Failed attempt to implement mapper 134

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

@@ -676,6 +676,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper115.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper121.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper123.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper134.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper165.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper182.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper189.cs" />

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper134.cs

@@ -0,0 +1,49 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	public sealed class Mapper134 : MMC3Board_Base
+	{
+		private byte reg;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER134":
+					break;
+				default:
+					return false;
+			}
+
+			BaseSetup();
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("reg", ref reg);
+		}
+
+		public override void WriteWRAM(int addr, byte value)
+		{
+			if (addr == 1) // 0x6001
+			{
+				reg = value;
+			}
+
+			base.WriteWRAM(addr, value);
+		}
+
+		protected override int Get_PRGBank_8K(int addr)
+		{
+			return base.Get_PRGBank_8K(addr) | ((reg & 0x2) << 4);
+		}
+
+		protected override int Get_CHRBank_1K(int addr)
+		{
+			return base.Get_CHRBank_1K(addr) | ((reg & 0x20) << 3);
+		}
+	}
+}