diff --git a/bin/Model/Microcontroller/ALU.class b/bin/Model/Microcontroller/ALU.class
new file mode 100644
index 0000000..bee62df
Binary files /dev/null and b/bin/Model/Microcontroller/ALU.class differ
diff --git a/bin/Model/Microcontroller/PIC.class b/bin/Model/Microcontroller/PIC.class
index 5114ab1..286085d 100644
Binary files a/bin/Model/Microcontroller/PIC.class and b/bin/Model/Microcontroller/PIC.class differ
diff --git a/src/Model/Microcontroller/ALU.java b/src/Model/Microcontroller/ALU.java
new file mode 100644
index 0000000..9947e55
--- /dev/null
+++ b/src/Model/Microcontroller/ALU.java
@@ -0,0 +1,126 @@
+package Model.Microcontroller;
+
+public class ALU {
+    private boolean bCarryFlag = false;
+    private boolean bDigitCarryFlag = false;
+    private boolean bZeroFlag = false;
+
+    /**
+     * 
+     * @param bI1 input 1 bit (x)
+     * @param bI2 input 2 bit (y)
+     * @param bOB overflow bit (c in)
+     * @return [0] output (s), [1] overflow output (c out)
+     * @source https://de.wikipedia.org/wiki/Volladdierer#/media/Datei:Volladdierer_Aufbau_DIN40900.svg
+     */
+    private boolean[] fullAdder(boolean bI1, boolean bI2, boolean bOB) {
+        boolean[] abOutput = new boolean[2];
+
+        abOutput[0] = ((bI1 ^ bI2) ^ bOB);
+        abOutput[1] = ((bI1 & bI2) | ((bI1 ^ bI2) & bOB));
+
+        return abOutput;
+    }
+
+    /**
+     * 
+     * @param iValue1
+     * @param iWRegister
+     * @param bSubtractionBit
+     * @return
+     */
+    public int calcValue(int iValue1, int iWRegister, boolean bSubtractionBit) {
+        //Array with booleans which represent the value of value 1 that will be used for calculation
+        boolean[] abValue1 = new boolean[8];
+        abValue1[0] = ((iValue1 & 0b1) == 0b1);
+        abValue1[1] = ((iValue1 & 0b10) == 0b10);
+        abValue1[2] = ((iValue1 & 0b100) == 0b100);
+        abValue1[3] = ((iValue1 & 0b1000) == 0b1000);
+        abValue1[4] = ((iValue1 & 0b10000) == 0b10000);
+        abValue1[5] = ((iValue1 & 0b100000) == 0b100000);
+        abValue1[6] = ((iValue1 & 0b1000000) == 0b1000000);
+        abValue1[7] = ((iValue1 & 0b10000000) == 0b10000000);
+
+        //Change boolean to integer
+        int iSubtractionBitAsInt = bSubtractionBit ? 1 : 0;
+
+        //XOR WRegister-value with subtraction-bit
+        int iWRegisterXorSB = iWRegister ^ (0b11111111 * iSubtractionBitAsInt);
+
+        //Boolean array which represents the value of the XOR-ed wregister
+        boolean[] abValue2 = new boolean[8];
+        abValue2[0] = ((iWRegisterXorSB & 0b1) == 0b1);
+        abValue2[1] = ((iWRegisterXorSB & 0b10) == 0b10);
+        abValue2[2] = ((iWRegisterXorSB & 0b100) == 0b100);
+        abValue2[3] = ((iWRegisterXorSB & 0b1000) == 0b1000);
+        abValue2[4] = ((iWRegisterXorSB & 0b10000) == 0b10000);
+        abValue2[5] = ((iWRegisterXorSB & 0b100000) == 0b100000);
+        abValue2[6] = ((iWRegisterXorSB & 0b1000000) == 0b1000000);
+        abValue2[7] = ((iWRegisterXorSB & 0b10000000) == 0b10000000);
+
+        //Boolean array which represents the value of the outcome
+        boolean[] abOutcome = new boolean[8];
+
+        //Calculate outcome with fulladder
