All keys implemented and a few more OpCodes

Core/Cpu/Z80.cs

@@ -1677,6 +1677,17 @@ namespace Core.Cpu
                     // 4. Write the immediate value directly into memory
                     _memory.Write(address36, n36);
 
+                    return 19;
+                case 0x56: // LD D, (IX+d)
+                           // 1. Fetch the displacement byte and cast it to a signed sbyte
+                    sbyte offset56 = (sbyte)FetchByte();
+
+                    // 2. Calculate the exact memory address (IX + offset)
+                    ushort address56 = (ushort)(IX.Word + offset56);
+
+                    // 3. Read the byte from memory and drop it into the D register (High byte of DE)
+                    DE.High = _memory.Read(address56);
+
                     return 19;
                 case 0x5E: // LD E, (IX+d)
                            // 1. Fetch the displacement byte and cast it to a signed sbyte
@@ -1688,7 +1699,18 @@ namespace Core.Cpu
                     // 3. Read the byte from memory and drop it into the E register
                     DE.Low = _memory.Read(address5E);
 
-                    return 19; // 19 T-States
+                    return 19;
+                case 0x6E: // LD L, (IX+d)
+                           // 1. Fetch the displacement byte and cast it to a signed sbyte
+                    sbyte offset6E = (sbyte)FetchByte();
+
+                    // 2. Calculate the exact memory address (IX + offset)
+                    ushort address6E = (ushort)(IX.Word + offset6E);
+
+                    // 3. Read the byte from memory and drop it into the L register (Low byte of HL)
+                    HL.Low = _memory.Read(address6E);
+
+                    return 19;
                 case 0x74: // LD (IX+d), H
                            // 1. Fetch the displacement byte and cast it to a signed sbyte
                     sbyte offset74 = (sbyte)FetchByte();