NesHawk - implement mapper 136

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

@@ -531,6 +531,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper116.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper120.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper132.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper136.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper143.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper156.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper164.cs" />

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper136.cs

@@ -0,0 +1,75 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	// Mei Loi Siu Ji (Metal Fighter) (Sachen) [!]
+	public sealed class Mapper136 : NES.NESBoardBase
+	{
+		private int _chrBankMask_8k;
+		private int _chrRegister;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			//configure
+			switch (Cart.board_type)
+			{
+				case "MAPPER136":
+					break;
+				default:
+					return false;
+			}
+
+			_chrBankMask_8k = Cart.chr_size / 8 - 1;
+			return true;
+		}
+
+		public override void WriteEXP(int addr, byte value)
+		{
+			if ((addr & 0x103) == 0x102)
+			{
+				_chrRegister = value + 3;
+			}
+			else
+			{
+				base.WriteEXP(addr, value);
+			}
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			if ((addr & 0x103) == 0x102)
+			{
+				_chrRegister = value + 3;
+			}
+		}
+
+		public override byte ReadEXP(int addr)
+		{
+			if (addr == 0x100)
+			{
+				return (byte)((_chrRegister & 0x3F) | (NES.DB & 0xC0));
+			}
+			else
+			{
+				return base.ReadEXP(addr);
+			}
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				int bank = _chrRegister & _chrBankMask_8k;
+				return VROM[(bank * 0x2000) + (addr & 0x1FFF)];
+			}
+
+			return base.ReadPPU(addr);
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("chrRegister", ref _chrRegister);
+		}
+	}
+}