diff --git a/lib/font.c b/lib/font.c
index 481b927..1f93ebd 100644
--- a/lib/font.c
+++ b/lib/font.c
@@ -16,7 +16,7 @@
 #include "font.h"
 
 /** @array Charset */
-const uint8_t FONTS[][5] PROGMEM = {
+const uint8_t FONTS[][CHARS_COLS_LENGTH] PROGMEM = {
   { 0x00, 0x00, 0x00, 0x00, 0x00 }, // 20 space
   { 0x81, 0x81, 0x18, 0x81, 0x81 }, // 21 !
   { 0x00, 0x07, 0x00, 0x07, 0x00 }, // 22 "
diff --git a/lib/ssd1306.c b/lib/ssd1306.c
index bd814a1..3eadf4a 100644
--- a/lib/ssd1306.c
+++ b/lib/ssd1306.c
@@ -9,12 +9,13 @@
  * @datum       06.10.2020
  * @update      19.07.2021
  * @file        ssd1306.c
+ * @version     2.0
  * @tested      AVR Atmega328
  *
  * @depend      font.h, twi.h
  * ---------------------------------------------------------------+
  * @descr       Version 1.0 -> applicable for 1 display
- *              Version 2.0 -> applicable for more than 1 display
+ *              Version 2.0 -> rebuild to 'cacheMemLcd' array
  * ---------------------------------------------------------------+
  * @usage       Basic Setup for OLED Display
  */
@@ -159,10 +160,6 @@ static char cacheMemLcd[CACHE_SIZE_MEM];
 
 // @var global -  set area
 unsigned int set_area = (END_PAGE_ADDR - START_PAGE_ADDR + 1) * (END_COLUMN_ADDR - START_COLUMN_ADDR + 1);
-// @var global - cache index column
-unsigned short int indexCol = START_COLUMN_ADDR;
-// @var global - cache index page
-unsigned short int indexPage = START_PAGE_ADDR;
 
 /**
  * @desc    SSD1306 Init
@@ -274,7 +271,7 @@ uint8_t SSD1306_Send_StartAndSLAW (uint8_t address)
 /**
  * @desc    SSD1306 Send command
  *
- * @param   uint8_t
+ * @param   uint8_t command
  *
  * @return  uint8_t
  */
@@ -306,7 +303,7 @@ uint8_t SSD1306_Send_Command (uint8_t command)
 }
 
 /**
- * @desc    SSD1306 Normal Colors
+ * @desc    SSD1306 Normal colors
  *
  * @param   uint8_t address
  *
@@ -340,7 +337,7 @@ uint8_t SSD1306_NormalScreen (uint8_t address)
 }
 
 /**
- * @desc    SSD1306 Inverse Colors
+ * @desc    SSD1306 Inverse colors
  *
  * @param   uint8_t address
  *
@@ -374,7 +371,7 @@ uint8_t SSD1306_InverseScreen (uint8_t address)
 }
 
 /**
- * @desc    SSD1306 Update Screen On
+ * @desc    SSD1306 Update screen
  *
  * @param   uint8_t address
  *
@@ -429,294 +426,56 @@ uint8_t SSD1306_UpdateScreen (uint8_t address)
 /**
  * @desc    SSD1306 Send Command
  *
- * @param   uint8_t address
+ * @param   void
  *
  * @return  void
  */
-void SSD1306_ClearScreen (uint8_t address)
+void SSD1306_ClearScreen (void)
 {
-  // init status
-  uint8_t status = INIT_STATUS;
-  //short int i = 0;
-
   // null cache memory lcd
   memset (cacheMemLcd, 0x00, CACHE_SIZE_MEM);
-/*
-  // update - null col, increment page
-  status = SSD1306_SetPosition (address, 0, 0);
-  // request
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // TWI: start & SLAW
-  // -------------------------
-  status = SSD1306_Send_StartAndSLAW (address);
-  // request - start TWI
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // control byte data stream
-  // -------------------------    
-  status = TWI_MT_Send_Data (SSD1306_DATA_STREAM);
-  // request - start TWI
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // erase whole area
-  // -------------------------
-  while (i < set_area) {
-    // send null data
-    status = TWI_MT_Send_Data (0x00);
-    // request - start TWI
-    if (SSD1306_SUCCESS != status) {
-      // error
-      return status;
-    }
-    // increment
-    i++;
-  }
-
-  // stop TWI
-  TWI_Stop ();
-*/
-  // success
-  return SSD1306_SUCCESS;  
 }
 
