diff --git a/BizHawk.Emulation/BizHawk.Emulation.csproj b/BizHawk.Emulation/BizHawk.Emulation.csproj
index 1f22f92375..b65486d04c 100644
--- a/BizHawk.Emulation/BizHawk.Emulation.csproj
+++ b/BizHawk.Emulation/BizHawk.Emulation.csproj
@@ -110,6 +110,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper089.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper093.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper107.cs" />
+    <Compile Include="Consoles\Nintendo\NES\Boards\Mapper164.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper180.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper240.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper242.cs" />
diff --git a/BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt b/BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt
index e6abb644fb..f4472eddb8 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt
+++ b/BizHawk.Emulation/Consoles/Nintendo/Docs/compatibility.txt
@@ -93,7 +93,7 @@ Open bus and bus conflict emulation is not considered complete or thorough in an
 152	Misc (J)	Complete
 154	Misc (J)	Nothing
 159	Bandai		{{See 016}}
-164	Pirate		Junk
+164	Pirate		Started
 165	Pirate		Junk
 180	Misc (J)	Complete (but we don't implement the crazy climber controller) 
 182	MMC3Variant	Nothing
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper164.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper164.cs
new file mode 100644
index 0000000000..fbd4bb5ac1
--- /dev/null
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Mapper164.cs
@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	class Mapper164 : NES.NESBoardBase 
+	{
+		//Mapper 164
+		//Final Fantasy V (Unl)
+
+		int prg;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			switch (Cart.board_type)
+			{
+				case "Mapper164":
+					break;
+				default:
+					return false;
+			}
+			SetMirrorType(Cart.pad_h, Cart.pad_v);
+			prg = 0xFF;
+			return true;
+		}
+
+		public override void WriteEXP(int addr, byte value)
+		{
+			addr &= 0xF300;
+			if (addr == 0x5000)
+				prg = value;
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			addr &= 0xF300;
+			if (addr == 0xD000)
+				prg = value;
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			return VROM[addr + (prg * 0x8000)];
+		}
+	}
+}
diff --git a/BizHawk.MultiClient/output/gamedb.txt b/BizHawk.MultiClient/output/gamedb.txt
index 631fa0b387..fa978c44c2 100644
--- a/BizHawk.MultiClient/output/gamedb.txt
+++ b/BizHawk.MultiClient/output/gamedb.txt
@@ -90,6 +90,7 @@ sha1:7BD102770FE7766BF8430ACDB3C17EE51E30478C	H	Mike Tyson's Punch-Out!! (Hacked
 sha1:536D623BA02A622BDE8E2D7D514AE9785B5E0357	H	Punch Out!! Kirby (Hack) (U)	NES		board=NES-PNROM;PRG=128;CHR=128;WRAM=0
 
 ;other assorted roms
+sha1:D09EF8127C64CBE817B45DF33C4D43E7B441E381		Final Fantasy V (Unl)	NES		board=Mapper164;PRG=512;CHR=0;WRAM=8;PRAM=8
 sha1:92D9695FEB774F60965A8303CFE3E6AAEE7B7B62		Magic Dragon (Unl)	NES		board=Mapper107;PRG=128;CHR=64;WRAM=8;PAD_H=1
 
 #include gamedb_neshomebrew.txt