diff --git a/PT6302.c b/PT6302.c
index 4551d9e..598362f 100644
--- a/PT6302.c
+++ b/PT6302.c
@@ -72,3 +72,49 @@ void set_digits (uint8_t digit_count)
   const uint8_t command = 0x60 | digit_count;
   transmit_bytes (&command, 1);
 }
+
+void set_ADRAM (const uint8_t address, const uint8_t *data, uint8_t size)
+{
+  if (address > DISPLAY_DIGITS)
+    return;
+  if (address + size > DISPLAY_DIGITS)
+    size = DISPLAY_DIGITS - address;
+  uint8_t payload[++size];
+  payload[0] = ADRAM | address;
+  for (int i = 1; i < size; ++i)
+    {
+      payload[i] = data[i - 1];
+    }
+  transmit_bytes (payload, size);
+}
+
+void set_CGRAM (const uint8_t address, const uint8_t *data, uint8_t size)
+{
+  if (address > 0x08)
+    return;
+  if (address + size > 0x08)
+    size = 0x08 - address;
+  size = size * 5 + 1;
+  uint8_t payload[size];
+  payload[0] = CGRAM | address;
+  for (int i = 1; i < size; ++i)
+    {
+      payload[i] = *(data + i - 1);
+    }
+  transmit_bytes (payload, size);
+}
+
+void set_DCRAM (const uint8_t address, const uint8_t *cg_address, uint8_t size)
+{
+  if (address > DISPLAY_DIGITS)
+    return;
+  if (address + size > DISPLAY_DIGITS)
+    size = DISPLAY_DIGITS - address;
+  uint8_t payload[++size];
+  payload[0] = DCRAM | address;
+  for (int i = 1; i < size; ++i)
+    {
+      payload[i] = cg_address[i - 1];
+    }
+  transmit_bytes (payload, size);
+}
\ No newline at end of file
diff --git a/PT6302.h b/PT6302.h
index 3a06842..6ada14b 100644
--- a/PT6302.h
+++ b/PT6302.h
@@ -5,6 +5,8 @@
 #ifndef _PT6302_H_
 #define _PT6302_H_
 
+#define DISPLAY_DIGITS 12
+
 /* PT6302 timing constants, all in usec */
 static const uint8_t TCW = 1;     //CLKB pulse width
 static const uint8_t TDOFF = 16;  //Data processing time
@@ -19,6 +21,12 @@ enum pins {
   DINpin = (1 << PB7),
 };
 
+enum RAM_types{
+  DCRAM = 0x10,
+  CGRAM = 0x20,
+  ADRAM = 0x30,
+};
+
 /* -------------------------------------------------------------
  * Initial setup for the VFD controller interface
  * Sets up the connected pins and leaves them in inactive state.
@@ -52,4 +60,36 @@ void set_digits(uint8_t digit_count);
  * ----------------------------------------------------------- */
 void set_duty (uint8_t brightness);
 
+/* ------------------------------------------------------------------------------------------
+ * Set the content of the DCRAM - this will display a character from the CGROM/RAM at address
+ * cd_address is an array of the CGROM/RAM addresses of characters to display
+ * size is the number of characters to display (max DISPLAY_DIGITS - address)
+ *  if exceeded, max possible number of characters will be displayed
+ * address is the starting address (4 bits, max DISPLAY_DIGITS)
+ *  if DISPLAY_DIGITS is exceeded, no characters will be set
+ * Handles the entire communication
+ * ------------------------------------------------------------------------------------------ */
+void set_DCRAM(uint8_t address, const uint8_t* cg_address, uint8_t size);
+
+/* -------------------------------------------------------------------------------
+ * Set the content of the CGRAM - this will write custom characters into the CGRAM
+ * data is an array of 5-byte arrays that contain the custom character data
+ * size is the number of 5-byte arrays
+ * address is the starting address (3 bits)
+ * Handles the entire communication
+ * ------------------------------------------------------------------------------- */
+void set_CGRAM (uint8_t address, const uint8_t *data, uint8_t size);
+
+/* ---------------------------------------------------------------------------------------
+ * Set the content of the ADRAM - This will cause the corresponding segments to be set
+ * data is an array containing sequential data of the segments (one byte for two segments)
+ *  elements of the array are truncated after two bits
+ * size is the number of segment pairs to be changed (max DISPLAY_DIGITS pairs - address)
+ *  if exceeded, max possible number of segment pairs will be set
+ * address is the starting address (4 bits, max DISPLAY_DIGITS)
+ *  if DISPLAY_DIGITS is exceeded, no segment pairs will be set
+ * Handles the entire communication
+ * --------------------------------------------------------------------------------------- */
+void set_ADRAM(uint8_t address, const uint8_t* data, uint8_t size);
+
 #endif //_PT6302_H_
diff --git a/main.c b/main.c
index 578c4aa..9fb229f 100644
--- a/main.c
+++ b/main.c
@@ -1,4 +1,6 @@
 #define F_CPU 8000000UL
+#define DISPLAY_DIGITS 12
+
 #include <avr/io.h>
 #include <util/delay.h>
 #include "PT6302.h"
@@ -10,12 +12,23 @@ static const uint8_t lightoff = 0x71;
 
 int main ()
 {
+  static const uint8_t digitstates[] =
+    {0b11, 0b11, 0b11, 0b11, 0b11, 0b11, 0b11, 0b11, 0b11, 0b11, 0b11, 0b11};
+  static const uint8_t custom_chars[8*5] = {0};
+  static const uint8_t characters[] =
+    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
   PT6302_startup ();
   set_ports (1, 1);
   set_digits (12);
   set_duty (7);
+  set_ADRAM (0, digitstates, DISPLAY_DIGITS);
+  set_CGRAM (0,custom_chars, 8);
+  set_DCRAM (0, characters, DISPLAY_DIGITS);
   while (1)
     {
-
+      transmit_bytes (&lighton, 1);
+      _delay_us (1000);
+      transmit_bytes (&lightoff, 1);
+      _delay_us (1000);
     }
 }