diff --git a/libraries/u8glib/u8g_pb.c b/libraries/u8glib/u8g_pb.c
deleted file mode 100644
--- a/libraries/u8glib/u8g_pb.c
+++ /dev/null
@@ -1,191 +0,0 @@
-/*
-
-  u8g_pb.c
-  
-  common procedures for the page buffer
-
-  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"
-
-void u8g_pb_Clear(u8g_pb_t *b)
-{
-  uint8_t *ptr = (uint8_t *)b->buf;
-  uint8_t *end_ptr = ptr;
-  end_ptr += b->width;
-  do
-  {
-    *ptr++ = 0;
-  } while( ptr != end_ptr );
-}
-
-/* the following procedure does not work. why? Can be checked with descpic */
-/*
-void u8g_pb_Clear(u8g_pb_t *b)
-{
-  uint8_t *ptr = (uint8_t *)b->buf;
-  uint8_t cnt = b->width;
-  do
-  {
-    *ptr++ = 0;
-    cnt--;
-  } while( cnt != 0 );
-}
-*/
-
-/*
-  intersection assumptions:
-    a1 <= a2 is always true    
-*/
-  /*
-    minimized version
-    ---1----0 1             b1 <= a2 && b1 > b2
-    -----1--0 1             b2 >= a1 && b1 > b2
-    ---1-1--- 1             b1 <= a2 && b2 >= a1
-  */
-/*
-uint8_t u8g_pb8v1_IsYIntersection___Old(u8g_pb_t *b, u8g_uint_t v0, u8g_uint_t v1)
-{
-  uint8_t c0, c1, c;
-  c0 = v0 <= b->p.page_y1;
-  c1 = v1 >= b->p.page_y0;
-  c = v0 > v1;
-  if ( c0 && c1 ) return 1;
-  if ( c0 && c ) return 1;
-  if ( c1 && c ) return 1;
-  return 0;
-}
-*/
-
-uint8_t u8g_pb_IsYIntersection(u8g_pb_t *pb, u8g_uint_t v0, u8g_uint_t v1)
-{
-  uint8_t c1, c2, c3, tmp;
-  c1 = v0 <= pb->p.page_y1;
-  c2 = v1 >= pb->p.page_y0;
-  c3 = v0 > v1;
-  /*
-  if ( c1 && c2 )
-    return 1;
-  if ( c1 && c3 )
-    return 1;
-  if ( c2 && c3 )
-    return 1;
-  return 0;
-  */
-  
-  tmp = c1;
-  c1 &= c2;
-  c2 &= c3;
-  c3 &= tmp;
-  c1 |= c2;
-  c1 |= c3;
-  return c1 & 1;
-}
-
-
-uint8_t u8g_pb_IsXIntersection(u8g_pb_t *b, u8g_uint_t v0, u8g_uint_t v1)
-{
-  uint8_t /*c0, c1, */ c2, c3;
-  /*
-    conditions: b->p.page_y0 < b->p.page_y1
-    there are no restriction on v0 and v1. If v0 > v1, then warp around unsigned is assumed
-  */
-  /*
-  c0 = v0 < 0;
-  c1 = v1 < 0;
-  */
-  c2 = v0 > b->width;
-  c3 = v1 > b->width;
-  /*if ( c0 && c1 ) return 0;*/
-  if ( c2 && c3 ) return 0;
-  /*if ( c1 && c2 ) return 0;*/
-  return 1;
-}
-
-uint8_t u8g_pb_IsIntersection(u8g_pb_t *pb, u8g_dev_arg_bbx_t *bbx)
-{
-  u8g_uint_t tmp;
-
-  tmp = bbx->y;
-  tmp += bbx->h;
-  tmp--;
-  
-  if ( u8g_pb_IsYIntersection(pb, bbx->y, tmp) == 0 )
-    return 0;
-  
-  /* maybe this one can be skiped... probability is very high to have an intersection, so it would be ok to always return 1 */
-  tmp = bbx->x;
-  tmp += bbx->w;
-  tmp--;
-    
-  return u8g_pb_IsXIntersection(pb, bbx->x, tmp);
-}
-
-void u8g_pb_GetPageBox(u8g_pb_t *pb, u8g_box_t *box)
-{
-  box->x0 = 0;
-  box->y0 = pb->p.page_y0;
-  box->x1 = pb->width;
-  box->x1--;
-  box->y1 = pb->p.page_y1;
-}
-
-
-uint8_t u8g_pb_Is8PixelVisible(u8g_pb_t *b, u8g_dev_arg_pixel_t *arg_pixel)
-{
-  u8g_uint_t v0, v1;
-  v0 = arg_pixel->y;
-  v1 = v0;
-  switch( arg_pixel->dir )
-  {
-    case 0:
-      break;
-    case 1:  
-      v1 += 8;          /* this is independent from the page height */
-      break;
-    case 2:  
-      break;
-    case 3: 
-      v0 -= 8;
-      break;
-  }
-  return u8g_pb_IsYIntersection(b, v0, v1);
-}
-
-
-
-uint8_t u8g_pb_WriteBuffer(u8g_pb_t *b, u8g_t *u8g, u8g_dev_t *dev)
-{
-  return u8g_WriteSequence(u8g, dev, b->width, b->buf);  
-}
-