Pissing about with TZX support

Core/Cpu/Z80.cs

@@ -1312,6 +1312,9 @@ namespace Core.Cpu
                 case 0x4D: // RETI Does not affect IFF1 or IFF2
                     PC = Pop();
                     return 14;
+                case 0x4F: // LD R, A
+                    R = AF.High;
+                    return 9;
                 case 0x51: // OUT (C), D
                            // BC.Word goes to the address bus, D (DE.High) goes to the data bus
                     _simpleIoBus.WritePort(BC.Word, DE.High);