diff --git a/BizHawk.Emulation/Consoles/Nintendo/Gameboy/Gambatte.cs b/BizHawk.Emulation/Consoles/Nintendo/Gameboy/Gambatte.cs
index bd54048eab..18d7edf42c 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/Gameboy/Gambatte.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/Gameboy/Gambatte.cs
@@ -138,6 +138,8 @@ namespace BizHawk.Emulation.Consoles.GB
 			if (Controller["Power"])
 				LibGambatte.gambatte_reset(GambatteState);
 
+			RefreshMemoryCallbacks();
+
 			LibGambatte.gambatte_runfor(GambatteState, VideoBuffer, 160, soundbuff, ref nsamp);
 
 			// upload any modified data to the memory domains
@@ -221,6 +223,8 @@ namespace BizHawk.Emulation.Consoles.GB
 
 		public bool DeterministicEmulation { get { return true; } }
 
+		#region saveram
+
 		public byte[] ReadSaveRam()
 		{
 			int length = LibGambatte.gambatte_savesavedatalength(GambatteState);
@@ -271,6 +275,8 @@ namespace BizHawk.Emulation.Consoles.GB
 			set { }
 		}
 
+		#endregion
+
 		public void ResetFrameCounter()
 		{
 			// is this right?
@@ -368,6 +374,33 @@ namespace BizHawk.Emulation.Consoles.GB
 
 		#endregion
 
+		#region memorycallback
+
+		LibGambatte.MemoryCallback readcb;
+		LibGambatte.MemoryCallback writecb;
+
+		void RefreshMemoryCallbacks()
+		{
+			var mcs = CoreInputComm.MemoryCallbackSystem;
+
+			// we RefreshMemoryCallbacks() after the triggers in case the trigger turns itself off at that point
+
+			if (mcs.HasRead)
+				readcb = delegate(uint addr) { mcs.TriggerRead((int)addr); RefreshMemoryCallbacks(); };
+			else
+				readcb = null;
+			if (mcs.HasWrite)
+				writecb = delegate(uint addr) { mcs.TriggerWrite((int)addr); RefreshMemoryCallbacks(); };
+			else
+				writecb = null;
+
+			LibGambatte.gambatte_setreadcallback(GambatteState, readcb);
+			LibGambatte.gambatte_setwritecallback(GambatteState, writecb);
+		}
+	
+
+
+		#endregion
 
 		public CoreInputComm CoreInputComm { get; set; }
 
diff --git a/BizHawk.Emulation/Consoles/Nintendo/Gameboy/LibGambatte.cs b/BizHawk.Emulation/Consoles/Nintendo/Gameboy/LibGambatte.cs
index 4cade884cd..948998da5b 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/Gameboy/LibGambatte.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/Gameboy/LibGambatte.cs
@@ -78,7 +78,6 @@ namespace BizHawk.Emulation.Consoles.GB
 		[DllImport("libgambatte.dll", CallingConvention = CallingConvention.Cdecl)]
 		public static extern void gambatte_reset(IntPtr core);
 
-
 		/// <summary>
 		/// palette type for gambatte_setdmgpalettecolor
 		/// </summary>
@@ -130,6 +129,29 @@ namespace BizHawk.Emulation.Consoles.GB
 		[DllImport("libgambatte.dll", CallingConvention = CallingConvention.Cdecl)]
 		public static extern void gambatte_setinputgetter(IntPtr core, InputGetter getinput);
 
+		/// <summary>
+		/// type of the read\write memory callbacks
+		/// </summary>
+		/// <param name="address">the address which the cpu is read\writing</param>
+		[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+		public delegate void MemoryCallback(uint address);
+
+		/// <summary>
+		/// set a callback to occur immediately BEFORE EVERY cpu read
+		/// </summary>
+		/// <param name="core">opaque state pointer</param>
+		/// <param name="callback">null to clear</param>
+		[DllImport("libgambatte.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern void gambatte_setreadcallback(IntPtr core, MemoryCallback callback);
+
+		/// <summary>
+		/// set a callback to occur immediately AFTER EVERY cpu write
+		/// </summary>
+		/// <param name="core">opaque state pointer</param>
+		/// <param name="callback">null to clear</param>
+		[DllImport("libgambatte.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern void gambatte_setwritecallback(IntPtr core, MemoryCallback callback);
+
 		/// <summary>
 		/// Sets the directory used for storing save data. The default is the same directory as the ROM Image file.
 		/// </summary>
diff --git a/BizHawk.MultiClient/output/dll/libgambatte.dll b/BizHawk.MultiClient/output/dll/libgambatte.dll
index 259a8937a1..a7a81490b3 100644
Binary files a/BizHawk.MultiClient/output/dll/libgambatte.dll and b/BizHawk.MultiClient/output/dll/libgambatte.dll differ
diff --git a/libgambatte/include/gambatte.h b/libgambatte/include/gambatte.h
index caa0feb84d..ccc1dd2f8f 100644
--- a/libgambatte/include/gambatte.h
+++ b/libgambatte/include/gambatte.h
@@ -83,6 +83,9 @@ public:
 	/** Sets the callback used for getting input state. */
 	void setInputGetter(InputGetter *getInput);
 	
