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Some fixes and code refactoring

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This commit is contained in:
Marc Parsons
2026-05-22 16:40:33 +01:00
parent cca1abf0be
commit b5695b5c2f
7 changed files with 233 additions and 190 deletions
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17
Core/Cpu/Z80.cs
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@@ -25,10 +25,12 @@ namespace Core.Cpu
public int InterruptMode { get; private set; } = 0; public int InterruptMode { get; private set; } = 0;
// Interrupt Flip-Flops // Interrupt Flip-Flops
public bool IFF1 { get; private set; } = false; public bool IFF1 { get; private set; } = false;
public bool IFF2 { get; private set; } = false; public bool IFF2 { get; private set; } = false;
public bool InterruptRequested { get; private set; } = false; public bool InterruptRequested { get; private set; } = false;
private bool _eiPending = false;
// Main Register Set // Main Register Set
public RegisterPair AF; public RegisterPair AF;
@@ -214,6 +216,7 @@ namespace Core.Cpu
public int Step() public int Step()
{ {
bool triggerEi = _eiPending;
// Fetch the next opcode and increment the Program Counter // Fetch the next opcode and increment the Program Counter
byte opcode = ReadMemory(PC++); byte opcode = ReadMemory(PC++);
@@ -221,6 +224,13 @@ namespace Core.Cpu
int tStates = ExecuteOpcode(opcode); int tStates = ExecuteOpcode(opcode);
TotalTStates += tStates; TotalTStates += tStates;
if (triggerEi)
{
IFF1 = true;
IFF2 = true;
_eiPending = false;
}
// Decode and execute // Decode and execute
return tStates; return tStates;
} }
@@ -240,9 +250,6 @@ namespace Core.Cpu
$"C:{f & 1}"; $"C:{f & 1}";
} }
// =========================================================================
// MATH AND LOGIC HELPERS
// =========================================================================
private void SubA(byte value, bool isCompare) private void SubA(byte value, bool isCompare)
{ {
@@ -1272,6 +1279,7 @@ namespace Core.Cpu
case 0xF3: // DI case 0xF3: // DI
IFF1 = false; IFF1 = false;
IFF2 = false; IFF2 = false;
_eiPending = false;
return 4; return 4;
case 0xf5: //push af case 0xf5: //push af
Push(AF.Word); Push(AF.Word);
@@ -1283,8 +1291,7 @@ namespace Core.Cpu
SP = HL.Word; SP = HL.Word;
return 6; return 6;
case 0xFB: // EI case 0xFB: // EI
IFF1 = true; _eiPending = true;
IFF2 = true;
return 4; return 4;
case 0xFD: case 0xFD:
return ExecuteFDPrefix(); return ExecuteFDPrefix();

7
Core/Memory/SmsMemoryBus.cs
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@@ -42,6 +42,11 @@ namespace Core.Memory
public byte Read(ushort address) public byte Read(ushort address)
{ {
if (address < 0xC000 && !_isCartridgeLoaded)
{
return 0xFF;
}
if (address < 0x4000) if (address < 0x4000)
{ {
if (address < 0x0400) if (address < 0x0400)
@@ -65,7 +70,7 @@ namespace Core.Memory
return _cartridgeRom[(_romBank2 * 0x4000) + (address - 0x8000)]; return _cartridgeRom[(_romBank2 * 0x4000) + (address - 0x8000)];
} }
// THE FIX 1: Bitwise AND perfectly forces 0xE000-0xFFFF to mirror down to 0xC000! // Bitwise AND perfectly forces 0xE000-0xFFFF to mirror down to 0xC000!
return _workRam[address & 0x1FFF]; return _workRam[address & 0x1FFF];
} }

18
Core/Video/SmsVdp.cs
View File

@@ -40,7 +40,7 @@ namespace Core.Video
_isSecondControlByte = false; // Reading data resets the control latch _isSecondControlByte = false; // Reading data resets the control latch
byte value = _readBuffer; byte value = _readBuffer;
_readBuffer = VRAM[_controlWord & 0x3FFF]; _readBuffer = VRAM[_controlWord & 0x3FFF];
_controlWord++; IncrementVdpAddress();
return value; return value;
} }
@@ -82,7 +82,7 @@ namespace Core.Video
} }
// THE FIX: The pointer MUST auto-increment so the CPU can blast data fast! // THE FIX: The pointer MUST auto-increment so the CPU can blast data fast!
_controlWord++; IncrementVdpAddress();
} }
public void WriteControlPort(byte value) // Port 0xBF public void WriteControlPort(byte value) // Port 0xBF
@@ -104,7 +104,7 @@ namespace Core.Video
if (command == 0) // Code 0: Prep for VRAM Read if (command == 0) // Code 0: Prep for VRAM Read
{ {
_readBuffer = VRAM[_controlWord & 0x3FFF]; _readBuffer = VRAM[_controlWord & 0x3FFF];
_controlWord++; IncrementVdpAddress();
} }
else if (command == 2) // Code 2: Write to Internal VDP Register else if (command == 2) // Code 2: Write to Internal VDP Register
{ {
@@ -116,6 +116,18 @@ namespace Core.Video
} }
} }
private void IncrementVdpAddress()
{
// The VDP address register is only 14 bits
// When it increments past 0x3FFF, it rolls over to 0x0000.
// It can't overflow and corrupt the 2-bit command register (bits 14 and 15).
ushort address = (ushort)(_controlWord & 0x3FFF);
ushort command = (ushort)(_controlWord & 0xC000);
address = (ushort)((address + 1) & 0x3FFF);
_controlWord = (ushort)(command | address);
}
public byte ReadVCounter() public byte ReadVCounter()
{ {
// NTSC Math: 262 lines. Counts 0 to 218, jumps to 213 (0xD5), counts to 255. // NTSC Math: 262 lines. Counts 0 to 218, jumps to 213 (0xD5), counts to 255.

