diff --git a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
index f75fa5bcd9..3049b377d5 100644
--- a/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
+++ b/BizHawk.Emulation.Cores/BizHawk.Emulation.Cores.csproj
@@ -641,6 +641,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF-DREAMTECH01.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-190in1.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-A65AS.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-BS-5.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-GS-2004.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-GS-2013.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\UNIF\UNIF_BMC-T-262.cs" />
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-BS-5.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-BS-5.cs
new file mode 100644
index 0000000000..88c8db1ecc
--- /dev/null
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/UNIF/UNIF_BMC-BS-5.cs
@@ -0,0 +1,123 @@
+using BizHawk.Common;
+
+namespace BizHawk.Emulation.Cores.Nintendo.NES
+{
+	public class UNIF_BMC_BS_5 : NES.NESBoardBase
+	{
+		[MapperProp]
+		public int BMC_BS_5_DipSwitch;
+
+		private IntBuffer reg_prg = new IntBuffer(4);
+		private IntBuffer reg_chr = new IntBuffer(4);
+
+		private int _prgMask8k;
+		private int _chrMask2k;
+
+		private const int DipSwitchMask = 3;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "UNIF_BMC-BS-5":
+					break;
+				default:
+					return false;
+			}
+
+			reg_prg[0] = 0xFF;
+			reg_prg[1] = 0xFF;
+			reg_prg[2] = 0xFF;
+			reg_prg[3] = 0xFF;
+
+			SetMirrorType(EMirrorType.Vertical);
+
+			_prgMask8k = Cart.prg_size / 8 - 1;
+			_chrMask2k = Cart.prg_size / 2 - 1;
+
+			AutoMapperProps.Apply(this);
+
+			return true;
+		}
+
+		public override void NESSoftReset()
+		{
+			reg_prg[0] = 0xFF;
+			reg_prg[1] = 0xFF;
+			reg_prg[2] = 0xFF;
+			reg_prg[3] = 0xFF;
+
+			base.NESSoftReset();
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("reg_prg", ref reg_prg);
+			ser.Sync("reg_chr", ref reg_chr);
+			ser.Sync("BMC_BS_5_DipSwitch", ref BMC_BS_5_DipSwitch);
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			// TODO: clean this up
+			addr += 0x8000;
+			int bank_sel = (addr & 0xC00) >> 10;
+			switch (addr & 0xF000)
+			{
+				case 0x8000:
+					reg_chr[bank_sel] = addr & 0x1F;
+					break;
+				case 0xA000:
+					if ((addr & (1 << (BMC_BS_5_DipSwitch + 4))) > 0)
+					{
+						reg_prg[bank_sel] = addr & 0x0F;
+					}
+					break;
+			}
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				return ROM[((reg_prg[0] & _prgMask8k) * 0x2000) + (addr & 0x1FFF)];
+			}
+			else if (addr < 0x4000)
+			{
+				return ROM[((reg_prg[1] & _prgMask8k) * 0x2000) + (addr & 0x1FFF)];
+			}
+			else if (addr < 0x6000)
+			{
+				return ROM[((reg_prg[2] & _prgMask8k) * 0x2000) + (addr & 0x1FFF)];
+			}
+
+			return ROM[((reg_prg[3] & _prgMask8k) * 0x2000) + (addr & 0x1FFF)];
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				if (addr < 0x800)
+				{
+					return VROM[((reg_chr[0] & _chrMask2k) * 0x800) + (addr & 0x7FF)];
+				}
+
+				if (addr < 0x1000)
+				{
+					return VROM[((reg_chr[1] & _chrMask2k) * 0x800) + (addr & 0x7FF)];
+				}
+
+				if (addr < 0x1800)
+				{
+					return VROM[((reg_chr[2] & _chrMask2k) * 0x800) + (addr & 0x7FF)];
+				}
+
+				return VROM[((reg_chr[3] & _chrMask2k) * 0x800) + (addr & 0x7FF)];
+			}
+
+			return base.ReadPPU(addr);
+		}
+	}
+}