 /**
- * @desc    SSD1306 Set Poisition
+ * @desc    SSD1306 Set position
  *
- * @param   uint8_t address
- * @param   uint8_t
- * @param   uint8_t
+ * @param   uint8_t column -> 0 ... 127 
+ * @param   uint8_t page -> 0 ... 7
  *
- * @return  uint8_t
+ * @return  void
  */
-uint8_t SSD1306_SetPosition (uint8_t address, uint8_t x, uint8_t y) 
+void SSD1306_SetPosition (uint8_t x, uint8_t y) 
 {
-  // variables
-  uint8_t status = INIT_STATUS;
-
-  // TWI: start & SLAW
-  // -------------------------
-  status = SSD1306_Send_StartAndSLAW (address);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // SET COLUMN address 
-  // ***************************************************
-  // set column addr
-  // -------------------------    
-  status = SSD1306_Send_Command (SSD1306_SET_COLUMN_ADDR);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // start COLUMN
-  // -------------------------    
-  status = SSD1306_Send_Command (x);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // end COLUMN
-  // -------------------------    
-  status = SSD1306_Send_Command (END_COLUMN_ADDR);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // update column index
-  indexCol = x;
-
-  // SET PAGE address 
-  // ***************************************************
-  // set page addr
-  // -------------------------    
-  status = SSD1306_Send_Command (SSD1306_SET_PAGE_ADDR);
-  // request - start TWI
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // start PAGE
-  // -------------------------    
-  status = SSD1306_Send_Command (y);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // end PAGE
-  // -------------------------    
-  status = SSD1306_Send_Command (END_PAGE_ADDR);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // update column index
-  indexPage = y;
-
-  // stop TWI
-  TWI_Stop ();
-
-  // success
-  return SSD1306_SUCCESS;
+  // counter
+  _counter = x + (y << 7);
 }
 
