diff --git a/libraries/u8glib/u8g_com_api_16gr.c b/libraries/u8glib/u8g_com_api_16gr.c
deleted file mode 100644
--- a/libraries/u8glib/u8g_com_api_16gr.c
+++ /dev/null
@@ -1,94 +0,0 @@
-/*
-
-  u8g_com_api_16gr.c
-  
-  Extension of the com api for devices with 16 graylevels (4 bit per pixel).
-  This should fit to the 8h and 16h architectures (pb8v1, pb8v2, pb16v1, pb16v2), 
-  mainly intended for SSD OLEDs
-
-  Universal 8bit Graphics Library
-  
-  Copyright (c) 2011, olikraus@gmail.com
-  All rights reserved.
-
-  Redistribution and use in source and binary forms, with or without modification, 
-  are permitted provided that the following conditions are met:
-
-  * Redistributions of source code must retain the above copyright notice, this list 
-    of conditions and the following disclaimer.
-    
-  * Redistributions in binary form must reproduce the above copyright notice, this 
-    list of conditions and the following disclaimer in the documentation and/or other 
-    materials provided with the distribution.
-
-  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
-  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
-  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
-  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
-  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
-  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
-  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
-  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 
-  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
-  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
-  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
-  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
-  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  
-  
-  
-*/
-
-#include "u8g.h"
-
-/* interpret b as a monochrome bit pattern, write value 15 for high bit and value 0 for a low bit */
-/* topbit (msb) is sent last */
-/* example: b = 0x083 will send 0xff, 0x00, 0x00, 0xf0 */
-uint8_t u8g_WriteByteBWTo16GrDevice(u8g_t *u8g, u8g_dev_t *dev, uint8_t b)
-{
-  static uint8_t buf[4];
-  static uint8_t map[4] = { 0, 0x00f, 0x0f0, 0x0ff };
-  buf [3] = map[b & 3];
-  b>>=2;
-  buf [2] = map[b & 3];
-  b>>=2;
-  buf [1] = map[b & 3];
-  b>>=2;
-  buf [0] = map[b & 3];
-  return dev->com_fn(u8g, U8G_COM_MSG_WRITE_SEQ, 4, buf);
-}
-
-uint8_t u8g_WriteSequenceBWTo16GrDevice(u8g_t *u8g, u8g_dev_t *dev, uint8_t cnt, uint8_t *ptr)
-{
-  do
-  {
-    if ( u8g_WriteByteBWTo16GrDevice(u8g, dev, *ptr++) == 0 )
-      return 0;
-    cnt--;
-  } while( cnt != 0 );
-  return 1;
-}
-
-/* interpret b as a 4L bit pattern, write values 0x000, 0x004, 0x008, 0x00c */
-uint8_t u8g_WriteByte4LTo16GrDevice(u8g_t *u8g, u8g_dev_t *dev, uint8_t b)
-{
-  //static uint8_t map[16] = { 0x000, 0x004, 0x008, 0x00c, 0x040, 0x044, 0x048, 0x04c, 0x080, 0x084, 0x088, 0x08c, 0x0c0, 0x0c4, 0x0c8, 0x0cc};
-  //static uint8_t map[16] = { 0x000, 0x004, 0x00a, 0x00f, 0x040, 0x044, 0x04a, 0x04f, 0x0a0, 0x0a4, 0x0aa, 0x0af, 0x0f0, 0x0f4, 0x0fa, 0x0ff};
-  static uint8_t map[16] = { 0x000, 0x040, 0x0a0, 0x0f0, 0x004, 0x044, 0x0a4, 0x0f4, 0x00a, 0x04a, 0x0aa, 0x0fa, 0x00f, 0x04f, 0x0af, 0x0ff};
-  uint8_t bb;
-  bb = b;
-  bb &= 15;
-  b>>=4;
-  dev->com_fn(u8g, U8G_COM_MSG_WRITE_BYTE, map[bb], NULL);
-  return dev->com_fn(u8g, U8G_COM_MSG_WRITE_BYTE, map[b], NULL);
-}
-
-uint8_t u8g_WriteSequence4LTo16GrDevice(u8g_t *u8g, u8g_dev_t *dev, uint8_t cnt, uint8_t *ptr)
-{
-  do
-  {
-    if ( u8g_WriteByte4LTo16GrDevice(u8g, dev, *ptr++) == 0 )
-      return 0;
-    cnt--;
-  } while( cnt != 0 );
-  return 1;
-}