211
Desktop/DebuggerForm.Designer.cs generated
View File

@@ -56,102 +56,102 @@
lblFPS = new Label(); lblFPS = new Label();
lblFrameTime = new Label(); lblFrameTime = new Label();
richTextBox1 = new RichTextBox(); richTextBox1 = new RichTextBox();
button1 = new Button(); btnCpuStep = new Button();
CpuRun = new Button(); CpuRun = new Button();
groupBox1 = new GroupBox(); groupBox1 = new GroupBox();
lblTone0 = new Label();
lblNoise = new Label();
lblTone2 = new Label();
lblTone1 = new Label(); lblTone1 = new Label();
lblTone2 = new Label();
lblNoise = new Label();
lblTone0 = new Label();
groupBox1.SuspendLayout(); groupBox1.SuspendLayout();
SuspendLayout(); SuspendLayout();
// //
// lblAF // lblAF
// //
lblAF.AutoSize = true; lblAF.AutoSize = true;
lblAF.Location = new Point(12, 9); lblAF.Location = new Point(10, 7);
lblAF.Margin = new Padding(2, 0, 2, 0); lblAF.Margin = new Padding(2, 0, 2, 0);
lblAF.Name = "lblAF"; lblAF.Name = "lblAF";
lblAF.Size = new Size(33, 25); lblAF.Size = new Size(26, 20);
lblAF.TabIndex = 0; lblAF.TabIndex = 0;
lblAF.Text = "AF"; lblAF.Text = "AF";
// //
// lblBC // lblBC
// //
lblBC.AutoSize = true; lblBC.AutoSize = true;
lblBC.Location = new Point(11, 60); lblBC.Location = new Point(9, 48);
lblBC.Margin = new Padding(2, 0, 2, 0); lblBC.Margin = new Padding(2, 0, 2, 0);
lblBC.Name = "lblBC"; lblBC.Name = "lblBC";
lblBC.Size = new Size(33, 25); lblBC.Size = new Size(27, 20);
lblBC.TabIndex = 1; lblBC.TabIndex = 1;
lblBC.Text = "BC"; lblBC.Text = "BC";
// //
// lblDE // lblDE
// //
lblDE.AutoSize = true; lblDE.AutoSize = true;
lblDE.Location = new Point(12, 125); lblDE.Location = new Point(10, 100);
lblDE.Margin = new Padding(2, 0, 2, 0); lblDE.Margin = new Padding(2, 0, 2, 0);
lblDE.Name = "lblDE"; lblDE.Name = "lblDE";
lblDE.Size = new Size(34, 25); lblDE.Size = new Size(28, 20);
lblDE.TabIndex = 2; lblDE.TabIndex = 2;
lblDE.Text = "DE"; lblDE.Text = "DE";
// //
// lblHL // lblHL
// //
lblHL.AutoSize = true; lblHL.AutoSize = true;
lblHL.Location = new Point(12, 188); lblHL.Location = new Point(10, 150);
lblHL.Margin = new Padding(2, 0, 2, 0); lblHL.Margin = new Padding(2, 0, 2, 0);
lblHL.Name = "lblHL"; lblHL.Name = "lblHL";
lblHL.Size = new Size(33, 25); lblHL.Size = new Size(27, 20);
lblHL.TabIndex = 3; lblHL.TabIndex = 3;
lblHL.Text = "HL"; lblHL.Text = "HL";
// //
// lblPC // lblPC
// //
lblPC.AutoSize = true; lblPC.AutoSize = true;
lblPC.Location = new Point(11, 250); lblPC.Location = new Point(9, 200);
lblPC.Margin = new Padding(2, 0, 2, 0); lblPC.Margin = new Padding(2, 0, 2, 0);
lblPC.Name = "lblPC"; lblPC.Name = "lblPC";
lblPC.Size = new Size(33, 25); lblPC.Size = new Size(26, 20);
lblPC.TabIndex = 4; lblPC.TabIndex = 4;
lblPC.Text = "PC"; lblPC.Text = "PC";
// //
// lblSP // lblSP
// //
lblSP.AutoSize = true; lblSP.AutoSize = true;
lblSP.Location = new Point(11, 315); lblSP.Location = new Point(9, 252);
lblSP.Margin = new Padding(2, 0, 2, 0); lblSP.Margin = new Padding(2, 0, 2, 0);
lblSP.Name = "lblSP"; lblSP.Name = "lblSP";
lblSP.Size = new Size(32, 25); lblSP.Size = new Size(25, 20);
lblSP.TabIndex = 6; lblSP.TabIndex = 6;
lblSP.Text = "SP"; lblSP.Text = "SP";
// //
// lblFlags // lblFlags
// //
lblFlags.AutoSize = true; lblFlags.AutoSize = true;
lblFlags.Location = new Point(110, 65); lblFlags.Location = new Point(88, 52);
lblFlags.Margin = new Padding(2, 0, 2, 0); lblFlags.Margin = new Padding(2, 0, 2, 0);
lblFlags.Name = "lblFlags"; lblFlags.Name = "lblFlags";
lblFlags.Size = new Size(53, 25); lblFlags.Size = new Size(43, 20);
lblFlags.TabIndex = 7; lblFlags.TabIndex = 7;
lblFlags.Text = "Flags"; lblFlags.Text = "Flags";
// //
// lblTStates // lblTStates
// //
lblTStates.AutoSize = true; lblTStates.AutoSize = true;
lblTStates.Location = new Point(110, 9); lblTStates.Location = new Point(88, 7);
lblTStates.Margin = new Padding(2, 0, 2, 0); lblTStates.Margin = new Padding(2, 0, 2, 0);
lblTStates.Name = "lblTStates"; lblTStates.Name = "lblTStates";
lblTStates.Size = new Size(75, 25); lblTStates.Size = new Size(63, 20);
lblTStates.TabIndex = 8; lblTStates.TabIndex = 8;
lblTStates.Text = "T-States"; lblTStates.Text = "T-States";
// //
// txtMemoryStart // txtMemoryStart
// //
txtMemoryStart.Location = new Point(375, 26); txtMemoryStart.Location = new Point(300, 21);
txtMemoryStart.Margin = new Padding(2); txtMemoryStart.Margin = new Padding(2);
txtMemoryStart.Name = "txtMemoryStart"; txtMemoryStart.Name = "txtMemoryStart";
txtMemoryStart.Size = new Size(150, 31); txtMemoryStart.Size = new Size(121, 27);
txtMemoryStart.TabIndex = 9; txtMemoryStart.TabIndex = 9;