 /**
  * @desc    SSD1306 Check Text Poisition
  *
- * @param   uint8_t address
+ * @param   void
  *
  * @return  uint8_t
  */
-uint8_t SSD1306_UpdTxtPosition (uint8_t address) 
+uint8_t SSD1306_UpdTxtPosition (void) 
 {
-  // init status
-  uint8_t status = INIT_STATUS;
   // check end column position
-  unsigned short int x = indexCol + CHARS_COLS_LENGTH + 1;
+  uint8_t y = _counter >> 7;
+  uint8_t x = _counter - (y << 7);
+  uint8_t x_new = x + CHARS_COLS_LENGTH + 1;
+
   // check position
-  if ((x > END_COLUMN_ADDR) && (indexPage > (END_PAGE_ADDR - 1))) {
-    // return out of range
-    return SSD1306_ERROR;
-  // if x out reach end but page in range
-  } else if ((x > END_COLUMN_ADDR) && (indexPage < END_PAGE_ADDR)) {
-    // update - column
-    indexCol = 0;
-    // update - page
-    indexPage = indexPage + 1;
-    // update - null col, increment page
-    status = SSD1306_SetPosition (address, indexCol, indexPage);
-    // request
-    if (SSD1306_SUCCESS != status) {
-      // error
-      return status;
-    }
-  } 
-  // success
-  return SSD1306_SUCCESS;
-}
-
-/**
- * @desc    Send 1 Byte of data
- *
- * @param   uint8_t address
- * @param   uint8_t data
- *
- * @return  void
- */
-uint8_t SSD1306_SendByte (uint8_t address, uint8_t data)
-{
-  // init status
-  uint8_t status = INIT_STATUS;
-
-  // TWI: start & SLAW
-  // -------------------------
-  status = SSD1306_Send_StartAndSLAW (address);
-  // request - start TWI
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // control byte data stream
-  // -------------------------    
-  status = TWI_MT_Send_Data (SSD1306_DATA_STREAM);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // send byte of data
-  // -------------------------    
-  status = TWI_MT_Send_Data (data);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // increment global index col
-  indexCol = indexCol + 1;
-
-  // stop TWI
-  TWI_Stop ();
-
-  // success
-  return SSD1306_SUCCESS;
-}
-
-/**
- * @desc    Send same bytes
- *
- * @param   uint8_t address
- * @param   uint8_t data
- * @param   uint8_t length
- *
- * @return  void
- */
-uint8_t SSD1306_SendSameBytes (uint8_t address, uint8_t data, uint8_t length)
-{
-  // index
-  unsigned short int i = 0;
-  // init status
-  uint8_t status = INIT_STATUS;
-
-  // TWI: start & SLAW
-  // -------------------------
-  status = SSD1306_Send_StartAndSLAW (address);
-  // request - start TWI
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // control byte data stream
-  // -------------------------    
-  status = TWI_MT_Send_Data (SSD1306_DATA_STREAM);
-  // request - start TWI
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // loop through data
-  while (i++ < length) {
-    // draw line only within 1 page
-    if (indexCol < MAX_X) {
-      // send byte of data
-      // -------------------------    
-      status = TWI_MT_Send_Data (data);
-      // request - start TWI
-      if (SSD1306_SUCCESS != status) {
-        // error
-        return status;
-      }
-      // increment global index col
-      indexCol = indexCol + 1;
-    } else {
-      // end loop
-      break;
+  if (x_new > END_COLUMN_ADDR) {
+    // if more than numbre of pages
+    if (y > END_PAGE_ADDR) {
+      // return out of range
+      return SSD1306_ERROR;
+    // if x out reach end but page in range
+    } else if (y < (END_PAGE_ADDR-1)) {
+      // update
+      _counter = ((++y) << 7);
     }
   }
-
-  // stop TWI
-  TWI_Stop ();
-
   // success
   return SSD1306_SUCCESS;
 }
@@ -724,70 +483,29 @@ uint8_t SSD1306_SendSameBytes (uint8_t address, uint8_t data, uint8_t length)
 /**
  * @desc    Draw character
  *
- * @param   uint8_t address
  * @param   char character
  *
  * @return  uint8_t
  */
-uint8_t SSD1306_DrawChar (uint8_t address, char character)
+uint8_t SSD1306_DrawChar (char character)
 {
   // variables
-  uint8_t idxCol = 0;
-  // init status
-  uint8_t status = INIT_STATUS;
+  uint8_t i = 0;
 
   // update text position
-  if (SSD1306_UpdTxtPosition (address) != SSD1306_SUCCESS) {
+  if (SSD1306_UpdTxtPosition () == SSD1306_ERROR) {
     // error
     return SSD1306_ERROR;
   }
 
-  // TWI: start & SLAW
-  // -------------------------
-  status = SSD1306_Send_StartAndSLAW (address);
-  // request - start TWI
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // control byte data stream
-  // -------------------------    
-  status = TWI_MT_Send_Data (SSD1306_DATA_STREAM);
-  // request - start TWI
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
   // loop through 5 bits
-  while (idxCol < CHARS_COLS_LENGTH) {
-    // send control byte data
-    // -------------------------    
-    status = TWI_MT_Send_Data (pgm_read_byte(&FONTS[character-32][idxCol]));
-    // request - start TWI
-    if (SSD1306_SUCCESS != status) {
-      // error
-      return status;
-    }
-    // increment
-    idxCol++;
+  while (i < CHARS_COLS_LENGTH) {
+    // read byte 
+    cacheMemLcd[_counter++] = pgm_read_byte(&FONTS[character-32][i++]);
   }
 
-  // empty column
-  // -------------------------    
-  status = TWI_MT_Send_Data (CLEAR_COLOR);
-  // request - start TWI
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // increment global index col
-  indexCol = indexCol + CHARS_COLS_LENGTH + 1;
-
-  // stop TWI
-  TWI_Stop ();
+  // update position
+  _counter++;
 
