diff --git a/BizHawk.Emulation/BizHawk.Emulation.csproj b/BizHawk.Emulation/BizHawk.Emulation.csproj
index 7e9a9e6c82..baab746650 100644
--- a/BizHawk.Emulation/BizHawk.Emulation.csproj
+++ b/BizHawk.Emulation/BizHawk.Emulation.csproj
@@ -100,6 +100,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\IC_74x377.cs">
       <SubType>Code</SubType>
     </Compile>
+    <Compile Include="Consoles\Nintendo\NES\Boards\IREM-74_161_161_21_138.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Irem_G101.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Irem_H3001.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\IREM_TAM_S1.cs" />
diff --git a/BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt b/BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt
index 3401cca7ed..c976e92809 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt
+++ b/BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt
@@ -64,7 +64,7 @@ Open bus and bus conflict emulation is not considered complete or thorough in an
 074	Pirate (CN)	Junk
 075	VRC1		Nothing
 076	Misc (J)	Nothing
-077	Misc (J)	Nothing
+077	Misc (J)	Complete
 078	Misc		Complete
 079	NINA-06		Complete
 080	Misc (J)	Nothing
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/IREM-74_161_161_21_138.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/IREM-74_161_161_21_138.cs
new file mode 100644
index 0000000000..446afc3a4b
--- /dev/null
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/IREM-74_161_161_21_138.cs
@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	//Mapper 77
+	//Napoleon Senki
+
+	class IREM_74_161_161_21_138 : NES.NESBoardBase
+	{
+		int chr, prg;
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			//configure
+			switch (Cart.board_type)
+			{
+				case "IREM-74*161/161/21/138":
+					break;
+				default:
+					return false;
+			}
+
+			SetMirrorType(Cart.pad_h, Cart.pad_v);
+			return true;
+		}
+
+		public override void SyncState(Serializer ser)
+		{
+			base.SyncState(ser);
+			ser.Sync("chr", ref chr);
+			ser.Sync("prg", ref prg);
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			chr = (value >> 4) & 0x0F;
+			prg = value & 0x0F;
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x0800)
+			{
+				return VROM[addr + (chr * 0x0800)];
+			}
+			else if (addr < 0x2000)
+				return VRAM[addr];
+			else return base.ReadPPU(addr);
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			if (addr < 0x8000)
+				return ROM[addr + (prg * 0x8000)];
+			else
+				return base.ReadPRG(addr); 
+		}
+	}
+}
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper107.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper107.cs
index 6cc2cfa29a..71308f0984 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper107.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper107.cs
@@ -40,7 +40,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 		}
 
 		public override byte ReadPPU(int addr)
-        {
+		{
 			if (addr < 0x2000)
 			{
 				int ofs = addr & ((1 << 13) - 1);
@@ -48,7 +48,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 				return VROM[addr];
 			}
 			else return base.ReadPPU(addr);
-        }
+		}
 
 		public override byte ReadPRG(int addr)
 		{