txtMemoryStart.Text = "Memory Start"; txtMemoryStart.Text = "Memory Start";
txtMemoryStart.TextAlign = HorizontalAlignment.Center; txtMemoryStart.TextAlign = HorizontalAlignment.Center;
@@ -159,10 +159,10 @@
// //
// btnRefreshMemory // btnRefreshMemory
// //
btnRefreshMemory.Location = new Point(531, 26); btnRefreshMemory.Location = new Point(425, 21);
btnRefreshMemory.Margin = new Padding(2); btnRefreshMemory.Margin = new Padding(2);
btnRefreshMemory.Name = "btnRefreshMemory"; btnRefreshMemory.Name = "btnRefreshMemory";
btnRefreshMemory.Size = new Size(112, 34); btnRefreshMemory.Size = new Size(90, 27);
btnRefreshMemory.TabIndex = 14; btnRefreshMemory.TabIndex = 14;
btnRefreshMemory.Text = "Refresh Memory"; btnRefreshMemory.Text = "Refresh Memory";
btnRefreshMemory.UseVisualStyleBackColor = true; btnRefreshMemory.UseVisualStyleBackColor = true;
@@ -170,117 +170,109 @@
// //
// txtMemoryView // txtMemoryView
// //
txtMemoryView.Location = new Point(110, 101); txtMemoryView.Location = new Point(88, 81);
txtMemoryView.Margin = new Padding(2); txtMemoryView.Margin = new Padding(2);
txtMemoryView.Name = "txtMemoryView"; txtMemoryView.Name = "txtMemoryView";
txtMemoryView.Size = new Size(553, 543); txtMemoryView.Size = new Size(443, 435);
txtMemoryView.TabIndex = 15; txtMemoryView.TabIndex = 15;
txtMemoryView.Text = "Memory View Window"; txtMemoryView.Text = "Memory View Window";
// //
// lstDisassembly // lstDisassembly
// //
lstDisassembly.FormattingEnabled = true; lstDisassembly.FormattingEnabled = true;
lstDisassembly.ItemHeight = 25; lstDisassembly.Location = new Point(567, 8);
lstDisassembly.Location = new Point(709, 10);
lstDisassembly.Margin = new Padding(2); lstDisassembly.Margin = new Padding(2);
lstDisassembly.Name = "lstDisassembly"; lstDisassembly.Name = "lstDisassembly";
lstDisassembly.Size = new Size(314, 329); lstDisassembly.Size = new Size(252, 264);
lstDisassembly.TabIndex = 16; lstDisassembly.TabIndex = 16;
// //
// lstStack // lstStack
// //
lstStack.FormattingEnabled = true; lstStack.FormattingEnabled = true;
lstStack.ItemHeight = 25; lstStack.Location = new Point(823, 8);
lstStack.Location = new Point(1029, 10);
lstStack.Margin = new Padding(2); lstStack.Margin = new Padding(2);
lstStack.Name = "lstStack"; lstStack.Name = "lstStack";
lstStack.Size = new Size(162, 329); lstStack.Size = new Size(130, 264);
lstStack.TabIndex = 17; lstStack.TabIndex = 17;
// //
// label1 // label1
// //
label1.AutoSize = true; label1.AutoSize = true;
label1.Location = new Point(710, 372); label1.Location = new Point(568, 298);
label1.Margin = new Padding(4, 0, 4, 0);
label1.Name = "label1"; label1.Name = "label1";
label1.Size = new Size(97, 25); label1.Size = new Size(81, 20);
label1.TabIndex = 19; label1.TabIndex = 19;
label1.Text = "Breakpoint"; label1.Text = "Breakpoint";
// //
// txtBreakpoint // txtBreakpoint
// //
txtBreakpoint.Location = new Point(819, 369); txtBreakpoint.Location = new Point(655, 295);
txtBreakpoint.Margin = new Padding(4);
txtBreakpoint.Name = "txtBreakpoint"; txtBreakpoint.Name = "txtBreakpoint";
txtBreakpoint.Size = new Size(155, 31); txtBreakpoint.Size = new Size(125, 27);
txtBreakpoint.TabIndex = 20; txtBreakpoint.TabIndex = 20;
// //
// label2 // label2
// //
label2.AutoSize = true; label2.AutoSize = true;
label2.Location = new Point(291, 26); label2.Location = new Point(233, 21);
label2.Margin = new Padding(4, 0, 4, 0);
label2.Name = "label2"; label2.Name = "label2";
label2.Size = new Size(77, 25); label2.Size = new Size(62, 20);
label2.TabIndex = 21; label2.TabIndex = 21;
label2.Text = "Address"; label2.Text = "Address";
// //
// lblIX // lblIX
// //
lblIX.AutoSize = true; lblIX.AutoSize = true;
lblIX.Location = new Point(11, 372); lblIX.Location = new Point(9, 298);
lblIX.Margin = new Padding(2, 0, 2, 0); lblIX.Margin = new Padding(2, 0, 2, 0);
lblIX.Name = "lblIX"; lblIX.Name = "lblIX";
lblIX.Size = new Size(28, 25); lblIX.Size = new Size(22, 20);
lblIX.TabIndex = 22; lblIX.TabIndex = 22;
lblIX.Text = "IX"; lblIX.Text = "IX";
// //
// lblIY // lblIY
// //
lblIY.AutoSize = true; lblIY.AutoSize = true;
lblIY.Location = new Point(12, 430); lblIY.Location = new Point(10, 344);
lblIY.Margin = new Padding(2, 0, 2, 0); lblIY.Margin = new Padding(2, 0, 2, 0);
lblIY.Name = "lblIY"; lblIY.Name = "lblIY";
lblIY.Size = new Size(27, 25); lblIY.Size = new Size(21, 20);
lblIY.TabIndex = 23; lblIY.TabIndex = 23;
lblIY.Text = "IY"; lblIY.Text = "IY";
// //
// lblIff1 // lblIff1
// //
lblIff1.AutoSize = true; lblIff1.AutoSize = true;
lblIff1.Location = new Point(11, 533); lblIff1.Location = new Point(9, 426);
