added a new ToString method to Word, DWord, and QWord classes.

The ToString method will concatenate the string representations of the high and low words (or dwords) to create a single string representation of the entire word.
This can be used to more easily write and read the value from the MC and CU classes.

CU.cs

@@ -2,10 +2,12 @@ namespace CPUSimulation
 {
     public class CU // Control Unit
     {
+        int numberOfRegisters = 16;
         Dictionary<string, string> _instructionSet;
         Dictionary<string, Word> _registers;
         public CU(int numberOfMemoryBanks)
         {
+
             _instructionSet = new Dictionary<string, string>();
             _instructionSet.Add("00000", "NOP");
             _instructionSet.Add("00001", "LOAD");
@@ -25,9 +27,11 @@ namespace CPUSimulation
             _instructionSet.Add("01111", "DEC");
 
             _registers = new Dictionary<string, Word>();
-            for (int i = 0; i < numberOfMemoryBanks; i++)
-            {
-                _registers.Add($"R{i}", new Word(new Byte[0]));
+            Word zeroWord = new Word(new Byte[2] { new Byte("00000000"), new Byte("00000000") });
+            for (int i = 0; i < numberOfRegisters; i++)
+            {   
+                string registerName = ((byte)i).ToString().Substring(4, 4);
+                _registers.Add(registerName, zeroWord);
             }
 
         }
@@ -43,13 +47,13 @@ namespace CPUSimulation
             {
                 _value++;
             }
-            public void SetValue(Int16 value)
+            public void SetValue(string value)
             {
-                _value = value;
+                _value = Convert.ToInt16(value, 2);
             }
-            public Int16 GetValue()
+            public string GetValue()
             {
-                return _value;
+                return Utils.Int16ToBinaryString(_value);
             }
         }
     }