diff --git a/d72042.ino b/d72042.ino
index b2275ca..8ee17f9 100644
--- a/d72042.ino
+++ b/d72042.ino
@@ -1,18 +1,12 @@
 #include <SPI.h>
 
-#define MODE 8
-#define CONTROL 9
-#define READ 0x08
-#define RESET 7
 
-#define DATASIZE 20
 
-char data[DATASIZE] = {0x0,};
-void iebus_init();
-byte inline bitchange(byte b)
-{
-  return b << 4;
-}
+
+#define iebusIRQ 2
+#define RAW 0x4
+#define isRAW (READFLG&RAW)
+#define isMARQ (READFLG&0x40)
 
 
 #define REG_WRITE_CTR bitchange(0x0)
@@ -37,6 +31,74 @@ byte inline bitchange(byte b)
 #define REG_READ_RBF (bitchange(0xe)|READ)
 
 
+#define LOW_ADDR 0x0
+#define HIGH_ADDR 0x36
+
+#define MODE 8
+#define CONTROL 9
+#define READ 0x08
+#define RESET 7
+
+#define DATASIZE 20
+
+
+
+
+
+void iebus_init();
+void flaginit();
+void iebus_transmission();
+void iebus_reception();
+void iebus_mastercomm();
+void iebus_slavetransmission();
+void iebus_command();
+int checkMARC();
+void iebus_irq();
+void iebus_loop();
+void dataWrite(char reg_addr, char *data, int datasize);
+int dataRead(char reg_addr, char *data);
+byte dataRead1byte(char addr);
+void dataWrite1byte(char addr , char data);
+
+byte READFLG;
+char data[DATASIZE] = {0x0,};
+
+
+///////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+struct _communicationFlag
+{
+  bool RAWF;
+  bool TRRQ;
+
+  byte I;
+  bool RERQ;
+  byte RECF;
+  byte SIZE;
+  byte PW;
+  byte PR;
+  byte J;
+  bool MCRQ;
+  bool SDRQ;
+  bool CORQ;
+  bool MTRQF;
+  bool MRRQF;
+  bool STRQF;
+  bool SLREF;
+  byte TRCF;
+} commFlag;
+
+
+byte inline bitchange(byte b)
+{
+  return b << 4;
+}
+
+
+
+
+///////////////////////////////////////////////////////////////////////////
+
 void setup (void) {
   Serial.begin(9600); //set baud rate to 115200 for usart
 
@@ -58,39 +120,9 @@ void setup (void) {
   iebus_init();
 }
 
-//      avclan.deviceAddress = 0x360;
-//      avclan.broadcast = AVC_MSG_NORMAL;
-//      avclan.masterAddress = 0x0360;
-//      avclan.slaveAddress  = 0x0140;
 
 
 
-#define LOW_ADDR 0x0
-#define HIGH_ADDR 0x36
-
-
-
-struct _communicationFlag
-{
-  bool RAWF;
-  bool TRRQ;
-  bool TRCF;
-  byte I;
-  bool RERQ;
-  byte RECF;
-  byte SIZE;
-  byte PW;
-  byte PR;
-  byte J;
-  bool MCRQ;
-  bool SDRQ;
-  bool CORQ;
-  bool MTRQF;
-  bool MRRQF;
-  bool STRQF;
-  bool SLREF;
-}commFlag;
-
 
 
 
@@ -106,6 +138,9 @@ void iebus_init()
   dataWrite1byte(REG_WRITE_CMR, B10000000); //CMR 100000 b1 b0
 
   flaginit();
+  pinMode(iebusIRQ, INPUT_PULLUP);
+
+  attachInterrupt(digitalPinToInterrupt(iebusIRQ), iebus_irq, RISING);
 }
 void flaginit()
 {
@@ -149,6 +184,83 @@ void iebus_command()
 {
 
 }
+
+
+int checkMARC()
+{
+  byte rcrdata = 0xf0 & dataRead1byte(REG_READ_RCR);
+  int  isResult = 0;
+  if (bitRead(rcrdata, 7) == 0 && bitRead(rcrdata, 6) == 0)
+  {
+    isResult = 1;
+  }
+  else if (bitRead(rcrdata, 7) == 0 && bitRead(rcrdata, 6) == 1 && bitRead(rcrdata, 5) == 0)
+  {
+    isResult = 2;
+  }
+  else if (bitRead(rcrdata, 7) == 0 && bitRead(rcrdata, 6) == 1 && bitRead(rcrdata, 5) == 1)
+  {
+    isResult = 3;
+  }
+  else
+  {
+    isResult = 0;
+  }
+
+  return isResult;
+}
+
+
+
+void iebus_irq()
+{
+  byte marcValue;
+  noInterrupts();
+  READFLG = dataRead1byte(REG_READ_FLG);
+  if (isRAW)
+  {
+    commFlag.RAWF = 1;
+  }
+  else
+  {
+    marcValue = checkMARC();
+    if ((commFlag.MTRQF == 1 && isMARQ == 0) || (commFlag.MRRQF == 1 && isMARQ == 0) || (marcValue > 0))
+    {
+      Serial.println("MARC");
+      if (marcValue == 1)
+      {
+        //00xx
+        commFlag.TRCF = marcValue>>4;
+        commFlag.TRRQ = 1;
+      }
+      else if (marcValue == 2)
+      {
+        //010x
+        commFlag.RERQ = 1;
+        commFlag.SIZE = dataRead1byte(REG_READ_RDR1);
+        commFlag.RECF = marcValue>>4;
+      }
+      else if (isMarc == 3)
+      {
+        //011x
+        commFlag.RERQ = 1;
+        commFlag.SIZE = dataRead1byte(REG_READ_RDR1);
+        commFlag.RECF = marcValue>>4;
+
+        //increment PW
+        commFlag.RERQ = 0;
+        commFlag.SIZE = 0;
+
+      }
+
+
+
+      //is Return code in slrc
+    }
+  }
+  interrupts();
+}
+
 void iebus_loop()
 {
   if (commFlag.RAWF == 1)