lblIff1.Margin = new Padding(4, 0, 4, 0);
lblIff1.Name = "lblIff1"; lblIff1.Name = "lblIff1";
lblIff1.Size = new Size(45, 25); lblIff1.Size = new Size(35, 20);
lblIff1.TabIndex = 24; lblIff1.TabIndex = 24;
lblIff1.Text = "IFF1"; lblIff1.Text = "IFF1";
// //
// lblIff2 // lblIff2
// //
lblIff2.AutoSize = true; lblIff2.AutoSize = true;
lblIff2.Location = new Point(11, 586); lblIff2.Location = new Point(9, 469);
lblIff2.Margin = new Padding(4, 0, 4, 0);
lblIff2.Name = "lblIff2"; lblIff2.Name = "lblIff2";
lblIff2.Size = new Size(45, 25); lblIff2.Size = new Size(35, 20);
lblIff2.TabIndex = 25; lblIff2.TabIndex = 25;
lblIff2.Text = "IFF2"; lblIff2.Text = "IFF2";
// //
// lblIE // lblIE
// //
lblIE.AutoSize = true; lblIE.AutoSize = true;
lblIE.Location = new Point(11, 486); lblIE.Location = new Point(9, 389);
lblIE.Margin = new Padding(4, 0, 4, 0);
lblIE.Name = "lblIE"; lblIE.Name = "lblIE";
lblIE.Size = new Size(33, 25); lblIE.Size = new Size(26, 20);
lblIE.TabIndex = 26; lblIE.TabIndex = 26;
lblIE.Text = "IM"; lblIE.Text = "IM";
// //
// btnReset // btnReset
// //
btnReset.Location = new Point(814, 409); btnReset.Location = new Point(651, 327);
btnReset.Margin = new Padding(2); btnReset.Margin = new Padding(2);
btnReset.Name = "btnReset"; btnReset.Name = "btnReset";
btnReset.Size = new Size(165, 34); btnReset.Size = new Size(132, 27);
btnReset.TabIndex = 27; btnReset.TabIndex = 27;
btnReset.Text = "Set Breakpoint"; btnReset.Text = "Set Breakpoint";
btnReset.UseVisualStyleBackColor = true; btnReset.UseVisualStyleBackColor = true;
@@ -295,61 +287,58 @@
// lblFrames // lblFrames
// //
lblFrames.AutoSize = true; lblFrames.AutoSize = true;
lblFrames.Location = new Point(14, 660); lblFrames.Location = new Point(11, 528);
lblFrames.Margin = new Padding(2, 0, 2, 0); lblFrames.Margin = new Padding(2, 0, 2, 0);
lblFrames.Name = "lblFrames"; lblFrames.Name = "lblFrames";
lblFrames.Size = new Size(149, 25); lblFrames.Size = new Size(124, 20);
lblFrames.TabIndex = 28; lblFrames.TabIndex = 28;
lblFrames.Text = "Frames Rendered"; lblFrames.Text = "Frames Rendered";
// //
// lblFPS // lblFPS
// //
lblFPS.AutoSize = true; lblFPS.AutoSize = true;
lblFPS.Location = new Point(129, 757); lblFPS.Location = new Point(103, 606);
lblFPS.Margin = new Padding(2, 0, 2, 0); lblFPS.Margin = new Padding(2, 0, 2, 0);
lblFPS.Name = "lblFPS"; lblFPS.Name = "lblFPS";
lblFPS.Size = new Size(41, 25); lblFPS.Size = new Size(32, 20);
lblFPS.TabIndex = 29; lblFPS.TabIndex = 29;
lblFPS.Text = "FPS"; lblFPS.Text = "FPS";
// //
// lblFrameTime // lblFrameTime
// //
lblFrameTime.AutoSize = true; lblFrameTime.AutoSize = true;
lblFrameTime.Location = new Point(60, 706); lblFrameTime.Location = new Point(48, 565);
lblFrameTime.Margin = new Padding(2, 0, 2, 0); lblFrameTime.Margin = new Padding(2, 0, 2, 0);
lblFrameTime.Name = "lblFrameTime"; lblFrameTime.Name = "lblFrameTime";
lblFrameTime.Size = new Size(104, 25); lblFrameTime.Size = new Size(87, 20);
lblFrameTime.TabIndex = 30; lblFrameTime.TabIndex = 30;
lblFrameTime.Text = "Frame Time"; lblFrameTime.Text = "Frame Time";
// //
// richTextBox1 // richTextBox1
// //
richTextBox1.Enabled = false; richTextBox1.Enabled = false;
richTextBox1.Location = new Point(682, 474); richTextBox1.Location = new Point(546, 379);
richTextBox1.Margin = new Padding(4);
richTextBox1.Name = "richTextBox1"; richTextBox1.Name = "richTextBox1";
richTextBox1.ReadOnly = true; richTextBox1.ReadOnly = true;
richTextBox1.Size = new Size(379, 159); richTextBox1.Size = new Size(304, 128);
richTextBox1.TabIndex = 32; richTextBox1.TabIndex = 32;
richTextBox1.Text = "Sega Master System Memory Map:\n0x0000 - 0x3FFF: ROM Slot 0 (16KB)\n0x4000 - 0x7FFF: ROM Slot 1 (16KB)\n0x8000 - 0xBFFF: ROM Slot 2 (16KB)\n0xC000 - 0xDFFF: System RAM (8KB)\n0xE000 - 0xFFFF: RAM Mirror"; richTextBox1.Text = "Sega Master System Memory Map:\n0x0000 - 0x3FFF: ROM Slot 0 (16KB)\n0x4000 - 0x7FFF: ROM Slot 1 (16KB)\n0x8000 - 0xBFFF: ROM Slot 2 (16KB)\n0xC000 - 0xDFFF: System RAM (8KB)\n0xE000 - 0xFFFF: RAM Mirror";
// //
// button1 // btnCpuStep
// //
button1.Location = new Point(1075, 756); btnCpuStep.Location = new Point(860, 605);
button1.Margin = new Padding(4); btnCpuStep.Name = "btnCpuStep";
button1.Name = "button1"; btnCpuStep.Size = new Size(94, 29);
button1.Size = new Size(118, 36); btnCpuStep.TabIndex = 33;
button1.TabIndex = 33; btnCpuStep.Text = "CPU Step";
button1.Text = "CPU Step"; btnCpuStep.UseVisualStyleBackColor = true;
button1.UseVisualStyleBackColor = true; btnCpuStep.Click += btnStep_Click;
button1.Click += btnStep_Click;
// //
// CpuRun // CpuRun
