Added Debugger

Core/Cpu/Z80.cs

@@ -5,6 +5,9 @@ namespace Core.Cpu
 {
     public partial class Z80
     {
+        //T-State counter
+        public long TotalTStates { get; set; }
+
         // Main Register Set
         public RegisterPair AF;
         public RegisterPair BC;
@@ -52,9 +55,24 @@ namespace Core.Cpu
         {
             // Fetch the next opcode and increment the Program Counter
             byte opcode = _memory.Read(PC++);
+            int tStates = ExecuteOpcode(opcode);
+            TotalTStates += tStates;
 
             // Decode and execute
-            return ExecuteOpcode(opcode);
+            return tStates;
+        }
+
+        public string GetFlagsString()
+        {
+            byte f = AF.Low;
+            return $"S:{(f >> 7) & 1} " +
+                   $"Z:{(f >> 6) & 1} " +
+                   $"Y:{(f >> 5) & 1} " + // Undocumented flag
+                   $"H:{(f >> 4) & 1} " +
+                   $"X:{(f >> 3) & 1} " + // Undocumented flag
+                   $"P/V:{(f >> 2) & 1} " +
+                   $"N:{(f >> 1) & 1} " +
+                   $"C:{f & 1}";
         }
 
         private int ExecuteOpcode(byte opcode)