Implemented many more OpCodes - 11042026_02_38

2026-04-11 02:38:20 +01:00
parent d953eb4ec7
commit c2bbaf7672
3 changed files with 106 additions and 41 deletions
--- a/Core/Cpu/Z80.cs
+++ b/Core/Cpu/Z80.cs
@@ -447,6 +447,8 @@ namespace Core.Cpu
                case 0xF9: // LD SP, HL
                    SP = HL.Word; // (Use SP.Word = HL.Word if you made SP a RegisterPair)
                    return 6;
+                case 0xFD:
+                    return ExecuteFDPrefix();
                default:
                    throw new NotImplementedException($"Opcode 0x{opcode:X2} at PC 0x{(PC - 1):X4} is not implemented.");
            }
@@ -509,5 +511,20 @@ namespace Core.Cpu
                    throw new NotImplementedException($"Extended ED Opcode 0x{extendedOpcode:X2} at PC 0x{(PC - 1):X4} is not implemented.");
            }
        }
+
+        private int ExecuteFDPrefix()
+        {
+            byte opcode = FetchByte();
+
+            switch (opcode)
+            {
+                case 0x21: // LD IY, nn
+                    IY.Word = FetchWord();
+                    return 14; // Takes 14 T-States
+
+                default:
+                    throw new NotImplementedException($"FD prefix opcode {opcode:X2} not implemented!");
+            }
+        }
    }
 }