// //
CpuRun.Location = new Point(943, 757); CpuRun.Location = new Point(754, 606);
CpuRun.Margin = new Padding(4);
CpuRun.Name = "CpuRun"; CpuRun.Name = "CpuRun";
CpuRun.Size = new Size(118, 36); CpuRun.Size = new Size(94, 29);
CpuRun.TabIndex = 34; CpuRun.TabIndex = 34;
CpuRun.Text = "CPU Run"; CpuRun.Text = "CPU Run";
CpuRun.UseVisualStyleBackColor = true; CpuRun.UseVisualStyleBackColor = true;
@@ -361,57 +350,63 @@
groupBox1.Controls.Add(lblTone2); groupBox1.Controls.Add(lblTone2);
groupBox1.Controls.Add(lblNoise); groupBox1.Controls.Add(lblNoise);
groupBox1.Controls.Add(lblTone0); groupBox1.Controls.Add(lblTone0);
groupBox1.Location = new Point(266, 658); groupBox1.Location = new Point(213, 526);
groupBox1.Margin = new Padding(2, 2, 2, 2);
groupBox1.Name = "groupBox1"; groupBox1.Name = "groupBox1";
groupBox1.Size = new Size(397, 222); groupBox1.Padding = new Padding(2, 2, 2, 2);
groupBox1.Size = new Size(318, 178);
groupBox1.TabIndex = 35; groupBox1.TabIndex = 35;
groupBox1.TabStop = false; groupBox1.TabStop = false;
groupBox1.Text = "Audio (SN76489)"; groupBox1.Text = "Audio (SN76489)";
// //
// lblTone0 // lblTone1
// //
lblTone0.AutoSize = true; lblTone1.AutoSize = true;
lblTone0.Location = new Point(25, 48); lblTone1.Location = new Point(20, 66);
lblTone0.Name = "lblTone0"; lblTone1.Margin = new Padding(2, 0, 2, 0);
lblTone0.Size = new Size(59, 25); lblTone1.Name = "lblTone1";
lblTone0.TabIndex = 0; lblTone1.Size = new Size(49, 20);
lblTone0.Text = "Tone0"; lblTone1.TabIndex = 3;
// lblTone1.Text = "Tone1";
// lblNoise
//
lblNoise.AutoSize = true;
lblNoise.Location = new Point(25, 160);
lblNoise.Name = "lblNoise";
lblNoise.Size = new Size(57, 25);
lblNoise.TabIndex = 1;
lblNoise.Text = "Noise";
// //
// lblTone2 // lblTone2
// //
lblTone2.AutoSize = true; lblTone2.AutoSize = true;
lblTone2.Location = new Point(25, 122); lblTone2.Location = new Point(20, 98);
lblTone2.Margin = new Padding(2, 0, 2, 0);
lblTone2.Name = "lblTone2"; lblTone2.Name = "lblTone2";
lblTone2.Size = new Size(59, 25); lblTone2.Size = new Size(49, 20);
lblTone2.TabIndex = 2; lblTone2.TabIndex = 2;
lblTone2.Text = "Tone2"; lblTone2.Text = "Tone2";
// //
// lblTone1 // lblNoise
// //
lblTone1.AutoSize = true; lblNoise.AutoSize = true;
lblTone1.Location = new Point(25, 83); lblNoise.Location = new Point(20, 128);
lblTone1.Name = "lblTone1"; lblNoise.Margin = new Padding(2, 0, 2, 0);
lblTone1.Size = new Size(59, 25); lblNoise.Name = "lblNoise";
lblTone1.TabIndex = 3; lblNoise.Size = new Size(47, 20);
lblTone1.Text = "Tone1"; lblNoise.TabIndex = 1;
lblNoise.Text = "Noise";
//
// lblTone0
//
lblTone0.AutoSize = true;
lblTone0.Location = new Point(20, 38);
lblTone0.Margin = new Padding(2, 0, 2, 0);
lblTone0.Name = "lblTone0";
lblTone0.Size = new Size(49, 20);
lblTone0.TabIndex = 0;
lblTone0.Text = "Tone0";
// //
// DebuggerForm // DebuggerForm
// //
AutoScaleDimensions = new SizeF(10F, 25F); AutoScaleDimensions = new SizeF(8F, 20F);
AutoScaleMode = AutoScaleMode.Font; AutoScaleMode = AutoScaleMode.Font;
ClientSize = new Size(1206, 892); ClientSize = new Size(965, 714);
Controls.Add(groupBox1); Controls.Add(groupBox1);
Controls.Add(CpuRun); Controls.Add(CpuRun);
Controls.Add(button1); Controls.Add(btnCpuStep);
Controls.Add(richTextBox1); Controls.Add(richTextBox1);
Controls.Add(lblFrameTime); Controls.Add(lblFrameTime);
Controls.Add(lblFPS); Controls.Add(lblFPS);
@@ -475,7 +470,7 @@
private Label lblFPS; private Label lblFPS;
private Label lblFrameTime; private Label lblFrameTime;
private RichTextBox richTextBox1; private RichTextBox richTextBox1;
private Button button1; private Button btnCpuStep;
private Button CpuRun; private Button CpuRun;
public System.Windows.Forms.Timer uiUpdateTimer; public System.Windows.Forms.Timer uiUpdateTimer;
private GroupBox groupBox1; private GroupBox groupBox1;

6
Desktop/DebuggerForm.cs
View File

@@ -27,6 +27,7 @@ namespace Desktop
UpdateStackView(); UpdateStackView();
UpdateDisassemblyView(); UpdateDisassemblyView();
_mainForm = mainForm; _mainForm = mainForm;
CpuRun.Text = _mainForm.IsRunning ? "CPU Stop" : "CPU Run";
} }
private void CpuRun_Click(object sender, EventArgs e) private void CpuRun_Click(object sender, EventArgs e)
@@ -35,7 +36,6 @@ namespace Desktop
{ {
// Stop the machine // Stop the machine
_mainForm.StopEmulator(); _mainForm.StopEmulator();
CpuRun.Text = "CPU Run";
// Stop the live UI updates and do one final manual refresh // Stop the live UI updates and do one final manual refresh
uiUpdateTimer.Stop(); uiUpdateTimer.Stop();
@@ -45,12 +45,12 @@ namespace Desktop
{ {
