Updated Z80 CPU to fix interrupts etc...

Desktop/DebuggerForm.cs

@@ -110,11 +110,12 @@ namespace Desktop
             lblFrames.Text = $"Frames Rendered: {_mainForm.TotalFrameCount}";
             lblFrameTime.Text = $"Frame Time: {((float)_mainForm.FrameTime):F1}ms";
             lblFPS.Text = $"FPS: {_mainForm.FramesPerSecond:F2}";
+            lblHalt.Text = $"CPU Halted: {_cpu.IsHalted}";
+            lblR.Text = $"R: {_cpu.R:X2}";
             UpdateMemoryView();
             UpdateStackView();
             UpdateDisassemblyView();
-            // --- AUDIO REGISTERS ---
-            // Use _mainForm to access the Machine, and then grab the AudioProcessor!
+            // --- AUDIO REGISTERS ---//
             if (_mainForm._machine != null && _mainForm._machine.AudioProcessor != null)
             {
                 ushort[] apuRegs = _mainForm._machine.AudioProcessor.Registers;
@@ -668,6 +669,9 @@ namespace Desktop
                     case 0xC9:
                         mnemonic = "RET";
                         break;
+                    case 0x76:
+                        mnemonic = "HALT!";
+                        break;
                     case 0xCB:
                         cbOp = _memoryBus.Read((ushort)(currentPc + 1));