diff --git a/BizHawk.Emulation/Consoles/Nintendo/GBA/LibMeteor.cs b/BizHawk.Emulation/Consoles/Nintendo/GBA/LibMeteor.cs
index 957396ae12..2080b0f72d 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/GBA/LibMeteor.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/GBA/LibMeteor.cs
@@ -132,5 +132,19 @@ namespace BizHawk.Emulation.Consoles.Nintendo.GBA
 		/// <returns>IntPtr.Zero if which is unrecognized</returns>
 		[DllImport("libmeteor.dll", CallingConvention = CallingConvention.Cdecl)]
 		public static extern IntPtr libmeteor_getmemoryarea(MemoryArea which);
+
+		/// <summary>
+		/// core callback for tracelogging
+		/// </summary>
+		/// <param name="msg">disassembly of an instruction about to be run</param>
+		[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+		public delegate void TraceCallback(string msg);
+
+		/// <summary>
+		/// set callback to run before each instruction is executed
+		/// </summary>
+		/// <param name="callback">null to clear</param>
+		[DllImport("libmeteor.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern void libmeteor_settracecallback(TraceCallback callback);
 	}
 }
diff --git a/BizHawk.Emulation/Consoles/Nintendo/GBA/Meteor.cs b/BizHawk.Emulation/Consoles/Nintendo/GBA/Meteor.cs
index c042116a5d..d2c21a8630 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/GBA/Meteor.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/GBA/Meteor.cs
@@ -40,6 +40,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo.GBA
 
 			if (Controller["Power"])
 				LibMeteor.libmeteor_hardreset();
+			// due to the design of the tracing api, we have to poll whether it's active each frame
+			LibMeteor.libmeteor_settracecallback(CoreInputComm.Tracer.Enabled ? tracecallback : null);
 			if (!coredead)
 				LibMeteor.libmeteor_frameadvance();
 			if (IsLagFrame)
@@ -111,7 +113,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo.GBA
 		CoreOutputComm _CoreOutputComm = new CoreOutputComm
 		{
 			VsyncNum = 262144,
-			VsyncDen = 4389
+			VsyncDen = 4389,
+			CpuTraceAvailable = true
 		};
 
 		public CoreOutputComm CoreOutputComm { get { return _CoreOutputComm; } }
@@ -181,6 +184,8 @@ namespace BizHawk.Emulation.Consoles.Nintendo.GBA
 		LibMeteor.InputCallback inputcallback;
 		/// <summary>true if libmeteor aborted</summary>
 		bool coredead = false;
+		/// <summary>hold pointer to trace callback so it won't get GCed</summary>
+		LibMeteor.TraceCallback tracecallback;
 
 		LibMeteor.Buttons GetInput()
 		{
@@ -279,6 +284,11 @@ namespace BizHawk.Emulation.Consoles.Nintendo.GBA
 
 		#endregion
 
+		void Trace(string msg)
+		{
+			CoreInputComm.Tracer.Put(msg);
+		}
+
 		void Init()
 		{
 			if (attachedcore != null)
@@ -286,6 +296,7 @@ namespace BizHawk.Emulation.Consoles.Nintendo.GBA
 
 			messagecallback = PrintMessage;
 			inputcallback = GetInput;
+			tracecallback = Trace; // don't set this callback now, only set if enabled
 			LibMeteor.libmeteor_setmessagecallback(messagecallback);
 			LibMeteor.libmeteor_setkeycallback(inputcallback);
 
@@ -315,8 +326,10 @@ namespace BizHawk.Emulation.Consoles.Nintendo.GBA
 				LibMeteor.libmeteor_setbuffers(IntPtr.Zero, 240 * 160 * 4, IntPtr.Zero, 4);
 				messagecallback = null;
 				inputcallback = null;
+				tracecallback = null;
 				LibMeteor.libmeteor_setmessagecallback(messagecallback);
 				LibMeteor.libmeteor_setkeycallback(inputcallback);
+				LibMeteor.libmeteor_settracecallback(tracecallback);
 				_MemoryDomains.Clear();
 			}
 		}
diff --git a/BizHawk.MultiClient/output/dll/libmeteor.dll b/BizHawk.MultiClient/output/dll/libmeteor.dll
index 26024bf318..50f57c2b7f 100644
Binary files a/BizHawk.MultiClient/output/dll/libmeteor.dll and b/BizHawk.MultiClient/output/dll/libmeteor.dll differ
diff --git a/libmeteor/cinterface.cpp b/libmeteor/cinterface.cpp
index 1df9438806..36ec943370 100644
--- a/libmeteor/cinterface.cpp
+++ b/libmeteor/cinterface.cpp
@@ -42,6 +42,21 @@ EXPORT void libmeteor_setkeycallback(uint16_t (*callback)())
 	keycallback = callback;
 }
 
