Modified so I can run my 6809 sudoku solver, similar to 6502 version.

MC6809/MC6809.Test/Board.cs

@@ -23,9 +23,10 @@ namespace MC6809.Test
         private readonly Disassembler _disassembler;
         private readonly Profiler _profiler;
 
-        private ulong _totalCycleCount;
         private long _frameCycleCount;
 
+        private readonly Register16 _oldPC = new((ushort)Mask.Sixteen);
+
         // The _disassembleAt and _ignoreDisassembly are used to skip pin events
         private ushort _disassembleAt;
         private bool _ignoreDisassembly;
@@ -101,9 +102,13 @@ namespace MC6809.Test
         {
             Console.TreatControlCAsInput = true;
 
-            // Load our BASIC interpreter
             var directory = this._configuration.RomDirectory + "\\";
-            LoadHexFile(directory + "ExBasROM.hex");
+
+            // Load our BASIC interpreter
+            LoadHexFile(directory + "searle\\ExBasROM.hex");
+
+            // Load our Sudoku solver
+            //LoadHexFile(directory + "6809_sudoku\\sudoku.hex");
 
             // Catch a byte being transmitted
             this.ACIA.Transmitting += ACIA_Transmitting;
@@ -163,8 +168,11 @@ namespace MC6809.Test
 
         private void CPU_ExecutedInstruction_Termination(object? sender, EventArgs e)
         {
-            this._totalCycleCount += (ulong)this.CPU.Cycles;
-            if (this._totalCycleCount > Configuration.TerminationCycles)
+            if (this._oldPC != this.CPU.PC)
+            {
+                this._oldPC.Assign(this.CPU.PC);
+            }
+            else
             {
                 this.LowerPOWER();
             }

MC6809/MC6809.Test/Configuration.cs

@@ -8,12 +8,11 @@ namespace EightBit
     {
         public static readonly ulong CyclesPerSecond = 2 * 1024 * 1024;
         public static readonly ulong FrameCycleInterval = CyclesPerSecond / 60;
-        public static readonly ulong TerminationCycles = CyclesPerSecond * 10 * 10;
-
+       
         public bool DebugMode { get; set;  } = false;
 
-        public bool TerminatesEarly { get; } = false;
+        public bool TerminatesEarly { get; } = true;
 
-        public string RomDirectory { get; } = "roms\\searle";
+        public string RomDirectory { get; } = "roms";
     }
 }

MC6809/MC6809.Test/Program.cs

@@ -4,6 +4,8 @@
 
 namespace EightBit
 {
+    using MC6809.Test;
+
     internal static class Program
     {
         public static void Main(string[] args)
@@ -14,7 +16,8 @@ namespace EightBit
             configuration.DebugMode = true;
 #endif
 
-            var harness = new TestHarness(configuration);
+            var board = new Board(configuration);
+            var harness = new EightBit.TestHarness<Board, MC6809.MC6809>(board, board.CPU);
             harness.Run();
         }
     }

MC6809/MC6809.Test/TestHarness.cs

@@ -1,35 +0,0 @@
-// <copyright file="TestHarness.cs" company="Adrian Conlon">
-// Copyright (c) Adrian Conlon. All rights reserved.
-// </copyright>
-
-namespace EightBit
-{
-    using MC6809.Test;
-    using System.Diagnostics;
-
-    internal sealed class TestHarness(Configuration configuration)
-    {
-        private readonly Stopwatch timer = new();
-        private readonly Board board = new(configuration);
-        private long totalCycles;
-
-        public void Run()
-        {
-            this.board.Initialize();
-            this.board.RaisePOWER();
-
-            var cpu = this.board.CPU;
-
-            this.timer.Start();
-            while (cpu.Powered)
-            {
-                this.totalCycles += cpu.Step();
-            }
-
-            this.timer.Stop();
-
-            System.Console.Out.WriteLine($"\n\nGuest cycles = {this.totalCycles}");
-            System.Console.Out.WriteLine($"Seconds = {this.timer.ElapsedMilliseconds / 1000.0}");
-        }
-    }
-}