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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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17
Core/Cpu/Z80.cs
View File

@@ -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!");
}
}
}
}

109
Desktop/DebuggerForm.Designer.cs generated
View File

@@ -48,94 +48,96 @@
label1 = new Label();
txtBreakpoint = new TextBox();
label2 = new Label();
lblIX = new Label();
lblIY = new Label();
SuspendLayout();
//
// lblAF
//
lblAF.AutoSize = true;
lblAF.Location = new Point(10, 7);
lblAF.Location = new Point(12, 9);
lblAF.Margin = new Padding(2, 0, 2, 0);
lblAF.Name = "lblAF";
lblAF.Size = new Size(26, 20);
lblAF.Size = new Size(33, 25);
lblAF.TabIndex = 0;
lblAF.Text = "AF";
//
// lblBC
//
lblBC.AutoSize = true;
lblBC.Location = new Point(9, 48);
lblBC.Location = new Point(11, 60);
lblBC.Margin = new Padding(2, 0, 2, 0);
lblBC.Name = "lblBC";
lblBC.Size = new Size(27, 20);
lblBC.Size = new Size(33, 25);
lblBC.TabIndex = 1;
lblBC.Text = "BC";
//
// lblDE
//
lblDE.AutoSize = true;
lblDE.Location = new Point(10, 100);
lblDE.Location = new Point(12, 125);
lblDE.Margin = new Padding(2, 0, 2, 0);
lblDE.Name = "lblDE";
lblDE.Size = new Size(28, 20);
lblDE.Size = new Size(34, 25);
lblDE.TabIndex = 2;
lblDE.Text = "DE";
//
// lblHL
//
lblHL.AutoSize = true;
lblHL.Location = new Point(10, 150);
lblHL.Location = new Point(12, 188);
lblHL.Margin = new Padding(2, 0, 2, 0);
lblHL.Name = "lblHL";
lblHL.Size = new Size(27, 20);
lblHL.Size = new Size(33, 25);
lblHL.TabIndex = 3;
lblHL.Text = "HL";
//
// lblPC
//
lblPC.AutoSize = true;
lblPC.Location = new Point(9, 200);
lblPC.Location = new Point(11, 250);
lblPC.Margin = new Padding(2, 0, 2, 0);
lblPC.Name = "lblPC";
lblPC.Size = new Size(26, 20);
lblPC.Size = new Size(33, 25);
lblPC.TabIndex = 4;
lblPC.Text = "PC";
//
// lblSP
//
lblSP.AutoSize = true;
lblSP.Location = new Point(9, 252);
lblSP.Location = new Point(11, 315);
lblSP.Margin = new Padding(2, 0, 2, 0);
lblSP.Name = "lblSP";
lblSP.Size = new Size(25, 20);
lblSP.Size = new Size(32, 25);
lblSP.TabIndex = 6;
lblSP.Text = "SP";
//
// lblFlags
//
lblFlags.AutoSize = true;
lblFlags.Location = new Point(88, 52);
lblFlags.Location = new Point(110, 65);
lblFlags.Margin = new Padding(2, 0, 2, 0);
lblFlags.Name = "lblFlags";
lblFlags.Size = new Size(43, 20);
lblFlags.Size = new Size(53, 25);
lblFlags.TabIndex = 7;
lblFlags.Text = "Flags";
//
// lblTStates
//
lblTStates.AutoSize = true;
lblTStates.Location = new Point(88, 7);
lblTStates.Location = new Point(110, 9);
lblTStates.Margin = new Padding(2, 0, 2, 0);
lblTStates.Name = "lblTStates";
lblTStates.Size = new Size(63, 20);
lblTStates.Size = new Size(75, 25);
lblTStates.TabIndex = 8;
lblTStates.Text = "T-States";
//
// txtMemoryStart
//
txtMemoryStart.Location = new Point(300, 21);
txtMemoryStart.Location = new Point(375, 26);
txtMemoryStart.Margin = new Padding(2);
txtMemoryStart.Name = "txtMemoryStart";
txtMemoryStart.Size = new Size(121, 27);
txtMemoryStart.Size = new Size(150, 31);
txtMemoryStart.TabIndex = 9;
txtMemoryStart.Text = "Memory Start";
txtMemoryStart.TextAlign = HorizontalAlignment.Center;
@@ -143,10 +145,10 @@
//
// btnStep
//
btnStep.Location = new Point(9, 315);
btnStep.Location = new Point(8, 523);
btnStep.Margin = new Padding(2);
btnStep.Name = "btnStep";
btnStep.Size = new Size(90, 27);
btnStep.Size = new Size(112, 34);
btnStep.TabIndex = 12;
btnStep.Text = "Step";
btnStep.UseVisualStyleBackColor = true;
@@ -154,10 +156,10 @@
//
// btnRun
//
btnRun.Location = new Point(122, 315);
btnRun.Location = new Point(149, 523);
btnRun.Margin = new Padding(2);
btnRun.Name = "btnRun";
btnRun.Size = new Size(90, 27);
btnRun.Size = new Size(112, 34);
btnRun.TabIndex = 13;
btnRun.Text = "Run";
