"
+
 clear_line24 = (
-	"\x1f\x58\x41"		# Cursor Zeile 24, Spalte 0
-	"\x18" 				# Zeile löschen
-	)
+    "\x1f\x58\x41"      # Cursor Zeile 24, Spalte 0
+    "\x18"              # Zeile löschen
+    )
 
 error_prefix = (
-	"\x1f\x2f\x40\x58"  # Servicesprung Zeile 24
-	)
+    "\x1f\x2f\x40\x58"  # Servicesprung Zeile 24
+    )
 error_suffix = (
-	"\x1f\x2f\x4f"		# Ende Servicesprung
-	"\x1f\x58\x41"		# Cursor Zeile 24, Spalte 0
-	)
+    "\x1f\x2f\x4f"      # Ende Servicesprung
+    "\x1f\x58\x41"      # Cursor Zeile 24, Spalte 0
+    )
 
 eingabezeile = ( 
-	"\x1b" # Hintergrund blau ganze Reihe
-	"\x23" 
-	"\x21" 
-	"\x54"
-	"\x44" # Hintergrund blau, Vordergrund gelb
-	"\x83" )
+    "\x1b" # Hintergrund blau ganze Reihe
+    "\x23" 
+    "\x21" 
+    "\x54"
+    "\x44" # Hintergrund blau, Vordergrund gelb
+    "\x83" )
 
 init_screen = ( 
-		"\x1f" "\x2f" "\x42"		# Grundzustand parallel
-		"\x9b"
-		"\x30" "\x32" "\x3b" "\x32" "\x33" "\x55"	# Scrollbereich ist Zeile 2 - 23
-		"\x9b"
-		"\x32" "\x60"								# Implizites Scrollen an
-		"\x1b" "\x23" "\x21" "\x54"					# Hintergrund blau ganze Reihe
-		"\x94" "\x83"								# Hintergrund blau, Vordergrund gelb
-		"\x42" "\x74" "\x78" "\x20" "\x53" "\x65" "\x72" "\x76" "\x65" "\x72"	# Btx Server
-		"\x20" "\x2d" "\x20" "\x4E" "\x6F" "\x72" "\x62" "\x65" "\x72" "\x74"	#  - Norbert
-		"\x20" "\x4B" "\x65" "\x68" "\x72" "\x65" "\x72" "\x2c" "\x20"			# Kehrer, 
-		"\x41" "\x70" "\x72" "\x69" "\x6C" "\x20" "\x32" "\x30" "\x31" "\x36"	# April 2016 
-		"\x90" "\x87"								# Hintergrund schwarz, Vordergrund weisz
-		"\x0d" "\x0a"								# CR/LF
-		"\x11"										# Cursor on
-	)
+        "\x1f" "\x2f" "\x42"        # Grundzustand parallel
+        "\x9b"
+        "\x30" "\x32" "\x3b" "\x32" "\x33" "\x55"   # Scrollbereich ist Zeile 2 - 23
+        "\x9b"
+        "\x32" "\x60"                               # Implizites Scrollen an
+        "\x1b" "\x23" "\x21" "\x54"                 # Hintergrund blau ganze Reihe
+        "\x94" "\x83"                               # Hintergrund blau, Vordergrund gelb
+        "\x42" "\x74" "\x78" "\x20" "\x53" "\x65" "\x72" "\x76" "\x65" "\x72"   # Btx Server
+        "\x20" "\x2d" "\x20" "\x4E" "\x6F" "\x72" "\x62" "\x65" "\x72" "\x74"   #  - Norbert
+        "\x20" "\x4B" "\x65" "\x68" "\x72" "\x65" "\x72" "\x2c" "\x20"          # Kehrer, 
+        "\x41" "\x70" "\x72" "\x69" "\x6C" "\x20" "\x32" "\x30" "\x31" "\x36"   # April 2016 
+        "\x90" "\x87"                               # Hintergrund schwarz, Vordergrund weisz
+        "\x0d" "\x0a"                               # CR/LF
+        "\x11"                                      # Cursor on
+    )
 
