diff --git a/BizHawk.Emulation/BizHawk.Emulation.csproj b/BizHawk.Emulation/BizHawk.Emulation.csproj
index cc04200b3e..9d387a75a1 100644
--- a/BizHawk.Emulation/BizHawk.Emulation.csproj
+++ b/BizHawk.Emulation/BizHawk.Emulation.csproj
@@ -76,6 +76,7 @@
     <Compile Include="Consoles\Nintendo\NES\Boards\IC_74x377.cs">
       <SubType>Code</SubType>
     </Compile>
+    <Compile Include="Consoles\Nintendo\NES\Boards\Irem_H3001.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Jaleco-JF_11_14.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper107.cs" />
     <Compile Include="Consoles\Nintendo\NES\Boards\Mapper242.cs" />
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/BoardSystem.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/BoardSystem.cs
index 59b0ebb516..bd9d57a69a 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/BoardSystem.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/BoardSystem.cs
@@ -5,6 +5,8 @@ using System.Globalization;
 using System.IO;
 using System.Collections.Generic;
 
+//TODO - consider bytebuffer for mirroring
+
 namespace BizHawk.Emulation.Consoles.Nintendo
 {
 	partial class NES
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Irem_H3001.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Irem_H3001.cs
new file mode 100644
index 0000000000..98a6958be7
--- /dev/null
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/Irem_H3001.cs
@@ -0,0 +1,145 @@
+using System;
+using System.IO;
+using System.Diagnostics;
+
+namespace BizHawk.Emulation.Consoles.Nintendo
+{
+	//AKA mapper 65
+
+	//Daiku no Gen San 2
+	//Spartan X 2
+
+	class Irem_H3001 : NES.NESBoardBase
+	{
+		//configuration
+		int prg_bank_mask, chr_bank_mask;
+
+		//state
+		ByteBuffer prg_regs_8k = new ByteBuffer(4);
+		ByteBuffer chr_regs_1k = new ByteBuffer(8);
+		bool irq_counter_enabled, irq_asserted;
+		ushort irq_counter, irq_reload;
+		int clock_counter;
+
+		public override bool Configure(NES.EDetectionOrigin origin)
+		{
+			//configure
+			switch (Cart.board_type)
+			{
+				case "IREM-H3001":
+					AssertPrg(128, 256); AssertChr(128, 256); AssertVram(0); AssertWram(0);
+					break;
+				default:
+					return false;
+			}
+
+			prg_bank_mask = Cart.prg_size / 8 - 1;
+			chr_bank_mask = Cart.chr_size - 1;
+
+			prg_regs_8k[0] = 0x00;
+			prg_regs_8k[1] = 0x01;
+			prg_regs_8k[2] = 0xFE;
+			prg_regs_8k[3] = 0xFF; //constant
+			return true;
+		}
+
+		public override void Dispose()
+		{
+			prg_regs_8k.Dispose();
+			chr_regs_1k.Dispose();
+		}
+
+		public override void ClockPPU()
+		{
+			clock_counter++;
+			if (clock_counter == 3)
+			{
+				ClockCPU();
+				clock_counter = 0;
+			}
+		}
+
+		void ClockCPU()
+		{
+			if(irq_counter==0) return;
+			if(!irq_counter_enabled) return;
+			irq_counter--;
+			if (irq_counter != 0) return;
+			irq_asserted = true;
+			SyncIRQ();
+		}
+
+		void SyncIRQ()
+		{
+			NES.irq_cart = irq_asserted;
+		}
+
+		public override byte ReadPRG(int addr)
+		{
+			int bank_8k = addr >> 13;
+			int ofs = addr & ((1 << 13) - 1);
+			bank_8k = prg_regs_8k[bank_8k];
+			bank_8k &= prg_bank_mask;
+			addr = (bank_8k << 13) | ofs;
+			return ROM[addr];
+		}
+
+		public override byte ReadPPU(int addr)
+		{
+			if (addr < 0x2000)
+			{
+				int bank_1k = addr >> 10;
+				int ofs = addr & ((1 << 10) - 1);
+				bank_1k = chr_regs_1k[bank_1k];
+				bank_1k &= chr_bank_mask;
+				addr = (bank_1k << 10) | ofs;
+				return VROM[addr];
+			}
+			else
+				return base.ReadPPU(addr);
+		}
+
+		public override void WritePRG(int addr, byte value)
+		{
+			switch (addr)
+			{
+				case 0x0000: //$8000:  PRG Reg 0 (8k @ $8000)
+					prg_regs_8k[0] = value;
+					break;
+				case 0x2000: //$A000:  PRG Reg 1 (8k @ $A000)
+					prg_regs_8k[1] = value;
+					break;
+				case 0x4000: //$C000:  PRG Reg 2 (8k @ $C000)
+					prg_regs_8k[2] = value;
+					break;
+
+				case 0x1001: //$9001:  [M... ....]  Mirroring
+					if ((value & 0x80) == 0) SetMirrorType(EMirrorType.Vertical);
+					else SetMirrorType(EMirrorType.Horizontal);
+					break;
+				case 0x1003: //$9003:  [E... ....]  IRQ Enable (0=disabled, 1=enabled)
+					irq_counter_enabled = (value & 0x80) != 0;
+					irq_asserted = false;
+					SyncIRQ();
+					break;
+				case 0x1004: //$9004:  [.... ....]  Reload IRQ counter
+					irq_counter = irq_reload;
+					irq_asserted = false;
+					SyncIRQ();
+					break;
+				case 0x1005: //$9005:  [IIII IIII]  High 8 bits of IRQ Reload value
+					irq_reload = (ushort)((irq_reload & 0x00FF) | (value << 8));
+					break;
+				case 0x1006: //$9006:  [IIII IIII]  Low 8 bits of IRQ Reload value
+					irq_reload = (ushort)((irq_reload & 0xFF00) | (value));
+					break;
+
+				//$B000-$B007:  CHR regs
+				case 0x3000: case 0x3001: case 0x3002: case 0x3003:
+				case 0x3004: case 0x3005: case 0x3006: case 0x3007:
+					chr_regs_1k[addr - 0x3000] = value;
+					break;
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3_family.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3_family.cs
index a452433958..4e0f0f2b42 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3_family.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Boards/MMC3_family/MMC3_family.cs
@@ -10,6 +10,8 @@
 //mappers handled by this:
 //004,095,118,119,206
 
+//TODO - redo this with the 0xFF bank idea from Sunsoft-4
+
 using System;
 using System.IO;
 using System.Diagnostics;