   // success
   return SSD1306_SUCCESS;
@@ -796,46 +514,31 @@ uint8_t SSD1306_DrawChar (uint8_t address, char character)
 /**
  * @desc    SSD1306 Draw String
  *
- * @param   uint8_t address
  * @param   char * string
  *
  * @return  void
  */
-uint8_t SSD1306_DrawString (uint8_t address, char *str)
+void SSD1306_DrawString (char *str)
 {
-  // init status
-  uint8_t status = INIT_STATUS;
   // init
   int i = 0;
-
   // loop through character of string
   while (str[i] != '\0') {
     // draw string
-    status = SSD1306_DrawChar (address, str[i++]);
-    // request - start TWI
-    if (SSD1306_SUCCESS != status) {
-      // error
-      return status;
-    }
+    SSD1306_DrawChar (str[i++]);
   }
-
-  // success
-  return SSD1306_SUCCESS;
 }
 
 /**
  * @desc    Draw pixel
  *
- * @param   uint8_t
- * @param   uint8_t
- * @param   uint8_t
+ * @param   uint8_t x -> 0 ... MAX_X
+ * @param   uint8_t y -> 0 ... MAX_Y
  *
- * @return  void
+ * @return  uint8_t
  */
-uint8_t SSD1306_DrawPixel (uint8_t address, uint8_t x, uint8_t y)
+uint8_t SSD1306_DrawPixel (uint8_t x, uint8_t y)
 {
-  // variables
-  uint8_t status = INIT_STATUS;
   uint8_t page = 0;
   uint8_t pixel = 0;
 
@@ -848,96 +551,10 @@ uint8_t SSD1306_DrawPixel (uint8_t address, uint8_t x, uint8_t y)
   page = y >> 3;
   // which pixel (y % 8)
   pixel = 1 << (y - (page << 3));
-
-  // TWI: start & SLAW
-  // -------------------------
-  status = SSD1306_Send_StartAndSLAW (address);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // SET COLUMN address 
-  // ***************************************************
-  // set column addr
-  // -------------------------    
-  status = SSD1306_Send_Command (SSD1306_SET_COLUMN_ADDR);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // start COLUMN
-  // -------------------------    
-  status = SSD1306_Send_Command (x);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // end COLUMN
-  // -------------------------    
-  status = SSD1306_Send_Command (END_COLUMN_ADDR);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // update column index
-  indexCol = x;
-
-  // SET PAGE address 
-  // ***************************************************
-  // set page addr
-  // -------------------------    
-  status = SSD1306_Send_Command (SSD1306_SET_PAGE_ADDR);
-  // request - start TWI
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // start PAGE
-  // -------------------------    
-  status = SSD1306_Send_Command (page);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // end PAGE
-  // -------------------------    
-  status = SSD1306_Send_Command (END_PAGE_ADDR);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // update column index
-  indexPage = y;
-
-  // ------------------------------------------------------
-  // control byte data stream
-  status = TWI_MT_Send_Data (SSD1306_DATA_STREAM);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-  // send byte of data
-  status = TWI_MT_Send_Data (pixel);
-  // request success
-  if (SSD1306_SUCCESS != status) {
-    // error
-    return status;
-  }
-
-  // increment global index col
-  indexCol = indexCol + 1;
-  // ------------------------------------------------------
-
-  // stop TWI
-  TWI_Stop ();
+  // update counter
+  _counter = x + (page << 7);
+  // save pixel
+  cacheMemLcd[_counter++] |= pixel;
 
