diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index 983afdc06b..fc15ae156a 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -617,6 +617,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper136.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper143.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper147.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper150.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper156.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper164.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper168.cs" />
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper150.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper150.cs
new file mode 100644
index 0000000000..31b6d8f4e3
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper150.cs
@@ -0,0 +1,134 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	// basic on FCEUX src
+	public sealed class Mapper150 : NES.NESBoardBase
+	{
+		private ByteBuffer latch = new ByteBuffer(8);
+		private int cmd;
+		private int chr_mask;
+		private int prg_mask;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "MAPPER150":
+					break;
+				default:
+					return false;
+			}
+
+			chr_mask = (Cart.chr_size / 8) - 1;
+			prg_mask = (Cart.prg_size / 32) - 1;
+
+			latch[1] = 3;
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("latch", ref latch);
+			ser.Sync("cmd", ref cmd);
+		}
+
+		public override void WriteEXP(int addr, byte value)
+		{
+			addr += 0x4000;
+			Write(addr, value);
+			SetMirroring(latch[2]);
+		}
+
+		public override void WriteWRAM(int addr, byte value)
+		{
+			addr += 0x6000;
+			Write(addr, value);
+			SetMirroring(latch[2]);
+		}
+
+		private void Write(int addr, byte value)
+		{
+			addr &= 0x4101;
+			if (addr == 0x4100)
+			{
+				cmd = value & 7;
+			}
+			else
+			{
+				switch (cmd)
+				{
+					case 2:
+						latch[0] = (byte)(value & 1);
+						latch[3] = (byte)((value & 1) << 3);
+						break;
+					case 4:
+						latch[4] = (byte)((value & 1) << 2);
+						break;
+					case 5:
+						latch[0] = (byte)(value & 7);
+						break;
+					case 6:
+						latch[1] = (byte)(value & 3);
+						break;
+					case 7:
+						latch[2] = (byte)(value >> 1);
+						break;
+				}
+			}
+		}
+
+		private void SetMirroring(byte val)
+		{
+			switch (val & 3)
+			{
+				case 0:
+					SetMirrorType(EMirrorType.Horizontal);
+					break;
+				case 1:
+					SetMirrorType(EMirrorType.Vertical);
+					break;
+				case 2:
+					SetMirroring(0, 1, 1, 1);
+					break;
+				case 3:
+					SetMirrorType(EMirrorType.OneScreenB);
+					break;
+			}
+		}
+
+		public override byte ReadEXP(int addr)
+		{
+			byte ret;
+			addr += 0x4000;
+			if ((addr & 0x4100) == 0x4100)
+			{
+				ret = (byte)((~cmd) & 0x3F);
+			}
+			else
+			{
+				ret = NES.DB;
+			}
+
+			return ret;
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			return ROM[((latch[0] & prg_mask) << 15) + addr];
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				int bank = latch[1] | latch[3] | latch[4];
+				bank &= chr_mask;
+				return VROM[(bank << 13) + addr];
+			}
+
+			return base.ReadPPU(addr);
+		}
+	}
+}