 btxlogo = (
-		"\x1f\x2f\x42"		# Grundzustand parallel
-		"\x1b\x7e"			# Zeichensatz G1 rechts
-		"\x9b\x31\x40"		# Farbtafel 1 (Halbtöne)
-		"\x1b\x23\x20\x54"	# ganzer Schirm blau
-		"\x1f\x3d1# 200961a\x1f" # Link zur Demo-Startseite 200961a
-		"\x1f\x43\x48\xb8\xa3\x12\x57\xe4"
-		"\x1f\x44\x47\xea\xa0\x12\x59\xb5"
-		"\x1f\x45\x47\xea      \xe8\xfc\xdf\x12\x49\xfc\xb4      \xb5"
-		"\x1f\x46\x47\xea    \xe8\xdf\x12\x44\xa3\x12\x45\xdf\x12\x44\xb4    \xb5"
-		"\x1f\x47\x47\xea    \xaa\xdf\xdf\xdf\xaf\xa1 \xfc\xdf\xdf\xfc \xa2\xaf\xdf\xdf\xdf\xa5    \xb5"
-		"\x1f\x48\x47\xea     \xa2\xe3\xf8\xfe\xdf\xea\xdf\x12\x43\xb5\xdf\xfd\xf4\xb3\xa1     \xb5"
-		"\x1f\x49\x47\xea      \xdf\x12\x43\xea\xdf\x12\x43\xb5\xdf\x12\x43      \xb5"
-		"\x1f\x4a\x47\xea      \xdf\x12\x43\xfd\xf3\xaf\xaf\xf3\xfe\xdf\x12\x43      \xb5"
-		"\x1f\x4b\x47\xea      \xdf\x12\x4d      \xb5" # Ende Telefon-Logo
-		"\x1f\x4c\x47\xea \x12\x59\xb5"
-		"\x1f\x4d\x47\xea \x12\x44\xbc\xb4\xf0\xb0\xf4\xe0\xb0\xf0\xb0\xec\xa4\xf0\xb0\xb0\xb0\xf4 \x12\x44\xb5" # Logo-Text 1
-		"\x1f\x4e\x47\xea \x12\x44\xbf\xb1\xbd\xa5\xb5\xea \xb5\xb5\xea \xbd\xa5\xb9\xb1\xb5 \x12\x44\xb5" # Logo-Text 2
-		"\x1f\x4f\x47\xea \x12\x44\xa1\xa1\xa3\xa1\xa3\xa2 \xa3\xa1\xa2 \xa3\xa1\xa1\xa1\xa3 \x12\x44\xb5" # Logo-Text 3
-		"\x1f\x50\x47\xa2\xe4\xa0\x12\x57\xb8\xa1"
-		"\x1f\x51\x49\xa3\x12\x57\r\n"
-		"\x9b\x31\x40"		# Farbtafel 1
-		"\x87\x19\x50\x12\x67" # Strich
-		"\x9b\x30\x40"		# Farbtafel 0
-		"\x87         Herzlich Willkommen in\r\n"
-		"\x87               retroText!\r\n"
-		"\x9b\x31\x40"		# Farbtafel 1
-		"\x87\x19\x50\x12\x67"
-		"\x9b\x30\x40"		# Farbtafel 0
-		"\x83Mit # fortfahren\r\n"
-	)
\ No newline at end of file
+        "\x1f\x2f\x42"      # Grundzustand parallel
+        "\x1b\x7e"          # Zeichensatz G1 rechts
+        "\x9b\x31\x40"      # Farbtafel 1 (Halbtöne)
+        "\x1b\x23\x20\x54"  # ganzer Schirm blau
+        "\x1f\x3d1# 200961a\x1f" # Link zur Demo-Startseite 200961a
+        "\x1f\x43\x48\xb8\xa3\x12\x57\xe4"
+        "\x1f\x44\x47\xea\xa0\x12\x59\xb5"
+        "\x1f\x45\x47\xea      \xe8\xfc\xdf\x12\x49\xfc\xb4      \xb5"
+        "\x1f\x46\x47\xea    \xe8\xdf\x12\x44\xa3\x12\x45\xdf\x12\x44\xb4    \xb5"
+        "\x1f\x47\x47\xea    \xaa\xdf\xdf\xdf\xaf\xa1 \xfc\xdf\xdf\xfc \xa2\xaf\xdf\xdf\xdf\xa5    \xb5"
+        "\x1f\x48\x47\xea     \xa2\xe3\xf8\xfe\xdf\xea\xdf\x12\x43\xb5\xdf\xfd\xf4\xb3\xa1     \xb5"
+        "\x1f\x49\x47\xea      \xdf\x12\x43\xea\xdf\x12\x43\xb5\xdf\x12\x43      \xb5"
+        "\x1f\x4a\x47\xea      \xdf\x12\x43\xfd\xf3\xaf\xaf\xf3\xfe\xdf\x12\x43      \xb5"
+        "\x1f\x4b\x47\xea      \xdf\x12\x4d      \xb5" # Ende Telefon-Logo
+        "\x1f\x4c\x47\xea \x12\x59\xb5"
+        "\x1f\x4d\x47\xea \x12\x44\xbc\xb4\xf0\xb0\xf4\xe0\xb0\xf0\xb0\xec\xa4\xf0\xb0\xb0\xb0\xf4 \x12\x44\xb5" # Logo-Text 1
+        "\x1f\x4e\x47\xea \x12\x44\xbf\xb1\xbd\xa5\xb5\xea \xb5\xb5\xea \xbd\xa5\xb9\xb1\xb5 \x12\x44\xb5" # Logo-Text 2
+        "\x1f\x4f\x47\xea \x12\x44\xa1\xa1\xa3\xa1\xa3\xa2 \xa3\xa1\xa2 \xa3\xa1\xa1\xa1\xa3 \x12\x44\xb5" # Logo-Text 3
+        "\x1f\x50\x47\xa2\xe4\xa0\x12\x57\xb8\xa1"
+        "\x1f\x51\x49\xa3\x12\x57\r\n"
+        "\x9b\x31\x40"      # Farbtafel 1
+        "\x87\x19\x50\x12\x67" # Strich
+        "\x9b\x30\x40"      # Farbtafel 0
+        "\x87         Herzlich Willkommen in\r\n"
+        "\x87               retroText!\r\n"
+        "\x9b\x31\x40"      # Farbtafel 1
+        "\x87\x19\x50\x12\x67"
+        "\x9b\x30\x40"      # Farbtafel 0
+        "\x83Mit # fortfahren\r\n"
+    )
\ No newline at end of file