   // success
   return SSD1306_SUCCESS;
@@ -947,7 +564,6 @@ uint8_t SSD1306_DrawPixel (uint8_t address, uint8_t x, uint8_t y)
  * @desc    Draw line by Bresenham algoritm
  * @surce   https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
  *  
- * @param   uint8_t address
  * @param   uint8_t x start position / 0 <= cols <= MAX_X-1
  * @param   uint8_t x end position   / 0 <= cols <= MAX_X-1
  * @param   uint8_t y start position / 0 <= rows <= MAX_Y-1 
@@ -955,7 +571,7 @@ uint8_t SSD1306_DrawPixel (uint8_t address, uint8_t x, uint8_t y)
  *
  * @return  uint8_t
  */
-uint8_t SSD1306_DrawLine (uint8_t address, uint8_t x1, uint8_t x2, uint8_t y1, uint8_t y2)
+uint8_t SSD1306_DrawLine (uint8_t x1, uint8_t x2, uint8_t y1, uint8_t y2)
 {
   // determinant
   int16_t D;
@@ -990,7 +606,7 @@ uint8_t SSD1306_DrawLine (uint8_t address, uint8_t x1, uint8_t x2, uint8_t y1, u
     // calculate determinant
     D = (delta_y << 1) - delta_x;
     // draw first pixel
-    SSD1306_DrawPixel (address, x1, y1);
+    SSD1306_DrawPixel (x1, y1);
     // check if x1 equal x2
     while (x1 != x2) {
       // update x1
@@ -1005,14 +621,14 @@ uint8_t SSD1306_DrawLine (uint8_t address, uint8_t x1, uint8_t x2, uint8_t y1, u
       // update deteminant
       D += 2*delta_y;
       // draw next pixel
-      SSD1306_DrawPixel (address, x1, y1);
+      SSD1306_DrawPixel (x1, y1);
     }
   // for m > 1 (dy > dx)    
   } else {
     // calculate determinant
     D = delta_y - (delta_x << 1);
     // draw first pixel
-    SSD1306_DrawPixel (address, x1, y1);
+    SSD1306_DrawPixel (x1, y1);
     // check if y2 equal y1
     while (y1 != y2) {
       // update y1
@@ -1027,44 +643,9 @@ uint8_t SSD1306_DrawLine (uint8_t address, uint8_t x1, uint8_t x2, uint8_t y1, u
       // update deteminant
       D -= 2*delta_x;
       // draw next pixel
-      SSD1306_DrawPixel (address, x1, y1);
+      SSD1306_DrawPixel (x1, y1);
     }
   }
   // success return
   return SSD1306_SUCCESS;
 }
-
-/**
- * @desc    Draw horizontal line
- *
- * @param   uint8_t address
- * @param   uint8_t
- * @param   uint8_t
- * @param   uint8_t
- *
- * @return  void
- */
-uint8_t SSD1306_DrawLineHorizontal (uint8_t address, uint8_t x, uint8_t y, uint8_t len)
-{
-  uint8_t page = 0;
-  uint8_t pixel = 0;
-
-  // if out of range
-  if ((x > MAX_X) && (y > MAX_Y)) {
-    // out of range
-    return SSD1306_ERROR;
-  }
-  // find page (y / 8)
-  page = y >> 3;
-  // which pixel (y % 8)
-  pixel |= 1 << (y - (page << 3));
-
-  // send position
-  SSD1306_SetPosition (address, x, page);
-  // draw pixel
-  SSD1306_SendSameBytes (address, pixel, len);
-
-  // success
-  return SSD1306_SUCCESS;  
-}
-
diff --git a/lib/ssd1306.h b/lib/ssd1306.h
index 58dfb5c..b99bd72 100644
--- a/lib/ssd1306.h
+++ b/lib/ssd1306.h
@@ -9,12 +9,13 @@
  * @datum       06.10.2020
  * @update      19.07.2021
  * @file        ssd1306.h
+ * @version     2.0
  * @tested      AVR Atmega328
  *
  * @depend      font.h, twi.h
  * ---------------------------------------------------------------+
  * @descr       Version 1.0 -> applicable for 1 display
- *              Version 2.0 -> applicable for more than 1 display
+ *              Version 2.0 -> rebuild to 'cacheMemLcd' array
  * ---------------------------------------------------------------+
  * @usage       Basic Setup for OLED Display
  */
@@ -86,12 +87,11 @@
   #define MAX_X                     END_COLUMN_ADDR
   #define MAX_Y                     (END_PAGE_ADDR+1)*8
 
+
+  // @var set area
+  unsigned int _counter;
   // @var set area
   unsigned int set_area;
-  // @var cache index column
-  unsigned short int indexCol;
-  // @var cache index page
-  unsigned short int indexPage;
 
   /**
    * @desc    SSD1306 Init - set frequency
@@ -123,11 +123,11 @@
   /**
    * @desc    SSD1306 Clear Screen
    *
-   * @param   uint8_t
+   * @param   void
    *
-   * @return  uint8_t
+   * @return  void
    */
-  uint8_t SSD1306_ClearScreen (uint8_t);
+  void SSD1306_ClearScreen (void);
 
   /**
    * @desc    SSD1306 Normal Colors
@@ -148,47 +148,44 @@
   uint8_t SSD1306_InverseScreen (uint8_t);
 
