Implemented enough OpCodes for the CPU to run forever

Core/Cpu/Z80.cs

@@ -490,6 +490,8 @@ namespace Core.Cpu
                     return 7;
                 case 0x14: DE.High = Inc8(DE.High); return 4; // INC D
                 case 0x1C: DE.Low = Inc8(DE.Low); return 4;   // INC E
+                case 0x1E: DE.Low = FetchByte(); // LD E, n
+                    return 7;
                 case 0x24: HL.High = Inc8(HL.High); return 4; // INC H
                 case 0x2C: HL.Low = Inc8(HL.Low); return 4;   // INC L
                 case 0x34:

Desktop/DebuggerForm.cs

@@ -341,6 +341,11 @@ namespace Desktop
                     case 0x1B:
                         mnemonic = "DEC DE";
                         break;
+                    case 0x1E:
+                        byte val1E = _memoryBus.Read((ushort)(currentPc + 1));
+                        mnemonic = $"LD E, 0x{val1E:X2}";
+                        instructionLength = 2;
+                        break;
                     case 0x20:
                         sbyte jrOffset = (sbyte)_memoryBus.Read((ushort)(currentPc + 1));
                         ushort destination = (ushort)(currentPc + 2 + jrOffset);