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.

CPU.cs

@@ -4,7 +4,7 @@ namespace CPUSimulation
 {
     public class CPU
     {
-        static int numberOfMemoryBanks = 4;
+        public static int numberOfMemoryBanks = 2;
         static int memoryBankSize = 1024;
         static MC _memoryController;
 
@@ -17,8 +17,8 @@ namespace CPUSimulation
             _memoryController.Write("0000000000000010","1111000000001111"); 
             for (int i = 0; i < 16; i++)
             {
-                Word dataRead = _memoryController.Read((Int16)i);
+                string dataRead = _memoryController.Read((Int16)i);
-                Console.WriteLine($"Data read from address {new Address((Int16)i).ToString()}: {dataRead.ToString()}");
+                Console.WriteLine($"Data read from address {new Address((Int16)i).ToString()}: {dataRead}");
             }
         }
 
@@ -27,8 +27,27 @@ namespace CPUSimulation
             _memoryController = new MC(numberOfMemoryBanks, memoryBankSize);
             for (int i = 0; i < memoryBankSize; i++)
             {
-                Word dataToWrite = Utils.GenerateRandomWord(numberOfMemoryBanks);
+                if (numberOfMemoryBanks == 2)
-                _memoryController.Write((Int16)i, dataToWrite);
+                {
+                    Word dataToWrite = Utils.GenerateRandomWord(numberOfMemoryBanks);
+                    _memoryController.Write(new Address((Int16)i).ToString(), dataToWrite.ToString());
+                }
+                else if (numberOfMemoryBanks == 4)
+                {
+                    DWord dataToWrite = new DWord(Utils.GenerateRandomWord(2), Utils.GenerateRandomWord(2));
+                    _memoryController.Write(new Address((Int16)i).ToString(), dataToWrite.ToString());
+                }
+                else if (numberOfMemoryBanks == 8)
+                {
+                    QWord dataToWrite = new QWord(new DWord(Utils.GenerateRandomWord(2), Utils.GenerateRandomWord(2)), new DWord(Utils.GenerateRandomWord(2), Utils.GenerateRandomWord(2)));
+                    _memoryController.Write(new Address((Int16)i).ToString(), dataToWrite.ToString());
+                }
+                else
+                {
+                    throw new ArgumentException($"Number of memory banks must be between 1 and 8 (inclusive).");
+                }
+                
+                
                 //Word dataRead = _memoryController.Read((Int16)i);
                 //Console.WriteLine($"Data read from address {new Address((Int16)i).ToString()}: {dataRead.ToString()}");
             }

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++)
+            Word zeroWord = new Word(new Byte[2] { new Byte("00000000"), new Byte("00000000") });
+            for (int i = 0; i < numberOfRegisters; i++)
             {   
-                _registers.Add($"R{i}", new Word(new Byte[0]));
+                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);
             }
         }
     }

MC.cs

@@ -27,7 +27,7 @@ namespace CPUSimulation
             }
         }
 
-        public Word Read(Int16 address)
+        public string Read(Int16 address)
         {
             AddressOkay(address);
             Byte[] byteData = new Byte[_numberOfMemoryBanks];
@@ -35,7 +35,22 @@ namespace CPUSimulation
             {
                 byteData[i] = _memoryBanks[i].Read(new Address(address).ToString());
             }
-            return new Word(byteData);
+            if (byteData.Length == 2)
+            {
+                return new Word(byteData).ToString();
+            }
+            else if (byteData.Length == 4)
+            {
+                return new DWord(new Word(byteData.Take(2).ToArray()), new Word(byteData.Skip(2).Take(2).ToArray())).ToString();
+            }
+            else if (byteData.Length == 8)
+            {
+                return new QWord(new DWord(new Word(byteData.Take(2).ToArray()), new Word(byteData.Skip(2).Take(2).ToArray())), new DWord(new Word(byteData.Skip(4).Take(2).ToArray()), new Word(byteData.Skip(6).Take(2).ToArray()))).ToString();
+            }
+            else
+            {
+                throw new ArgumentException($"Number of memory banks must be between 1 and 8 (inclusive).");
+            }
         }
 
         public void Write(Int16 address, Word data)

