NEShawk - implement mapper 202

BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj

@@ -545,6 +545,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper193.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper200.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper201.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper202.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper203.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper218.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper222.cs" />

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper202.cs

@@ -0,0 +1,61 @@
+using BizHawk.Common;
+using BizHawk.Common.NumberExtensions;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	// 150-in-1
+	// http://wiki.nesdev.com/w/index.php/INES_Mapper_202
+	public class Mapper202 : NES.NESBoardBase
+	{
+		private int _reg;
+		private bool _isprg32KMode;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER202":
+					break;
+				default:
+					return false;
+			}
+
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("reg", ref _reg);
+			ser.Sync("isPrg32kMode", ref _isprg32KMode);
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			_reg = (addr >> 1) & 7;
+			_isprg32KMode = addr.Bit(0) && addr.Bit(3);
+
+			SetMirrorType(addr.Bit(0) ? EMirrorType.Horizontal : EMirrorType.Vertical);
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			if (_isprg32KMode)
+			{
+				return ROM[((_reg >> 1) * 0x8000) + (addr & 0x7FFF)];
+			}
+			
+			return ROM[(_reg * 0x4000) + (addr & 0x3FFF)];
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				return VROM[(_reg * 0x2000) + (addr & 0x1FFF)];
+			}
+
+			return base.ReadPPU(addr);
+		}
+	}
+}