saturn: fix saveram problem

BizHawk.Emulation/Consoles/Sega/Saturn/Yabause.cs

@@ -26,6 +26,7 @@ namespace BizHawk.Emulation.Consoles.Sega.Saturn
 		GCHandle SoundHandle;
 
 		bool Disposed = false;
+		byte[] DisposedSaveRam;
 
 		LibYabause.CDInterface.Init InitH;
 		LibYabause.CDInterface.DeInit DeInitH;
@@ -182,6 +183,12 @@ namespace BizHawk.Emulation.Consoles.Sega.Saturn
 		#region saveram
 
 		public byte[] ReadSaveRam()
+		{
+			if (Disposed)
+			{
+				return DisposedSaveRam ?? new byte[0];
+			}
+			else
 			{
 				var ms = new MemoryStream();
 				var fp = new FilePiping();
@@ -197,7 +204,15 @@ namespace BizHawk.Emulation.Consoles.Sega.Saturn
 				return ret;
 			}
 
+		}
+
 		public void StoreSaveRam(byte[] data)
+		{
+			if (Disposed)
+			{
+				throw new Exception("It's a bit late for that");
+			}
+			else
 			{
 				var fp = new FilePiping();
 				fp.Offer(data);
@@ -208,15 +223,29 @@ namespace BizHawk.Emulation.Consoles.Sega.Saturn
 				if (!success)
 					throw new Exception("libyabause_loadsaveram() failed!");
 			}
+		}
 
 		public void ClearSaveRam()
+		{
+			if (Disposed)
+			{
+				throw new Exception("It's a bit late for that");
+			}
+			else
 			{
 				LibYabause.libyabause_clearsaveram();
 			}
+		}
 
 		public bool SaveRamModified
 		{
-			get { return LibYabause.libyabause_saveramodified(); }
+			get
+			{
+				if (Disposed)
+					return DisposedSaveRam != null;
+				else
+					return LibYabause.libyabause_saveramodified();
+			}
 			set { throw new InvalidOperationException("No you may not!"); }
 		}
 
@@ -407,6 +436,8 @@ namespace BizHawk.Emulation.Consoles.Sega.Saturn
 		{
 			if (!Disposed)
 			{
+				if (SaveRamModified)
+					DisposedSaveRam = ReadSaveRam();
 				LibYabause.libyabause_setvidbuff(IntPtr.Zero);
 				LibYabause.libyabause_setsndbuff(IntPtr.Zero);
 				LibYabause.libyabause_deinit();