diff --git a/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.MenuItems.cs b/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.MenuItems.cs
index eebc6e734b..3bf28f55d2 100644
--- a/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.MenuItems.cs
+++ b/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.MenuItems.cs
@@ -25,6 +25,11 @@ namespace BizHawk.Client.EmuHawk
 			SaveTASMenuItem.Enabled =
 				!string.IsNullOrWhiteSpace(CurrentTasMovie.Filename) &&
 				(CurrentTasMovie.Filename != DefaultTasProjName());
+
+			SaveTASMenuItem.Enabled =
+			SaveAsTASMenuItem.Enabled =
+				!_saveBackgroundWorker.IsBusy;
+
 		}
 
 		private void RecentSubMenu_DropDownOpened(object sender, EventArgs e)
diff --git a/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs b/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs
index 304dc65aee..39726deff9 100644
--- a/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs
@@ -667,6 +667,36 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 					mm.Add(MemoryDomain.FromIntPtrSwap16(name, size, MemoryDomain.Endian.Big, area, writable: true, byteSize: byteSize));
 				}
 			}
+			mm.Add(new MemoryDomain("M68K BUS", 0x1000000, MemoryDomain.Endian.Big,
+				delegate(long addr)
+				{
+					var a = (uint)addr;
+					if (a >= 0x1000000)
+						throw new ArgumentOutOfRangeException();
+					return LibGPGX.gpgx_peek_m68k_bus(a);
+				},
+				delegate(long addr, byte val)
+				{
+					var a = (uint)addr;
+					if (a >= 0x1000000)
+						throw new ArgumentOutOfRangeException();
+					LibGPGX.gpgx_write_m68k_bus(a, val);
+				}, 2));
+			mm.Add(new MemoryDomain("S68K BUS", 0x1000000, MemoryDomain.Endian.Big,
+				delegate(long addr)
+				{
+					var a = (uint)addr;
+					if (a >= 0x1000000)
+						throw new ArgumentOutOfRangeException();
+					return LibGPGX.gpgx_peek_s68k_bus(a);
+				},
+				delegate(long addr, byte val)
+				{
+					var a = (uint)addr;
+					if (a >= 0x1000000)
+						throw new ArgumentOutOfRangeException();
+					LibGPGX.gpgx_write_s68k_bus(a, val);
+				}, 2));
 			MemoryDomains = new MemoryDomainList(mm);
 			(ServiceProvider as BasicServiceProvider).Register<IMemoryDomains>(MemoryDomains);
 		}
diff --git a/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/LibGPGX.cs b/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/LibGPGX.cs
index 0399d95383..1a87dc8b4a 100644
--- a/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/LibGPGX.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Sega/gpgx/LibGPGX.cs
@@ -320,5 +320,15 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 
 		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]
 		public static extern void gpgx_set_draw_mask(DrawMask mask);
+
+		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern void gpgx_write_m68k_bus(uint addr, byte data);
+		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern void gpgx_write_s68k_bus(uint addr, byte data);
+		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern byte gpgx_peek_m68k_bus(uint addr);
+		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern byte gpgx_peek_s68k_bus(uint addr);
+
 	}
 }
diff --git a/genplus-gx/cinterface/cinterface.c b/genplus-gx/cinterface/cinterface.c
index 4b2f238570..96ae87c414 100644
--- a/genplus-gx/cinterface/cinterface.c
+++ b/genplus-gx/cinterface/cinterface.c
@@ -423,6 +423,36 @@ GPGX_EX const char* gpgx_get_memdom(int which, void **area, int *size)
 	}
 }
 
+GPGX_EX void gpgx_write_m68k_bus(unsigned addr, unsigned data)
+{
+	unsigned char *base = m68k.memory_map[addr >> 16 & 0xff].base;
+	if (base)
+		base[addr & 0xffff ^ 1] = data;
+}
+
+GPGX_EX void gpgx_write_s68k_bus(unsigned addr, unsigned data)
+{
+	unsigned char *base = s68k.memory_map[addr >> 16 & 0xff].base;
+	if (base)
+		base[addr & 0xffff ^ 1] = data;
+}
+GPGX_EX unsigned gpgx_peek_m68k_bus(unsigned addr)
+{
+	unsigned char *base = m68k.memory_map[addr >> 16 & 0xff].base;
+	if (base)
+		return base[addr & 0xffff ^ 1];
+	else
+		return 0xff;
+}
+GPGX_EX unsigned gpgx_peek_s68k_bus(unsigned addr)
+{
+	unsigned char *base = s68k.memory_map[addr >> 16 & 0xff].base;
+	if (base)
+		return base[addr & 0xffff ^ 1];
+	else
+		return 0xff;
+}
+
 GPGX_EX void gpgx_get_sram(void **area, int *size)
 {
 	if (!area || !size)
diff --git a/output/dll/libgenplusgx.dll b/output/dll/libgenplusgx.dll
index 5c5d2f008a..c03579c4ff 100644
Binary files a/output/dll/libgenplusgx.dll and b/output/dll/libgenplusgx.dll differ