// Start the machine // Start the machine
_mainForm.StartEmulator(); _mainForm.StartEmulator();
CpuRun.Text = "CPU Stop";
// Start the timer so the debugger screen updates automatically // Start the timer so the debugger screen updates automatically
// (Make sure your uiUpdateTimer Interval in the designer is set to something like 100ms) // (Make sure your uiUpdateTimer Interval in the designer is set to something like 100ms)
uiUpdateTimer.Start(); uiUpdateTimer.Start();
} }
CpuRun.Text = _mainForm.IsRunning ? "CPU Stop" : "CPU Run";
} }
private void btnStep_Click(object sender, EventArgs e) private void btnStep_Click(object sender, EventArgs e)
@@ -92,6 +92,8 @@ namespace Desktop
// Current Emulator State // Current Emulator State
private void UpdateDisplay() private void UpdateDisplay()
{ {
CpuRun.Text = _mainForm.IsRunning ? "CPU Stop" : "CPU Run";
btnCpuStep.Enabled = _mainForm.IsRunning ? false : true;
lblAF.Text = $"AF: {_cpu.AF.Word:X4}"; lblAF.Text = $"AF: {_cpu.AF.Word:X4}";
lblBC.Text = $"BC: {_cpu.BC.Word:X4}"; lblBC.Text = $"BC: {_cpu.BC.Word:X4}";
lblDE.Text = $"DE: {_cpu.DE.Word:X4}"; lblDE.Text = $"DE: {_cpu.DE.Word:X4}";

47
Desktop/Form1.Designer.cs generated
View File

@@ -32,6 +32,8 @@
fileToolStripMenuItem = new ToolStripMenuItem(); fileToolStripMenuItem = new ToolStripMenuItem();
openToolStripMenuItem = new ToolStripMenuItem(); openToolStripMenuItem = new ToolStripMenuItem();
includedToolStripMenuItem = new ToolStripMenuItem(); includedToolStripMenuItem = new ToolStripMenuItem();
masterSystemToolStripMenuItem = new ToolStripMenuItem();
gameGearToolStripMenuItem = new ToolStripMenuItem();
selectROMToolStripMenuItem1 = new ToolStripMenuItem(); selectROMToolStripMenuItem1 = new ToolStripMenuItem();
exitToolStripMenuItem = new ToolStripMenuItem(); exitToolStripMenuItem = new ToolStripMenuItem();
viewToolStripMenuItem = new ToolStripMenuItem(); viewToolStripMenuItem = new ToolStripMenuItem();
@@ -44,8 +46,6 @@
turboModeToolStripMenuItem = new ToolStripMenuItem(); turboModeToolStripMenuItem = new ToolStripMenuItem();
helpToolStripMenuItem = new ToolStripMenuItem(); helpToolStripMenuItem = new ToolStripMenuItem();
aboutToolStripMenuItem = new ToolStripMenuItem(); aboutToolStripMenuItem = new ToolStripMenuItem();
masterSystemToolStripMenuItem = new ToolStripMenuItem();
gameGearToolStripMenuItem = new ToolStripMenuItem();
menuStrip1.SuspendLayout(); menuStrip1.SuspendLayout();
SuspendLayout(); SuspendLayout();
// //
@@ -71,27 +71,39 @@
// //
openToolStripMenuItem.DropDownItems.AddRange(new ToolStripItem[] { includedToolStripMenuItem, selectROMToolStripMenuItem1 }); openToolStripMenuItem.DropDownItems.AddRange(new ToolStripItem[] { includedToolStripMenuItem, selectROMToolStripMenuItem1 });
openToolStripMenuItem.Name = "openToolStripMenuItem"; openToolStripMenuItem.Name = "openToolStripMenuItem";
openToolStripMenuItem.Size = new Size(224, 26); openToolStripMenuItem.Size = new Size(128, 26);
openToolStripMenuItem.Text = "Open"; openToolStripMenuItem.Text = "Open";
// //
// includedToolStripMenuItem // includedToolStripMenuItem
// //
includedToolStripMenuItem.DropDownItems.AddRange(new ToolStripItem[] { masterSystemToolStripMenuItem, gameGearToolStripMenuItem }); includedToolStripMenuItem.DropDownItems.AddRange(new ToolStripItem[] { masterSystemToolStripMenuItem, gameGearToolStripMenuItem });
includedToolStripMenuItem.Name = "includedToolStripMenuItem"; includedToolStripMenuItem.Name = "includedToolStripMenuItem";
includedToolStripMenuItem.Size = new Size(224, 26); includedToolStripMenuItem.Size = new Size(178, 26);
includedToolStripMenuItem.Text = "Included"; includedToolStripMenuItem.Text = "Included";
// //
// masterSystemToolStripMenuItem
//
masterSystemToolStripMenuItem.Name = "masterSystemToolStripMenuItem";
masterSystemToolStripMenuItem.Size = new Size(188, 26);
masterSystemToolStripMenuItem.Text = "Master System";
//
// gameGearToolStripMenuItem
//
gameGearToolStripMenuItem.Name = "gameGearToolStripMenuItem";
gameGearToolStripMenuItem.Size = new Size(188, 26);
gameGearToolStripMenuItem.Text = "Game Gear";
//
// selectROMToolStripMenuItem1 // selectROMToolStripMenuItem1
// //
selectROMToolStripMenuItem1.Name = "selectROMToolStripMenuItem1"; selectROMToolStripMenuItem1.Name = "selectROMToolStripMenuItem1";
selectROMToolStripMenuItem1.Size = new Size(224, 26); selectROMToolStripMenuItem1.Size = new Size(178, 26);
selectROMToolStripMenuItem1.Text = "Select ROM..."; selectROMToolStripMenuItem1.Text = "Select ROM...";
selectROMToolStripMenuItem1.Click += selectROMToolStripMenuItem_Click; selectROMToolStripMenuItem1.Click += selectROMToolStripMenuItem_Click;
