NES: correctly treat audio ram on Namco 163 as battery backed when the board has a battery and there's no WRAM. fixes King of Kings saving, amongst others.

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/NAMCOT_m19_m210.cs

@@ -317,5 +317,20 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 				}
 			}
 		}
+
+		public override byte[] SaveRam
+		{
+			get
+			{
+				if (Cart.wram_battery)
+				{
+					if (WRAM != null)
+						return WRAM;
+					else if (audio != null)
+						return audio.GetSaveRam();
+				}
+				return null;
+			}
+		}
 	}
 }

BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Namcot1xx/Namco163Audio.cs

@@ -113,5 +113,12 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 		{
 			this.enqueuer = enqueuer;
 		}
+
+		// the sound ram can be uesd for arbitrary load\store of data,
+		// and can be batteryed, and some games actually did this
+		public byte[] GetSaveRam()
+		{
+			return ram;
+		}
 	}
 }