From 9054f56f52e829fe9f787403470ef7b30375c288 Mon Sep 17 00:00:00 2001
From: adelikat <adelikat@tasvideos.org>
Date: Wed, 19 Aug 2015 20:17:59 -0400
Subject: [PATCH] NesHawk - implement mapper 136

---
 .../BizHawk.Emulation.Cores.csproj            |  1 +
 .../Consoles/Nintendo/NES/Boards/Mapper136.cs | 75 +++++++++++++++++++
 2 files changed, 76 insertions(+)
 create mode 100644 BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper136.cs

diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index e2030d95d1..0c26ffa910 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/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" />
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper136.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper136.cs
new file mode 100644
index 0000000000..c7408848c8
--- /dev/null
+++ b/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);
+		}
+	}
+}