diff --git a/BizHawk.Emulation/BizHawk.Emulation.csproj b/BizHawk.Emulation/BizHawk.Emulation.csproj
index 0e34513b07..99e1888f05 100644
--- a/BizHawk.Emulation/BizHawk.Emulation.csproj
+++ b/BizHawk.Emulation/BizHawk.Emulation.csproj
@@ -183,6 +183,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper62.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper91.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MLT-ACTION52.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\MLT-MAX15.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\HKROM.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper012.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\MMC3_family\Mapper044.cs" />
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MLT-MAX15.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MLT-MAX15.cs
new file mode 100644
index 0000000000..e53bdc98d5
--- /dev/null
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MLT-MAX15.cs
@@ -0,0 +1,153 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	class MLT_MAX15 : NES.NESBoardBase
+	{
+		//http://wiki.nesdev.com/w/index.php/INES_Mapper_234
+
+		bool mode = false;
+		int block_high = 0;
+		int block_low = 0;
+		byte prg_bank = 0;
+		byte chr_bank_high = 0;
+		byte chr_bank_low = 0;
+		int prg_bank_mask_32k = 0;
+		int chr_bank_mask_8k = 0;
+		bool reg_0_locked = false;
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER234":
+				case "MLT-MAXI15":
+					break;
+				default:
+					return false;
+			}
+
+			prg_bank_mask_32k = Cart.prg_size / 32 - 1;
+			chr_bank_mask_8k = Cart.chr_size / 8 - 1;
+
+			return true;
+		}
+
+		public override void NESSoftReset()
+		{
+			mode = false;
+			block_high = 0;
+			block_low = 0;
+			prg_bank = 0;
+			chr_bank_high = 0;
+			reg_0_locked = false;
+			base.NESSoftReset();
+			SetMirrorType(EMirrorType.Vertical);
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("mode", ref mode);
+			ser.Sync("block_high", ref block_high);
+			ser.Sync("block_low", ref block_low);
+			ser.Sync("prg_bank", ref prg_bank);
+			ser.Sync("chr_bank", ref chr_bank_high);
+			ser.Sync("reg_0_locked", ref reg_0_locked);
+			base.SyncState(ser);
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			if (addr < 0x7F80)
+			{
+				base.WritePRG(addr, value);
+			}
+			else
+			{
+				switch (addr & 0x7FF8)
+				{
+					case 0x7F80:
+					case 0x7F88:
+					case 0x7F90:
+					case 0x7F98:
+						if (!reg_0_locked)
+						{
+							if (value > 0)
+							{
+								reg_0_locked = true;
+							}
+							block_high = (value >> 1) & 0x07;
+							block_low = value & 0x01;
+							mode = value.Bit(6);
+							if (value.Bit(7))
+							{
+								SetMirrorType(EMirrorType.Horizontal);
+							}
+							else
+							{
+								SetMirrorType(EMirrorType.Vertical);
+							}
+						}
+						break;
+					case 0x7FC0:
+					case 0x7FC8:
+					case 0x7FD0:
+					case 0x7FD8:
+						//Console.WriteLine("This mapper is doing undocumented register writes!");
+						break;
+					case 0x7FE8:
+					case 0x7FF0:
+						prg_bank = (byte)(value & 0x01);
+						chr_bank_high = (byte)((value >> 4) & 0x03);
+						chr_bank_low = (byte)((value >> 6) & 0x01);
+						//Console.WriteLine("chr_lw: {0}, chr_hg: {1}, value: {2}", chr_bank_low, chr_bank_high, value);
+						break;
+				}
+			}
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			int bank;
+			if (mode)
+			{
+				bank = (block_high << 1) | prg_bank;
+			}
+			else
+			{
+				bank = (block_high << 1) | block_low;
+			}
+			
+			byte value = ROM[((bank & prg_bank_mask_32k) * 0x8000) + (addr & 0x7FFF)];
+
+			if (addr >= 0x7F80)
+			{
+				WritePRG(addr, value);
+			}
+			
+			return value;
+			
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				int bank;
+				if (mode)
+				{
+					bank = (block_high << 3) | (chr_bank_low << 2) | chr_bank_high;
+				}
+				else
+				{
+					bank = (block_high << 3) | (block_low << 2) | chr_bank_high;
+				}
+
+				return VROM[((bank & chr_bank_mask_8k) * 0x2000) + (addr & 0x1FFF)];
+			}
+			return base.ReadPPU(addr);
+		}
+	}
+}