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Implemented many more OpCodes

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This commit is contained in:
Marc Parsons
2026-04-13 21:19:05 +01:00
parent c642f7a6c6
commit 2b40960496
4 changed files with 222 additions and 52 deletions
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53
Desktop/DebuggerForm.cs
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@@ -117,6 +117,30 @@ namespace Desktop
UpdateDisplay();
}
private void btnReset_Click(object sender, EventArgs e)
{
// 1. Safely stop the emulator if it is currently in a Run loop
if (_isRunning)
{
_isRunning = false;
btnRun.Text = "Run";
}
// 2. Power cycle the CPU
_cpu.Reset();
// Note: A true hard reset also wipes the RAM.
// If you add a RAM clear method to your MemoryBus later, call it here!
_memoryBus.ClearRam(); //To Do
// 3. Clear the UI tracking lists
lstDisassembly.Items.Clear();
lstStack.Items.Clear();
// 4. Force a full UI refresh to show the clean slate
UpdateDisplay();
}
private void btnExit_Click(object sender, EventArgs e)
{
Environment.Exit(0);
@@ -253,6 +277,11 @@ namespace Desktop
mnemonic = $"LD DE, 0x{deHigh:X2}{deLow:X2}";
instructionLength = 3;
break;
case 0x16:
byte dImm = _memoryBus.Read((ushort)(currentPc + 1));
mnemonic = $"LD D, 0x{dImm:X2}";
instructionLength = 2;
break;
case 0x19:
mnemonic = "ADD HL, DE";
break;
@@ -321,6 +350,9 @@ namespace Desktop
case 0x47:
mnemonic = "LD B, A";
break;
case 0x5F:
mnemonic = "LD E, A";
break;
case 0x62:
mnemonic = "LD H, D";
break;
@@ -330,6 +362,9 @@ namespace Desktop
case 0x77:
mnemonic = "LD (HL), A";
break;
case 0x91:
mnemonic = "SUB C";
break;
case 0xA7:
mnemonic = "AND A";
break;
@@ -346,6 +381,9 @@ namespace Desktop
mnemonic = $"JP 0x{jpHigh:X2}{jpLow:X2}";
instructionLength = 3;
break;
case 0xC9:
mnemonic = "RET";
break;
case 0xCD:
ushort callDest = (ushort)(_memoryBus.Read((ushort)(currentPc + 1)) | (_memoryBus.Read((ushort)(currentPc + 2)) << 8));
mnemonic = $"CALL 0x{callDest:X4}";
@@ -435,6 +473,14 @@ namespace Desktop
mnemonic = $"DEC (IY{sign}{d})";
instructionLength = 3;
}
else if (fdOpcode == 0x36) // LD (IY+d), n
{
sbyte d = (sbyte)_memoryBus.Read((ushort)(currentPc + 2));
byte n = _memoryBus.Read((ushort)(currentPc + 3));
string sign = d >= 0 ? "+" : "";
mnemonic = $"LD (IY{sign}{d}), 0x{n:X2}";
instructionLength = 4;
}
else if (fdOpcode == 0xCB) // FD CB prefix
{
sbyte d = (sbyte)_memoryBus.Read((ushort)(currentPc + 2));
@@ -454,6 +500,13 @@ namespace Desktop
}
instructionLength = 4;
}
else if (fdOpcode == 0x71) // LD (IY+d), C
{
sbyte d = (sbyte)_memoryBus.Read((ushort)(currentPc + 2));
string sign = d >= 0 ? "+" : "";
mnemonic = $"LD (IY{sign}{d}), C";
instructionLength = 3;
}
else if (fdOpcode == 0x75) // LD (IY+d), L
{
sbyte d = (sbyte)_memoryBus.Read((ushort)(currentPc + 2));