+bool traceenabled = false;
+void (*tracecallback)(const char *msg) = NULL;
+
+EXPORT void libmeteor_settracecallback(void (*callback)(const char*msg))
+{
+	tracecallback = callback;
+	traceenabled = tracecallback != NULL;
+}
+
+void trace_bizhawk(std::string msg)
+{
+	if (tracecallback)
+		tracecallback(msg.c_str());
+}
+
 EXPORT void libmeteor_hardreset()
 {
 	AMeteor::Reset(AMeteor::UNIT_ALL ^ (AMeteor::UNIT_MEMORY_BIOS | AMeteor::UNIT_MEMORY_ROM));
@@ -105,17 +120,16 @@ EXPORT void libmeteor_init()
 	static bool first = true;
 	if (first)
 	{
+		// TODO: saveram stuff
 		//AMeteor::_memory.LoadCartInferred();
 		AMeteor::_lcd.GetScreen().GetRenderer().SetFrameSlot(syg::ptr_fun(videocb));
 		AMeteor::_sound.GetSpeaker().SetFrameSlot(syg::ptr_fun(soundcb));
-		// TODO: input
 		first = false;
 	}
 }
 
 EXPORT void libmeteor_frameadvance()
 {
-	//AMeteor::_keypad.SetPadState(0x3ff);
 	AMeteor::Run(10000000);
 }
 
diff --git a/libmeteor/libmeteor.vcxproj b/libmeteor/libmeteor.vcxproj
index af4244960e..63035cb960 100644
--- a/libmeteor/libmeteor.vcxproj
+++ b/libmeteor/libmeteor.vcxproj
@@ -51,7 +51,7 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;LIBMETEOR_EXPORTS;%(PreprocessorDefinitions);METDEBUG;METDEBUGLOG</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;LIBMETEOR_EXPORTS;%(PreprocessorDefinitions);METDEBUG;METDEBUGLOG;_ITERATOR_DEBUG_LEVEL=0</PreprocessorDefinitions>
       <DisableSpecificWarnings>4800;4396</DisableSpecificWarnings>
     </ClCompile>
     <Link>
diff --git a/libmeteor/source/debug.hpp b/libmeteor/source/debug.hpp
index 7c2c5236ae..fd8f7c5c2f 100644
--- a/libmeteor/source/debug.hpp
+++ b/libmeteor/source/debug.hpp
@@ -30,6 +30,8 @@ void print_bizhawk(const char *msg);
 void print_bizhawk(std::string &msg);
 void abort_bizhawk(const char *msg);
 void keyupdate_bizhawk();
+extern bool traceenabled;
+void trace_bizhawk(std::string msg);
 
 #if 0
 #define met_abort(str) \
diff --git a/libmeteor/source/interpreter.cpp b/libmeteor/source/interpreter.cpp
index bd33e34267..242b884d82 100644
--- a/libmeteor/source/interpreter.cpp
+++ b/libmeteor/source/interpreter.cpp
@@ -24,6 +24,7 @@
 #include "ameteor.hpp"
 
 #include "debug.hpp"
+#include <sstream>
 
 namespace AMeteor
 {
@@ -70,7 +71,12 @@ namespace AMeteor
 							met_abort("PC not 16 bit aligned : " << IOS_ADD << R(15));
 
 						code = MEM.Read16(R(15)-2);
-						//std::cerr << IOS_ADD << R(15) << ' ' << Disassembler::Instruction(R(15), (uint16_t)code).ToString() << std::endl;
+						if (traceenabled)
+						{
+							std::stringstream ss;
+							ss << IOS_ADD << R(15) << ' ' << Disassembler::Instruction(R(15), (uint16_t)code).ToString();
+							trace_bizhawk(ss.str());
+						}
 						R(15) += 2;
 						t_Code();
 					}
@@ -108,7 +114,12 @@ namespace AMeteor
 						else
 						{
 							code = MEM.Read32(R(15)-4);
-							//std::cerr << IOS_ADD << R(15) << ' ' << Disassembler::Instruction(R(15), (uint32_t)code).ToString() << std::endl;
+							if (traceenabled)
+							{
+								std::stringstream ss;
+								ss << IOS_ADD << R(15) << ' ' << Disassembler::Instruction(R(15), (uint32_t)code).ToString();
+								trace_bizhawk(ss.str());
+							}
 							R(15) += 4;
 							a_Code();
 						}