diff --git a/Core/Core.vcxproj b/Core/Core.vcxproj
index 0aec08bd..313758b9 100644
--- a/Core/Core.vcxproj
+++ b/Core/Core.vcxproj
@@ -489,6 +489,7 @@
     <ClInclude Include="BaseVideoFilter.h" />
     <ClInclude Include="VirtualController.h" />
     <ClInclude Include="VRC2_4.h" />
+    <ClInclude Include="VRC3.h" />
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="APU.cpp" />
diff --git a/Core/Core.vcxproj.filters b/Core/Core.vcxproj.filters
index bc208c8f..ebdd126f 100644
--- a/Core/Core.vcxproj.filters
+++ b/Core/Core.vcxproj.filters
@@ -437,6 +437,9 @@
     <ClInclude Include="SunSoft3.h">
       <Filter>Nes\Mappers</Filter>
     </ClInclude>
+    <ClInclude Include="VRC3.h">
+      <Filter>Nes\Mappers</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">
diff --git a/Core/MapperFactory.cpp b/Core/MapperFactory.cpp
index 5fb3661e..cef632e8 100644
--- a/Core/MapperFactory.cpp
+++ b/Core/MapperFactory.cpp
@@ -72,6 +72,7 @@
 #include "UnRom_180.h"
 #include "VRC1.h"
 #include "VRC2_4.h"
+#include "VRC3.h"
 
 BaseMapper* MapperFactory::GetMapperFromID(ROMLoader &romLoader)
 {
@@ -118,6 +119,7 @@ BaseMapper* MapperFactory::GetMapperFromID(ROMLoader &romLoader)
 		case 70: return new Bandai74161_7432(false);
 		case 71: return new BF909x();
 		case 72: return new JalecoJf17_19(false);
+		case 73: return new VRC3();
 		case 74: return new MMC3_ChrRam(0x08, 0x09, 2);
 		case 75: return new VRC1();
 		case 76: return new Namco108_76();
diff --git a/Core/VRC3.h b/Core/VRC3.h
new file mode 100644
index 00000000..977d7f97
--- /dev/null
+++ b/Core/VRC3.h
@@ -0,0 +1,80 @@
+#pragma once
+#include "stdafx.h"
+#include "BaseMapper.h"
+#include "CPU.h"
+
+class VRC3 : public BaseMapper
+{
+private:
+	bool _irqEnableOnAck = false;
+	bool _irqEnabled = false;
+	bool _smallCounter = false;
+	uint16_t _irqReload = 0;
+	uint16_t _irqCounter = 0;
+
+protected:
+	virtual uint16_t GetPRGPageSize() { return 0x4000; }
+	virtual uint16_t GetCHRPageSize() { return 0x2000; }
+
+	void InitMapper()
+	{
+		SelectPRGPage(1, -1);
+		SelectCHRPage(0, 0);
+	}
+
+	virtual void StreamState(bool saving)
+	{
+		BaseMapper::StreamState(saving);
+		Stream<bool>(_irqEnableOnAck);
+		Stream<bool>(_smallCounter);
+		Stream<bool>(_irqEnabled);
+		Stream<uint16_t>(_irqCounter);
+		Stream<uint16_t>(_irqReload);
+	}
+
+	virtual void ProcessCpuClock()
+	{
+		if(_irqEnabled) {
+			if(_smallCounter) {
+				uint8_t smallCounter = _irqCounter & 0xFF;
+				smallCounter++;
+				if(_smallCounter == 0) {
+					smallCounter = _irqReload & 0xFF;
+					CPU::SetIRQSource(IRQSource::External);
+				}
+				_irqCounter = (_irqCounter & 0xFF00) | smallCounter;
+			} else {
+				_irqCounter++;
+				if(_irqCounter == 0) {
+					_irqCounter = _irqReload;
+					CPU::SetIRQSource(IRQSource::External);
+				}
+			}
+		}
+	}
+
+	void WriteRegister(uint16_t addr, uint8_t value)
+	{
+		switch(addr & 0xF000) {
+			case 0x8000: _irqReload = (_irqReload & 0xFFF0) | (value & 0x0F); break;
+			case 0x9000: _irqReload = (_irqReload & 0xFF0F) | ((value & 0x0F) << 4); break;
+			case 0xA000: _irqReload = (_irqReload & 0xF0FF) | ((value & 0x0F) << 8); break;
+			case 0xB000: _irqReload = (_irqReload & 0x0FFF) | ((value & 0x0F) << 12); break;
+			case 0xC000:
+				_irqEnabled = (value & 0x02) == 0x02;
+				if(_irqEnabled) {
+					_irqCounter = _irqReload;
+				}
+				_smallCounter = (value & 0x04) == 0x04;
+				_irqEnableOnAck = (value & 0x01) == 0x01;
+				CPU::ClearIRQSource(IRQSource::External);
+				break;
+			case 0xD000:
+				CPU::ClearIRQSource(IRQSource::External);
+				_irqEnabled = _irqEnableOnAck;				
+				break;
+			case 0xF000: SelectPRGPage(0, value & 0x07); break;
+		}
+	}
+};
+#pragma once