   /**
-   * @desc    SSD1306 Check Text Position
+   * @desc    SSD1306 Update text position
    *
-   * @param   uint8_t
+   * @param   void
    *
    * @return  uint8_t
    */
-  uint8_t SSD1306_UpdTxtPosition (uint8_t);
+  uint8_t SSD1306_UpdTxtPosition (void);
 
   /**
-   * @desc    SSD1306 Set Position
+   * @desc    SSD1306 Set position
    *
    * @param   uint8_t
    * @param   uint8_t
-   * @param   uint8_t
    *
-   * @return  char
+   * @return  void
    */
-  uint8_t SSD1306_SetPosition (uint8_t, uint8_t, uint8_t);
+  void SSD1306_SetPosition (uint8_t, uint8_t);
 
   /**
-   * @desc    SSD1306 Draw Character
+   * @desc    SSD1306 Draw character
    *
-   * @param   uint8_t
    * @param   char
    *
    * @return  uint8_t
    */
-  uint8_t SSD1306_DrawChar (uint8_t, char);
+  uint8_t SSD1306_DrawChar (char);
 
   /**
-   * @desc    SSD1306 Draw String
+   * @desc    SSD1306 Draw string
    *
-   * @param   uint8_t
    * @param   char *
    *
-   * @return  uint8_t
+   * @return  void
    */
-  uint8_t SSD1306_DrawString (uint8_t, char *);
+  void SSD1306_DrawString (char *);
 
   /**
-   * @desc    SSD1306 Update Screen On
+   * @desc    SSD1306 Update screen
    *
    * @param   uint8_t
    *
@@ -210,11 +207,10 @@
    *
    * @param   uint8_t
    * @param   uint8_t
-   * @param   uint8_t
    *
-   * @return  void
+   * @return  uint8_t
    */
-  uint8_t SSD1306_DrawPixel (uint8_t, uint8_t, uint8_t);
+  uint8_t SSD1306_DrawPixel (uint8_t, uint8_t);
 
   /**
    * @desc    Draw line
@@ -223,43 +219,9 @@
    * @param   uint8_t
    * @param   uint8_t
    * @param   uint8_t
-   * @param   uint8_t
    *
    * @return  uint8_t
    */
-  uint8_t SSD1306_DrawLine (uint8_t, uint8_t, uint8_t, uint8_t, uint8_t);
-
-  /**
-   * @desc    SSD1306 Draw line horizontal
-   *
-   * @param   uint8_t
-   * @param   uint8_t
-   * @param   uint8_t
-   * @param   uint8_t
-   *
-   * @return  void
-   */
-  uint8_t SSD1306_DrawLineHorizontal (uint8_t, uint8_t, uint8_t, uint8_t);
-
-  /**
-   * @desc    SSD1306 Send byte
-   *
-   * @param   uint8_t
-   * @param   uint8_t
-   *
-   * @return  void
-   */
-  uint8_t SSD1306_SendByte (uint8_t, uint8_t);
-
-  /**
-   * @desc    SSD1306 Send same bytes
-   *
-   * @param   uint8_t
-   * @param   uint8_t
-   * @param   uint8_t
-   *
-   * @return  uint8_t
-   */
-  uint8_t SSD1306_SendSameBytes (uint8_t, uint8_t, uint8_t);
+  uint8_t SSD1306_DrawLine (uint8_t, uint8_t, uint8_t, uint8_t);
 
 #endif
diff --git a/main.c b/main.c
index b99e3d1..ba54c9d 100644
--- a/main.c
+++ b/main.c
@@ -14,7 +14,7 @@
  * @depend      ssd1306.h
  * ---------------------------------------------------------------+
  * @descr       Version 1.0 -> applicable for 1 display
- *              Version 2.0 -> applicable for more than 1 display
+ *              Version 2.0 -> rebuild to 'cacheMemLcd' array
  * ---------------------------------------------------------------+
  */
 
@@ -37,29 +37,27 @@ int main(void)
   SSD1306_Init (addr);
 