+        boolean[] abVals = fullAdder(abValue1[0], abValue2[0], bSubtractionBit);
+        abOutcome[0] = abVals[0];
+
+        abVals = fullAdder(abValue1[1], abValue2[1], abVals[1]);
+        abOutcome[1] = abVals[0];
+
+        abVals = fullAdder(abValue1[2], abValue2[2], abVals[1]);
+        abOutcome[2] = abVals[0];
+
+        abVals = fullAdder(abValue1[3], abValue2[3], abVals[1]);
+        abOutcome[3] = abVals[0];
+
+        //Set digitcarry if overflow of lower four bits appers
+        bDigitCarryFlag = abVals[1];
+
+        abVals = fullAdder(abValue1[4], abValue2[4], abVals[1]);
+        abOutcome[4] = abVals[0];
+
+        abVals = fullAdder(abValue1[5], abValue2[5], abVals[1]);
+        abOutcome[5] = abVals[0];
+
+        abVals = fullAdder(abValue1[6], abValue2[6], abVals[1]);
+        abOutcome[6] = abVals[0];
+
+        abVals = fullAdder(abValue1[7], abValue2[7], abVals[1]);
+        abOutcome[7] = abVals[0];
+
+        //Set carry if overflow of higher four bits appears
+        bCarryFlag = abVals[1];
+
+        //Calculate outcome as int
+        int iOutcome = (0b1 * (abOutcome[0] ? 1 : 0))
+                     + (0b10 * (abOutcome[1] ? 1 : 0))
+                     + (0b100 * (abOutcome[2] ? 1 : 0))
+                     + (0b1000 * (abOutcome[3] ? 1 : 0))
+                     + (0b10000 * (abOutcome[4] ? 1 : 0))
+                     + (0b100000 * (abOutcome[5] ? 1 : 0))
+                     + (0b1000000 * (abOutcome[6] ? 1 : 0))
+                     + (0b10000000 * (abOutcome[7] ? 1 : 0));
+
+        //Check whether outcome is zero or not and set/reset zeroflag
+        if (iOutcome > 0) {
+            bZeroFlag = false;
+        } else {
+            bZeroFlag = true;
+        }
+
+        return iOutcome;
+    }
+
+    public boolean getCarryFlag() {
+        return bCarryFlag;
+    }
+
+    public boolean getDigitCarryFlag() {
+        return bDigitCarryFlag;
+    }
+
+    public boolean getZeroFlag() {
+        return bZeroFlag;
+    }
+}
\ No newline at end of file
diff --git a/src/Model/Microcontroller/PIC.java b/src/Model/Microcontroller/PIC.java
index c05ca73..82158cf 100755
--- a/src/Model/Microcontroller/PIC.java
+++ b/src/Model/Microcontroller/PIC.java
@@ -18,6 +18,7 @@ public class PIC {
     private STACK Stack;
     private int WRegister;
     private RUNTIMER Runtimer;
+    private ALU ArithmeticLogicUnit;
 
     public PIC() {
         //Initialising objects of PIC.
@@ -26,6 +27,7 @@ public class PIC {
         Stack = new STACK();
         Runtimer = new RUNTIMER(Ram);
         WRegister = 0;
+        ArithmeticLogicUnit = new ALU();
     }
 
     public synchronized void resetPIC() {
@@ -1326,7 +1328,8 @@ public class PIC {
         int carry = (result & 0b100000000) >> 8;
 
         //The lower four bits are bitwise and with 1111b (15d).
-        int dcResult = (regFileAddrValue & 0x0F) + (wRegValue & 0x0F) + 1; //TODO LST File 3 DC Carry is not set.
+        System.out.println("regFileAddrValue: " + (regFileAddrValue & 0b1111) + " wRegValue: " + (wRegValue & 0b1111));
+        int dcResult = (regFileAddrValue & 0b1111) + (wRegValue & 0b1111); //TODO LST File 3 DC Carry is not set.
 
         //If the result is greater than 15, DC-Flag is set true.
         if (dcResult > 15) {