+	void setReadCallback(void (*callback)(unsigned));
+	void setWriteCallback(void (*callback)(unsigned));
+
 	/** Sets the directory used for storing save data. The default is the same directory as the ROM Image file. */
 	void setSaveDir(const std::string &sdir);
 	
diff --git a/libgambatte/src/cinterface.cpp b/libgambatte/src/cinterface.cpp
index 5c91912291..f85e0d589f 100644
--- a/libgambatte/src/cinterface.cpp
+++ b/libgambatte/src/cinterface.cpp
@@ -65,6 +65,18 @@ __declspec(dllexport) void gambatte_setinputgetter(void *core, unsigned (*getinp
 	g->setInputGetter(cig);
 }
 
+__declspec(dllexport) void gambatte_setreadcallback(void *core, void (*callback)(unsigned))
+{
+	GB *g = (GB *) core;
+	g->setReadCallback(callback);
+}
+
+__declspec(dllexport) void gambatte_setwritecallback(void *core, void (*callback)(unsigned))
+{
+	GB *g = (GB *) core;
+	g->setWriteCallback(callback);
+}
+
 __declspec(dllexport) void gambatte_setsavedir(void *core, const char *sdir)
 {
 	GB *g = (GB *) core;
diff --git a/libgambatte/src/cinterface.h b/libgambatte/src/cinterface.h
index 55748318ff..30278421ab 100644
--- a/libgambatte/src/cinterface.h
+++ b/libgambatte/src/cinterface.h
@@ -18,6 +18,10 @@ extern "C"
 
 	__declspec(dllexport) void gambatte_setinputgetter(void *core, unsigned (*getinput)(void));
 
+	__declspec(dllexport) void gambatte_setreadcallback(void *core, void (*callback)(unsigned));
+
+	__declspec(dllexport) void gambatte_setwritecallback(void *core, void (*callback)(unsigned));
+
 	__declspec(dllexport) void gambatte_setsavedir(void *core, const char *sdir);
 
 	__declspec(dllexport) int gambatte_iscgb(void *core);
diff --git a/libgambatte/src/cpu.h b/libgambatte/src/cpu.h
index 98cfd41da6..e56dafd9d1 100644
--- a/libgambatte/src/cpu.h
+++ b/libgambatte/src/cpu.h
@@ -64,6 +64,14 @@ public:
 	void setInputGetter(InputGetter *getInput) {
 		memory.setInputGetter(getInput);
 	}
+
+	void setReadCallback(void (*callback)(unsigned)) {
+		memory.setReadCallback(callback);
+	}
+
+	void setWriteCallback(void (*callback)(unsigned)) {
+		memory.setWriteCallback(callback);
+	}
 	
 	void setSaveDir(const std::string &sdir) {
 		memory.setSaveDir(sdir);
diff --git a/libgambatte/src/gambatte.cpp b/libgambatte/src/gambatte.cpp
index d445489ac0..52b64a32c6 100644
--- a/libgambatte/src/gambatte.cpp
+++ b/libgambatte/src/gambatte.cpp
@@ -95,6 +95,14 @@ void GB::setInputGetter(InputGetter *getInput) {
 	p_->cpu.setInputGetter(getInput);
 }
 
+void GB::setReadCallback(void (*callback)(unsigned)) {
+	p_->cpu.setReadCallback(callback);
+}
+
+void GB::setWriteCallback(void (*callback)(unsigned)) {
+	p_->cpu.setWriteCallback(callback);
+}
+
 void GB::setSaveDir(const std::string &sdir) {
 	p_->cpu.setSaveDir(sdir);
 }
diff --git a/libgambatte/src/memory.cpp b/libgambatte/src/memory.cpp
index 46358dd88e..72e99c495b 100644
--- a/libgambatte/src/memory.cpp
+++ b/libgambatte/src/memory.cpp
@@ -27,6 +27,8 @@ namespace gambatte {
 
 Memory::Memory(const Interrupter &interrupter_in)
 : getInput(0),
+  readCallback(0),
+  writeCallback(0),
   divLastUpdate(0),
   lastOamDmaUpdate(DISABLED_TIME),
   display(ioamhram, 0, VideoInterruptRequester(&intreq)),
diff --git a/libgambatte/src/memory.h b/libgambatte/src/memory.h
index 38617d894c..536a25f53f 100644
--- a/libgambatte/src/memory.h
+++ b/libgambatte/src/memory.h
@@ -33,6 +33,9 @@ class Memory {
 	Cartridge cart;
 	unsigned char ioamhram[0x200];
 	
+	void (*readCallback)(unsigned);
+	void (*writeCallback)(unsigned);
+
 	InputGetter *getInput;
 	unsigned long divLastUpdate;
 	unsigned long lastOamDmaUpdate;
@@ -111,6 +114,8 @@ public:
 	}
 
 	unsigned read(const unsigned P, const unsigned long cycleCounter) {
+		if (readCallback)
+			readCallback(P);
 		return cart.rmem(P >> 12) ? cart.rmem(P >> 12)[P] : nontrivial_read(P, cycleCounter);
 	}
 
@@ -119,6 +124,8 @@ public:
 			cart.wmem(P >> 12)[P] = data;
 		} else
 			nontrivial_write(P, data, cycleCounter);
+		if (writeCallback)
+			writeCallback(P);
 	}
 	
 	void ff_write(const unsigned P, const unsigned data, const unsigned long cycleCounter) {
@@ -138,6 +145,13 @@ public:
 		this->getInput = getInput;
 	}
 
+	void setReadCallback(void (*callback)(unsigned)) {
+		this->readCallback = callback;
+	}
+	void setWriteCallback(void (*callback)(unsigned)) {
+		this->writeCallback = callback;
+	}
+
 	void setEndtime(unsigned long cc, unsigned long inc);
 	
 	void setSoundBuffer(uint_least32_t *const buf) { sound.setBuffer(buf); }