diff --git a/Intel8080/Intel8080.Test/Program.cs b/Intel8080/Intel8080.Test/Program.cs
index 1cff8a4..e5e4b10 100644
--- a/Intel8080/Intel8080.Test/Program.cs
+++ b/Intel8080/Intel8080.Test/Program.cs
@@ -14,10 +14,8 @@ namespace Intel8080.Test
             configuration.DebugMode = true;
 #endif
 
-            using (var harness = new TestHarness(configuration))
-            {
-                harness.Run();
-            }
+            var harness = new TestHarness(configuration);
+            harness.Run();
         }
     }
 }
diff --git a/Intel8080/Intel8080.Test/TestHarness.cs b/Intel8080/Intel8080.Test/TestHarness.cs
index ffdad45..46e8cc2 100644
--- a/Intel8080/Intel8080.Test/TestHarness.cs
+++ b/Intel8080/Intel8080.Test/TestHarness.cs
@@ -4,24 +4,13 @@
 
 namespace Intel8080.Test
 {
-    using System;
     using System.Diagnostics;
 
-    internal class TestHarness : IDisposable
+    internal class TestHarness(Configuration configuration)
     {
-        private readonly Stopwatch timer = new Stopwatch();
-        private readonly Board board;
-        private long totalCycles = 0;
-
-        private bool disposed = false;
-
-        public TestHarness(Configuration configuration) => this.board = new Board(configuration);
-
-        public void Dispose()
-        {
-            this.Dispose(true);
-            GC.SuppressFinalize(this);
-        }
+        private readonly Stopwatch timer = new();
+        private readonly Board board = new(configuration);
+        private long totalCycles;
 
         public void Run()
         {
@@ -37,20 +26,9 @@ namespace Intel8080.Test
             }
 
             this.timer.Stop();
-        }
 
-        protected virtual void Dispose(bool disposing)
-        {
-            if (!this.disposed)
-            {
-                if (disposing)
-                {
-                    System.Console.Out.WriteLine($"\n\nGuest cycles = {this.totalCycles}");
-                    System.Console.Out.WriteLine($"Seconds = {this.timer.ElapsedMilliseconds / 1000.0}");
-                }
-
-                this.disposed = true;
-            }
+            System.Console.Out.WriteLine($"\n\nGuest cycles = {this.totalCycles}");
+            System.Console.Out.WriteLine($"Seconds = {this.timer.ElapsedMilliseconds / 1000.0}");
         }
     }
 }
diff --git a/M6502/M6502.Test/Program.cs b/M6502/M6502.Test/Program.cs
index 618fd1b..e57b7f8 100644
--- a/M6502/M6502.Test/Program.cs
+++ b/M6502/M6502.Test/Program.cs
@@ -11,12 +11,10 @@ namespace M6502.Test
             var configuration = new Configuration();
 
 #if DEBUG
-            configuration.DebugMode;
+            configuration.DebugMode = false;
 #endif
-            using (var harness = new TestHarness(configuration))
-            {
-                harness.Run();
-            }
+            var harness = new TestHarness(configuration);
+            harness.Run();
         }
     }
 }
diff --git a/MC6809/MC6809.Test/Program.cs b/MC6809/MC6809.Test/Program.cs
index 5d6c992..c9d10fd 100644
--- a/MC6809/MC6809.Test/Program.cs
+++ b/MC6809/MC6809.Test/Program.cs
@@ -14,10 +14,8 @@ namespace EightBit
             configuration.DebugMode = true;
 #endif
 
-            using (var harness = new TestHarness(configuration))
-            {
-                harness.Run();
-            }
+            var harness = new TestHarness(configuration);
+            harness.Run();
         }
     }
 }
diff --git a/MC6809/MC6809.Test/TestHarness.cs b/MC6809/MC6809.Test/TestHarness.cs
index 86fc582..d9dd6f8 100644
--- a/MC6809/MC6809.Test/TestHarness.cs
+++ b/MC6809/MC6809.Test/TestHarness.cs
@@ -4,24 +4,13 @@
 
 namespace EightBit
 {
-    using System;
     using System.Diagnostics;
 
-    internal class TestHarness : IDisposable
+    internal sealed class TestHarness(Configuration configuration)
     {
-        private readonly Stopwatch timer = new Stopwatch();
-        private readonly Board board;
-        private long totalCycles = 0;
-
-        private bool disposed = false;
-
-        public TestHarness(Configuration configuration) => this.board = new Board(configuration);
-
-        public void Dispose()
-        {
-            this.Dispose(true);
-            GC.SuppressFinalize(this);
-        }
+        private readonly Stopwatch timer = new();
+        private readonly Board board = new(configuration);
+        private long totalCycles;
 
         public void Run()
         {
@@ -37,20 +26,9 @@ namespace EightBit
             }
 
             this.timer.Stop();
-        }
 
-        protected virtual void Dispose(bool disposing)
-        {
-            if (!this.disposed)
-            {
-                if (disposing)
-                {
-                    System.Console.Out.WriteLine($"\n\nGuest cycles = {this.totalCycles}");
-                    System.Console.Out.WriteLine($"Seconds = {this.timer.ElapsedMilliseconds / 1000.0}");
-                }
-
-                this.disposed = true;
-            }
+            System.Console.Out.WriteLine($"\n\nGuest cycles = {this.totalCycles}");
+            System.Console.Out.WriteLine($"Seconds = {this.timer.ElapsedMilliseconds / 1000.0}");
         }
     }
 }