btnRun.UseVisualStyleBackColor = true;
@@ -165,10 +167,10 @@
//
// btnRefreshMemory
//
btnRefreshMemory.Location = new Point(425, 21);
btnRefreshMemory.Location = new Point(531, 26);
btnRefreshMemory.Margin = new Padding(2);
btnRefreshMemory.Name = "btnRefreshMemory";
btnRefreshMemory.Size = new Size(90, 27);
btnRefreshMemory.Size = new Size(112, 34);
btnRefreshMemory.TabIndex = 14;
btnRefreshMemory.Text = "Refresh Memory";
btnRefreshMemory.UseVisualStyleBackColor = true;
@@ -176,37 +178,39 @@
//
// txtMemoryView
//
txtMemoryView.Location = new Point(88, 80);
txtMemoryView.Location = new Point(110, 100);
txtMemoryView.Margin = new Padding(2);
txtMemoryView.Name = "txtMemoryView";
txtMemoryView.Size = new Size(416, 195);
txtMemoryView.Size = new Size(519, 243);
txtMemoryView.TabIndex = 15;
txtMemoryView.Text = "Memory View Window";
//
// lstDisassembly
//
lstDisassembly.FormattingEnabled = true;
lstDisassembly.Location = new Point(523, 11);
lstDisassembly.ItemHeight = 25;
lstDisassembly.Location = new Point(654, 14);
lstDisassembly.Margin = new Padding(2);
lstDisassembly.Name = "lstDisassembly";
lstDisassembly.Size = new Size(252, 264);
lstDisassembly.Size = new Size(314, 329);
lstDisassembly.TabIndex = 16;
//
// lstStack
//
lstStack.FormattingEnabled = true;
lstStack.Location = new Point(779, 11);
lstStack.ItemHeight = 25;
lstStack.Location = new Point(974, 14);
lstStack.Margin = new Padding(2);
lstStack.Name = "lstStack";
lstStack.Size = new Size(130, 264);
lstStack.Size = new Size(162, 329);
lstStack.TabIndex = 17;
//
// btnExit
//
btnExit.Location = new Point(818, 313);
btnExit.Location = new Point(1019, 520);
btnExit.Margin = new Padding(2);
btnExit.Name = "btnExit";
btnExit.Size = new Size(90, 27);
btnExit.Size = new Size(112, 34);
btnExit.TabIndex = 18;
btnExit.Text = "Full Exit";
btnExit.UseVisualStyleBackColor = true;
@@ -215,33 +219,56 @@
// label1
//
label1.AutoSize = true;
label1.Location = new Point(289, 288);
label1.Location = new Point(361, 360);
label1.Margin = new Padding(4, 0, 4, 0);
label1.Name = "label1";
label1.Size = new Size(81, 20);
label1.Size = new Size(97, 25);
label1.TabIndex = 19;
label1.Text = "Breakpoint";
//
// txtBreakpoint
//
txtBreakpoint.Location = new Point(376, 281);
txtBreakpoint.Location = new Point(470, 351);
txtBreakpoint.Margin = new Padding(4, 4, 4, 4);
txtBreakpoint.Name = "txtBreakpoint";
txtBreakpoint.Size = new Size(125, 27);
txtBreakpoint.Size = new Size(155, 31);
txtBreakpoint.TabIndex = 20;
//
// label2
//
label2.AutoSize = true;
label2.Location = new Point(233, 21);
label2.Location = new Point(291, 26);
label2.Margin = new Padding(4, 0, 4, 0);
label2.Name = "label2";
label2.Size = new Size(62, 20);
label2.Size = new Size(77, 25);
label2.TabIndex = 21;
label2.Text = "Address";
//
// lblIX
//
lblIX.AutoSize = true;
lblIX.Location = new Point(11, 373);
lblIX.Name = "lblIX";
lblIX.Size = new Size(28, 25);
lblIX.TabIndex = 22;
lblIX.Text = "IX";
//
// lblIY
//
lblIY.AutoSize = true;
lblIY.Location = new Point(12, 430);
lblIY.Name = "lblIY";
lblIY.Size = new Size(27, 25);
lblIY.TabIndex = 23;
lblIY.Text = "IY";
//
// DebuggerForm
//
AutoScaleDimensions = new SizeF(8F, 20F);
AutoScaleDimensions = new SizeF(10F, 25F);
AutoScaleMode = AutoScaleMode.Font;
ClientSize = new Size(928, 350);
ClientSize = new Size(1160, 568);
Controls.Add(lblIY);
Controls.Add(lblIX);
Controls.Add(label2);
Controls.Add(txtBreakpoint);
Controls.Add(label1);
@@ -290,6 +317,8 @@
private Label label1;
private TextBox txtBreakpoint;
private Label label2;
private Label lblIX;
private Label lblIY;
//private TextBox textBox4;
}
}

19
Desktop/DebuggerForm.cs
View File

@@ -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()}";
@@ -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;