diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index 5bbdcae4d5..569363dae2 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -751,6 +751,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\TENGEN-800032.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\TENGEN_800008.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF-DREAMTECH01.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-12-IN-1.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-190in1.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-64in1-NR.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-8157.cs" />
@@ -780,7 +781,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\VRC3.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\VRC6.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\VRC7.cs" />
-		<Compile Include="Consoles\Nintendo\NES\Boards\VS_M99.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\VS_M99.cs" />
     <Compile Include="Consoles\Nintendo\NES\BisqAPU.cs" />
     <Compile Include="Consoles\Nintendo\NES\FDS\FDS.cs" />
     <Compile Include="Consoles\Nintendo\NES\FDS\FDSAudio.cs" />
@@ -1191,4 +1192,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>
\ No newline at end of file
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-12-IN-1.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-12-IN-1.cs
new file mode 100644
index 0000000000..80e90a5d59
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-12-IN-1.cs
@@ -0,0 +1,122 @@
+using BizHawk.Common;
+using BizHawk.Common.NumberExtensions;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	public sealed class UNIF_BMC_12_IN_1 : NES.NESBoardBase
+	{
+		private ByteBuffer regs = new ByteBuffer(2);
+		private byte ctrl;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "UNIF_BMC-12-IN-1":
+					break;
+				default:
+					return false;
+			}
+
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			ser.Sync("regs", ref regs);
+			ser.Sync("ctrl", ref ctrl);
+			base.SyncState(ser);
+		}
+
+		public override void Dispose()
+		{
+			regs.Dispose();
+			base.Dispose();
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			addr += 0x8000;
+			switch (addr & 0xE000)
+			{
+				case 0xA000:
+					regs[0] = value;
+					SetMirroring(ctrl.Bit(2));
+					break;
+				case 0xC000:
+					regs[1] = value;
+					SetMirroring(ctrl.Bit(2));
+					break;
+				case 0xE000:
+					ctrl = (byte)(value & 0x0F);
+					SetMirroring(ctrl.Bit(2));
+					break;
+			}
+		}
+
+		private void SetMirroring(bool horizontal)
+		{
+			if (horizontal)
+			{
+				SetMirrorType(EMirrorType.Horizontal);
+			}
+			else
+			{
+				SetMirrorType(EMirrorType.Vertical);
+			}
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				int basebank = (ctrl & 3) << 3;
+				int bank = 0;
+				if (addr < 0x1000)
+				{
+					bank = regs[0] >> 3 | (basebank << 2);
+				}
+				else
+				{
+					bank = regs[1] >> 3 | (basebank << 2);
+				}
+
+				return VROM[(bank << 12) + (addr & 0xFFF)];
+			}
+
+			return base.ReadPPU(addr);
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			var basebank = (ctrl & 3) << 3;
+			int bank = 0;
+
+			if (ctrl.Bit(3))
+			{
+				if (addr < 0x4000)
+				{
+					bank = basebank | (regs[0] & 6) | 0;
+					
+				}
+				else
+				{
+					bank = basebank | (regs[0] & 6) | 1;
+				}
+			}
+			else
+			{
+				if (addr < 0x4000)
+				{
+					bank = basebank | (regs[0] & 7);
+				}
+				else
+				{
+					bank = basebank | 7;
+				}
+			}
+
+			return ROM[(bank << 14) + (addr & 0x3FFF)];
+		}
+	}
+}