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Implemented many more OpCodes - 11042026_02_38

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This commit is contained in:
Marc Parsons
2026-04-11 02:38:20 +01:00
parent d953eb4ec7
commit c2bbaf7672
3 changed files with 106 additions and 41 deletions
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21
Desktop/DebuggerForm.cs
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@@ -132,6 +132,8 @@ namespace Desktop
lblHL.Text = $"HL: {_cpu.HL.Word:X4}";
lblPC.Text = $"PC: {_cpu.PC:X4}";
lblSP.Text = $"SP: {_cpu.SP:X4}";
lblIX.Text = $"IX: {_cpu.IX.Word:X4}";
lblIY.Text = $"IY: {_cpu.IY.Word:X4}";
// 2. Update Flags & T-States
lblFlags.Text = $"Flags: {_cpu.GetFlagsString()}";
@@ -345,7 +347,7 @@ namespace Desktop
ushort bcAddr = (ushort)(_memoryBus.Read((ushort)(currentPc + 2)) | (_memoryBus.Read((ushort)(currentPc + 3)) << 8));
mnemonic = $"LD (0x{bcAddr:X4}), BC";
instructionLength = 4;
break;
break;
case 0x47:
mnemonic = "LD I, A";
instructionLength = 2; // 0xED + 0x47
@@ -384,6 +386,23 @@ namespace Desktop
case 0xF9:
mnemonic = "LD SP, HL";
break;
case 0xFD:
{
byte fdOpcode = _memoryBus.Read((ushort)(currentPc + 1));
if (fdOpcode == 0x21) // LD IY, nn
{
ushort iyVal = (ushort)(_memoryBus.Read((ushort)(currentPc + 2)) | (_memoryBus.Read((ushort)(currentPc + 3)) << 8));
mnemonic = $"LD IY, 0x{iyVal:X4}";
instructionLength = 4;
}
else
{
mnemonic = $"FD PREFIX UNKNOWN (0x{fdOpcode:X2})";
instructionLength = 2; // Fallback so we don't freeze the UI
}
break;
}
default:
mnemonic = $"UNKNOWN (0x{opcode:X2})";
break;