Models.cs

@@ -133,11 +133,24 @@ namespace CPUSimulation
             return addressString;
         }
     }
+
+
+    /// <summary>
+    /// A word is a collection of 2 Bytes
+    /// </summary>
     public class Word
     {
         Byte[] _bytes;
         public Word(Byte[] bytes)
         {
+            if (bytes.Length == 0 || bytes.Length > 2)
+            {
+                throw new ArgumentException("A word must consist of 1 or 2 bytes.");
+            }
+            else if (bytes.Length == 1)
+            {
+                _bytes = new Byte[2] { new Byte("00000000"), bytes[0] };
+            }
             _bytes = bytes;
         }
 
@@ -164,4 +177,42 @@ namespace CPUSimulation
             return wordString;
         }
     }
+
+    /// <summary>
+    /// A double word is a collection of 2 Words, or 4 Bytes
+    /// </summary>
+    public class DWord
+    {
+        Word _highWord;
+        Word _lowWord;
+        public DWord(Word highWord, Word lowWord)
+        {
+            _highWord = highWord;
+            _lowWord = lowWord;
+        }
+
+        public override string ToString()
+        {
+            return _highWord.ToString() + _lowWord.ToString();
+        }
+    }
+
+    /// <summary>
+    /// A quad word is a collection of 2 Double Words, or 8 Bytes
+    /// </summary>
+    public class QWord
+    {
+        DWord _highDWord;
+        DWord _lowDWord;
+        public QWord(DWord highDWord, DWord lowDWord)
+        {
+            _highDWord = highDWord;
+            _lowDWord = lowDWord;
+        }
+
+        override public string ToString()
+        {
+            return _highDWord.ToString() + _lowDWord.ToString();
+        }
+    }
 }

Utils.cs

@@ -3,16 +3,36 @@ namespace CPUSimulation
     public class Utils
     {
         static Random _random = new Random();
+
+        /// <summary>
+        /// Generates a random word 
+        /// </summary>
+        /// <param name="byteCount"></param>
+        /// input must be between 0 and 2 (inclusive)
+        /// <returns></returns>
+        /// <exception cref="ArgumentException"></exception>
         public static Word GenerateRandomWord(int byteCount)
         {
-            byteCount = _random.Next(1, byteCount + 1);
+            if (byteCount < 0)
-            //Console.WriteLine($"Generating random word with {byteCount} bytes.");
+            {
+                byteCount = 0;
+            }
             Byte[] bytes = new Byte[byteCount];
             for (int i = 0; i < byteCount; i++)
             {
                 bytes[i] = GenerateRandomByte();
             }
+            if (byteCount == 1)
+            {
+                bytes = new Byte[2] { new Byte("00000000"), bytes[0] };
+            }
+            else if (byteCount == 0)
+            {
+                bytes = new Byte[2] { new Byte("00000000"), new Byte("00000000") };
+            }
             return new Word(bytes);
+        
+            
         }
         public static Byte GenerateRandomByte()
         {
@@ -23,5 +43,10 @@ namespace CPUSimulation
             }
             return new Byte(bits);
         }
+
+        public static string Int16ToBinaryString(short value)
+        {
+            return Convert.ToString(value & 0xFFFF, 2).PadLeft(16, '0');
+        }
     }
 }

obj/Debug/net10.0/CPUSimulation.AssemblyInfo.cs

@@ -13,7 +13,7 @@ using System.Reflection;
 [assembly: System.Reflection.AssemblyCompanyAttribute("CPUSimulation")]
 [assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
 [assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
-[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+9efadc3b4a2f776b2177e2873a3b46b0d1af54c3")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0+faa7801376d988a2b7b81332c9df3db882f08224")]
 [assembly: System.Reflection.AssemblyProductAttribute("CPUSimulation")]
 [assembly: System.Reflection.AssemblyTitleAttribute("CPUSimulation")]
 [assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]

obj/Debug/net10.0/CPUSimulation.AssemblyInfoInputs.cache

@@ -1 +1 @@
-c2e5aae0cecf3bbefacc496747f7594154fd639e9a9c0b2086d3b9acd9b437a5
+0093ec249d1fba7433aea9a209b4614dc995df5d3b8e509911d9d959d0697898