   // clear screen
-  SSD1306_ClearScreen (addr);
+  SSD1306_ClearScreen ();
+  // clear screen
+  SSD1306_ClearScreen ();
   // draw line
-  //SSD1306_DrawLineHorizontal (addr, 4, 4, 115);
-  // set position x, y
-  //SSD1306_SetPosition (addr, 1, 1);
-
-  //for (char i = 1; i < MAX_Y; i++) {
-    SSD1306_DrawPixel (addr, 0, 0);
-    SSD1306_DrawPixel (addr, 0, 1);
-    SSD1306_DrawPixel (addr, 0, 2);
-    SSD1306_DrawPixel (addr, 1, 1);
-    SSD1306_DrawPixel (addr, 2, 2);
-    SSD1306_DrawPixel (addr, 3, 3);
-    SSD1306_DrawPixel (addr, 4, 4);
-    //SSD1306_DrawLine (addr, 0, MAX_X-1, MAX_Y-1, MAX_Y-1);
-  //}
-
+  SSD1306_DrawLine (0, MAX_X, 4, 4);
+  // set position
+  SSD1306_SetPosition (7, 1);
   // draw string
-  //SSD1306_DrawString (addr, "SSD1306 OLED DRIVER");
+  SSD1306_DrawString ("SSD1306 OLED DRIVER");
   // draw line
-  //SSD1306_DrawLineHorizontal (addr, 4, 18, 115);
+  SSD1306_DrawLine (0, MAX_X, 18, 18);
+  // set position
+  SSD1306_SetPosition (40, 3);
+  // draw string
+  SSD1306_DrawString ("MATIASUS");
+  // set position
+  SSD1306_SetPosition (53, 5);
+  // draw string
+  SSD1306_DrawString ("2021");
   // update
-  //SSD1306_UpdateScreen (addr);
+  SSD1306_UpdateScreen (addr);
 
   // return value
   return 0;
diff --git a/main.hex b/main.hex
index f117127..882e9bc 100644
--- a/main.hex
+++ b/main.hex
@@ -38,10 +38,10 @@
 :10025000000221007F02220007004001D30000A11C
 :1002600000C801DA1201817F00A400A601D5800137
 :10027000D9C201DB20018D1400AF11241FBECFEFC6
-:10028000D8E0DEBFCDBF11E0A0E0B1E0E6EEF8E0DF
-:1002900002C005900D92A230B107D9F725E0A2E087
-:1002A000B1E001C01D92A630B207E1F70E944504FB
-:1002B0000C9471040C94000083E08093B800E9EB87
+:10028000D8E0DEBFCDBF11E0A0E0B1E0EAEEF6E0DD
+:1002900002C005900D92A432B107D9F725E0A4E27F
+:1002A000B1E001C01D92A632B207E1F70E944203FD
+:1002B0000C9473030C94000083E08093B800E9EB86
 :1002C000F0E08081908182708160892B8083089525
 :1002D0008091B90087758093B90084EA8093BC004F
 :1002E0008091BC0087FFFCCF8091B900887F883067
@@ -68,78 +68,48 @@
 :10043000811103C086EA0C94D40108950E94C8017A
 :10044000811103C087EA0C94D4010895CF93DF9300
 :100450000E94C801811113C080E40E94990181119A
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-:1004A000D62FC42F0E94C80181112DC081E20E9465
-:1004B000D401811128C08D2F0E94D401811123C045
-:1004C0008FE70E94D40181111EC06D2F70E07093E0
-:1004D00005016093040182E20E94D401811113C0DE
-:1004E0008C2F0E94D40181110EC087E00E94D4019C
-:1004F000811109C04C2F50E0509303014093020139
-:100500000E94C40180E0DF91CF9108952091040101
-:10051000309105012A5F3F4F20383105A0F040910E
-:100520000201509103014730510578F41092050102
-:10053000109204014F5F5F4F5093030140930201FB
-:1005400060E00C944E0280E0089581E00895CF931E
-:10055000C62F0E94C801811116C080E40E94990133
-:10056000811111C08C2F0E94990181110CC08091C2
-:100570000401909105010196909305018093040177
-:100580000E94C40180E0CF910895FF920F931F93C2
-:10059000CF93DF93F62EC42F0E94C801811126C08D
-:1005A00080E40E949901811121C000E010E0D0E0B8
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-:1005C000910588F48F2D0E9499010F5F1F4F8111B3
-:1005D0000DC0809104019091050101969093050151
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 :00000001FF