diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/QuickNES/QuickNES.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/QuickNES/QuickNES.cs
index 248d56f9d2..7c84b3dda1 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/QuickNES/QuickNES.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/QuickNES/QuickNES.cs
@@ -30,44 +30,51 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.QuickNES
 		[CoreConstructor("NES")]
 		public QuickNES(CoreComm comm, byte[] file, object settings, object syncSettings)
 		{
-			ServiceProvider = new BasicServiceProvider(this);
-			CoreComm = comm;
+			FP = OSTailoredCode.CurrentOS == OSTailoredCode.DistinctOS.Windows
+				? (IFPCtrl) new Win32_FPCtrl()
+				: new Unix_FPCtrl();
 
-			Context = QN.qn_new();
-			if (Context == IntPtr.Zero)
+			using (FP.Save())
 			{
-				throw new InvalidOperationException($"{nameof(QN.qn_new)}() returned NULL");
-			}
+				ServiceProvider = new BasicServiceProvider(this);
+				CoreComm = comm;
 
-			try
-			{
+				Context = QN.qn_new();
+				if (Context == IntPtr.Zero)
+				{
+					throw new InvalidOperationException($"{nameof(QN.qn_new)}() returned NULL");
+				}
 
-				file = FixInesHeader(file);
-				LibQuickNES.ThrowStringError(QN.qn_loadines(Context, file, file.Length));
+				try
+				{
 
-				InitSaveRamBuff();
-				InitSaveStateBuff();
-				InitAudio();
-				InitMemoryDomains();
+					file = FixInesHeader(file);
+					LibQuickNES.ThrowStringError(QN.qn_loadines(Context, file, file.Length));
 
-				int mapper = 0;
-				string mappername = Marshal.PtrToStringAnsi(QN.qn_get_mapper(Context, ref mapper));
-				Console.WriteLine("QuickNES: Booted with Mapper #{0} \"{1}\"", mapper, mappername);
-				BoardName = mappername;
-				PutSettings((QuickNESSettings)settings ?? new QuickNESSettings());
+					InitSaveRamBuff();
+					InitSaveStateBuff();
+					InitAudio();
+					InitMemoryDomains();
 
-				_syncSettings = (QuickNESSyncSettings)syncSettings ?? new QuickNESSyncSettings();
-				_syncSettingsNext = _syncSettings.Clone();
+					int mapper = 0;
+					string mappername = Marshal.PtrToStringAnsi(QN.qn_get_mapper(Context, ref mapper));
+					Console.WriteLine("QuickNES: Booted with Mapper #{0} \"{1}\"", mapper, mappername);
+					BoardName = mappername;
+					PutSettings((QuickNESSettings)settings ?? new QuickNESSettings());
 
-				SetControllerDefinition();
-				ComputeBootGod();
+					_syncSettings = (QuickNESSyncSettings)syncSettings ?? new QuickNESSyncSettings();
+					_syncSettingsNext = _syncSettings.Clone();
 
-				ConnectTracer();
-			}
-			catch
-			{
-				Dispose();
-				throw;
+					SetControllerDefinition();
+					ComputeBootGod();
+
+					ConnectTracer();
+				}
+				catch
+				{
+					Dispose();
+					throw;
+				}
 			}
 		}
 
@@ -76,6 +83,53 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.QuickNES
 
 		public IEmulatorServiceProvider ServiceProvider { get; private set; }
 
+		#region FPU precision
+
+		private interface IFPCtrl : IDisposable
+		{
+			IDisposable Save();
+		}
+
+
+		private class Win32_FPCtrl : IFPCtrl
+		{
+			[DllImport("msvcrt.dll", CallingConvention = CallingConvention.Cdecl)]
+			public static extern uint _control87(uint @new, uint mask);
+
+			public static void PrintCurrentFP()
+			{
+				uint curr = _control87(0, 0);
+				Console.WriteLine("Current FP word: 0x{0:x8}", curr);
+			}
+
+			uint cw;
+
+			public IDisposable Save()
+			{
+				cw = _control87(0, 0);
+				_control87(0x00000, 0x30000);
+				return this;
+			}
+			public void Dispose()
+			{
+				_control87(cw, 0x30000);
+			}
+		}
+
+		private class Unix_FPCtrl : IFPCtrl
+		{
+			public IDisposable Save()
+			{
+				return this;
+			}
+			public void Dispose()
+			{ }
+		}
+
+		IFPCtrl FP;
+
+		#endregion
+
 		#region Controller
 
 		public ControllerDefinition ControllerDefinition { get; private set; }
@@ -149,34 +203,37 @@ namespace BizHawk.Emulation.Cores.Consoles.Nintendo.QuickNES
 		public bool FrameAdvance(IController controller, bool render, bool rendersound = true)
 		{
 			CheckDisposed();
-			if (controller.IsPressed("Power"))
-				QN.qn_reset(Context, true);
-			if (controller.IsPressed("Reset"))
-				QN.qn_reset(Context, false);
+			using (FP.Save())
+			{
+				if (controller.IsPressed("Power"))
+					QN.qn_reset(Context, true);
+				if (controller.IsPressed("Reset"))
+					QN.qn_reset(Context, false);
 
-			int j1, j2;
-			SetPads(controller, out j1, out j2);
+				int j1, j2;
+				SetPads(controller, out j1, out j2);
 
-			if (Tracer.Enabled)
-				QN.qn_set_tracecb(Context, _tracecb);
-			else
-				QN.qn_set_tracecb(Context, null);
+				if (Tracer.Enabled)
+					QN.qn_set_tracecb(Context, _tracecb);
+				else
+					QN.qn_set_tracecb(Context, null);
 
-			Frame++;
-			LibQuickNES.ThrowStringError(QN.qn_emulate_frame(Context, j1, j2));
-			IsLagFrame = QN.qn_get_joypad_read_count(Context) == 0;
-			if (IsLagFrame)
-				LagCount++;
+				Frame++;
+				LibQuickNES.ThrowStringError(QN.qn_emulate_frame(Context, j1, j2));
+				IsLagFrame = QN.qn_get_joypad_read_count(Context) == 0;
+				if (IsLagFrame)
+					LagCount++;
 
-			if (render)
-				Blit();
-			if (rendersound)
-				DrainAudio();
+				if (render)
+					Blit();
+				if (rendersound)
+					DrainAudio();
 
-			if (CB1 != null) CB1();
-			if (CB2 != null) CB2();
+				if (CB1 != null) CB1();
+				if (CB2 != null) CB2();
 
-			return true;
+				return true;
+			}
 		}
 
 		IntPtr Context;