// //
// exitToolStripMenuItem // exitToolStripMenuItem
// //
exitToolStripMenuItem.Name = "exitToolStripMenuItem"; exitToolStripMenuItem.Name = "exitToolStripMenuItem";
exitToolStripMenuItem.Size = new Size(224, 26); exitToolStripMenuItem.Size = new Size(128, 26);
exitToolStripMenuItem.Text = "Exit"; exitToolStripMenuItem.Text = "Exit";
exitToolStripMenuItem.Click += exitToolStripMenuItem_Click; exitToolStripMenuItem.Click += exitToolStripMenuItem_Click;
// //
@@ -126,28 +138,28 @@
// resetToolStripMenuItem // resetToolStripMenuItem
// //
resetToolStripMenuItem.Name = "resetToolStripMenuItem"; resetToolStripMenuItem.Name = "resetToolStripMenuItem";
resetToolStripMenuItem.Size = new Size(224, 26); resetToolStripMenuItem.Size = new Size(174, 26);
resetToolStripMenuItem.Text = "Reset"; resetToolStripMenuItem.Text = "Reset";
resetToolStripMenuItem.Click += resetToolStripMenuItem_Click; resetToolStripMenuItem.Click += resetToolStripMenuItem_Click;
// //
// saveStateToolStripMenuItem // saveStateToolStripMenuItem
// //
saveStateToolStripMenuItem.Name = "saveStateToolStripMenuItem"; saveStateToolStripMenuItem.Name = "saveStateToolStripMenuItem";
saveStateToolStripMenuItem.Size = new Size(224, 26); saveStateToolStripMenuItem.Size = new Size(174, 26);
saveStateToolStripMenuItem.Text = "Save State"; saveStateToolStripMenuItem.Text = "Save State";
saveStateToolStripMenuItem.Click += saveStateToolStripMenuItem_Click; saveStateToolStripMenuItem.Click += saveStateToolStripMenuItem_Click;
// //
// loadStateToolStripMenuItem // loadStateToolStripMenuItem
// //
loadStateToolStripMenuItem.Name = "loadStateToolStripMenuItem"; loadStateToolStripMenuItem.Name = "loadStateToolStripMenuItem";
loadStateToolStripMenuItem.Size = new Size(224, 26); loadStateToolStripMenuItem.Size = new Size(174, 26);
loadStateToolStripMenuItem.Text = "Load State"; loadStateToolStripMenuItem.Text = "Load State";
loadStateToolStripMenuItem.Click += loadStateToolStripMenuItem_Click; loadStateToolStripMenuItem.Click += loadStateToolStripMenuItem_Click;
// //
// turboModeToolStripMenuItem // turboModeToolStripMenuItem
// //
turboModeToolStripMenuItem.Name = "turboModeToolStripMenuItem"; turboModeToolStripMenuItem.Name = "turboModeToolStripMenuItem";
turboModeToolStripMenuItem.Size = new Size(224, 26); turboModeToolStripMenuItem.Size = new Size(174, 26);
turboModeToolStripMenuItem.Text = "Turbo Mode"; turboModeToolStripMenuItem.Text = "Turbo Mode";
turboModeToolStripMenuItem.Click += turboModeToolStripMenuItem_Click; turboModeToolStripMenuItem.Click += turboModeToolStripMenuItem_Click;
// //
@@ -161,20 +173,9 @@
// aboutToolStripMenuItem // aboutToolStripMenuItem
// //
aboutToolStripMenuItem.Name = "aboutToolStripMenuItem"; aboutToolStripMenuItem.Name = "aboutToolStripMenuItem";
aboutToolStripMenuItem.Size = new Size(133, 26); aboutToolStripMenuItem.Size = new Size(224, 26);
aboutToolStripMenuItem.Text = "About"; aboutToolStripMenuItem.Text = "About";
// aboutToolStripMenuItem.Click += aboutToolStripMenuItem_Click;
// masterSystemToolStripMenuItem
//
masterSystemToolStripMenuItem.Name = "masterSystemToolStripMenuItem";
masterSystemToolStripMenuItem.Size = new Size(224, 26);
masterSystemToolStripMenuItem.Text = "Master System";
//
// gameGearToolStripMenuItem
//
gameGearToolStripMenuItem.Name = "gameGearToolStripMenuItem";
gameGearToolStripMenuItem.Size = new Size(224, 26);
gameGearToolStripMenuItem.Text = "Game Gear";
// //
// ParsonsForm1 // ParsonsForm1
// //

107
Desktop/Form1.cs
View File

@@ -59,6 +59,7 @@ namespace Desktop
_machine = new SmsMachine(); _machine = new SmsMachine();
_audioPlayer = new NAudioPlayer(); _audioPlayer = new NAudioPlayer();
_machine.AudioProcessor.AudioDevice = _audioPlayer; _machine.AudioProcessor.AudioDevice = _audioPlayer;
IsRunning = false;
PopulateIncludedRomsMenu(); PopulateIncludedRomsMenu();
} }
@@ -253,50 +254,51 @@ namespace Desktop
{ {
IsRunning = false; IsRunning = false;
} }
private async void LoadRomAndStart(string filePath)
private async void LoadRomDataAndStart(byte[] romData, string fileName, string uniqueId)
{ {
StopEmulator(); StopEmulator();
if (_emulatorTask != null) if (_emulatorTask != null)
{ {
await _emulatorTask; await _emulatorTask;
} }
_romType = Path.GetExtension(filePath);
if (_romType == ".sms")
{
_machine.VideoProcessor.IsGameGear = false;
}
else if (_romType == ".gg")
{
_machine.VideoProcessor.IsGameGear = true;
}
else
throw new Exception("Incorrect ROM Type!");
_romType = _machine.VideoProcessor.IsGameGear ? "GG" : "SMS";
// 1. SAVE THE PREVIOUS GAME!
SaveCurrentSram(); SaveCurrentSram();
// 2. Load the file // Blast the bytes straight into the virtual cartridge slot!
byte[] rom = File.ReadAllBytes(filePath); _machine.LoadCartridge(romData);
// 3. Jam it into the Sega Mapper // Check the hardware mode based on the file name
_machine.LoadCartridge(rom); bool isGG = fileName.EndsWith(".gg", StringComparison.OrdinalIgnoreCase);
_machine.VideoProcessor.IsGameGear = isGG;
// 4. Update the path tracking // We use uniqueId to track the SRAM file path (works for both real paths and resource names)
_currentRomPath = filePath; _currentRomPath = uniqueId;
_currentRomName = Path.GetFileNameWithoutExtension(filePath); _currentRomName = Path.GetFileNameWithoutExtension(fileName);
//this.Text = $"{_romType} Parsons Master System 2026 - {_currentRomName}";
// Update the window title dynamically
_romType = isGG ? "GG" : "MS";
this.Text = $"{_romType} Parsons Master System 2026 - {_currentRomName}";
// 5. LOAD THE NEW SAVE DATA FROM THE EXE FOLDER!
string savPath = GetSaveFilePath(); string savPath = GetSaveFilePath();
if (savPath != null) if (savPath != null)
{ {
_machine.MemoryBus.LoadSaveData(savPath); _machine.MemoryBus.LoadSaveData(savPath);
} }
// 6. Turn the power on!
StartEmulator(); StartEmulator();
} }
private void LoadRomAndStart(string filePath)
{
if (!File.Exists(filePath)) return;
// Read from the hard drive, then pass to the universal loader
byte[] romData = File.ReadAllBytes(filePath);
LoadRomDataAndStart(romData, Path.GetFileName(filePath), filePath);
}
private string GetSaveFilePath() private string GetSaveFilePath()
{ {
// Don't try to save if a game hasn't been loaded yet! // Don't try to save if a game hasn't been loaded yet!
@@ -339,7 +341,7 @@ namespace Desktop
ToolStripMenuItem romMenuItem = new ToolStripMenuItem(menuName); ToolStripMenuItem romMenuItem = new ToolStripMenuItem(menuName);
// 3. Point the click event to our new extraction helper! // 3. Point the click event to our new extraction helper!
romMenuItem.Click += (sender, e) => ExtractAndLoadEmbeddedRom(resourceName); romMenuItem.Click += (sender, e) => LoadEmbeddedRom(resourceName);
// 4. Sort into the correct menu based on extension! // 4. Sort into the correct menu based on extension!
if (resourceName.EndsWith(".gg", StringComparison.OrdinalIgnoreCase)) if (resourceName.EndsWith(".gg", StringComparison.OrdinalIgnoreCase))
@@ -353,32 +355,28 @@ namespace Desktop
} }
} }
private void ExtractAndLoadEmbeddedRom(string resourceName) private void LoadEmbeddedRom(string resourceName)
{ {
// 1. Strip off the ugly "Desktop.ROMS." prefix to get the real file name // 1. Strip off the ugly prefix to get the real file name for the UI and the .gg check
string cleanFileName = resourceName.Replace("Desktop.ROMS.", ""); string cleanFileName = resourceName.Replace("Desktop.ROMS.", "");
// 2. Create a physical path right next to your emulator .exe
string physicalPath = Path.Combine(Application.StartupPath, cleanFileName);
// 3. If we haven't extracted this game yet, extract it now!
if (!File.Exists(physicalPath))
{
Assembly assembly = Assembly.GetExecutingAssembly(); Assembly assembly = Assembly.GetExecutingAssembly();
#pragma warning disable CS8600 // Converting null literal or possible null value to non-nullable type.
// 2. Open a direct pipe to the internal resource
using (Stream stream = assembly.GetManifestResourceStream(resourceName)) using (Stream stream = assembly.GetManifestResourceStream(resourceName))
{ {
if (stream == null) return; if (stream == null) return;
using (FileStream fileStream = new FileStream(physicalPath, FileMode.Create))
{
stream.CopyTo(fileStream);
}
}
#pragma warning restore CS8600 // Converting null literal or possible null value to non-nullable type.
}
// 4. Now that it is a REAL file on the hard drive, pass it to your normal loader! // 3. Copy the stream entirely in RAM—never touching the hard drive!
LoadRomAndStart(physicalPath); using (MemoryStream ms = new MemoryStream())
{
stream.CopyTo(ms);
byte[] romData = ms.ToArray();
// 4. Pass the raw bytes to our universal loader
LoadRomDataAndStart(romData, cleanFileName, resourceName);
}
}
} }
public static string[] GetFilesInResourceDirectory(string directoryPrefix) public static string[] GetFilesInResourceDirectory(string directoryPrefix)
@@ -532,5 +530,28 @@ namespace Desktop
turboModeToolStripMenuItem.Checked = !turboModeToolStripMenuItem.Checked; turboModeToolStripMenuItem.Checked = !turboModeToolStripMenuItem.Checked;
isTurboMode = turboModeToolStripMenuItem.Checked ? true : false; isTurboMode = turboModeToolStripMenuItem.Checked ? true : false;
} }
private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
{
MessageBox.Show(
$"First full release of Parsons Master System Emulator 2026!\r\n\r\nFeatures (v1.0):\r\n\r\n" +
$" *Full compatibility with all Master System and Game Gear ROMs\r\n" +
$" *Full window scaling with fixed aspect ratio (SMS & GG)\r\n" +
$" *Full 4 channel SN76489 implememtation using NAudio\r\n" +
$" *SRAM auto save and load (Battery Backed RAM)\r\n" +
$" *Keyboard and XInput control pad support\r\n" +
$" *Comprehensive Debugger\r\n" +
$" *VRAM Viewer\r\n" +
$" *Single point Save State\r\n" +
$" *Turbo mode\r\n" +
$" *Includes a selection of commercial ROMs\r\n\r\n" +
$"Planned updates (v1.1):\r\n\r\n" +
$" *Architectural double buffering (prevent screen tear)\r\n" +
$" *Graphics shaders (scanlines etc...)\r\n" +
$" *Add multiple Save States per game\r\n\r\n\r\n" +
$"(c) Marc Parsons 2026","Parsons Master System 2026 v1.0",
MessageBoxButtons.OK,
MessageBoxIcon.Information);
}
} }
} }