Intellivision - implement the BoardName property

BizHawk.Emulation.Cores/Consoles/Intellivision/Cartridge.cs

@@ -14,7 +14,9 @@ namespace BizHawk.Emulation.Cores.Intellivision
 
 		// There are 10 mappers Intellivision games use (not counting intellicart which is handled seperately)
 		// we will pick the mapper from the game DB and default to 0
-		private int mapper = 0; 
+		private int mapper = 0;
+
+		public string BoardName => $"Mapper {mapper}";
 
 		public void SyncState(Serializer ser)
 		{

BizHawk.Emulation.Cores/Consoles/Intellivision/ICart.cs

@@ -9,5 +9,7 @@ namespace BizHawk.Emulation.Cores.Intellivision
 		bool WriteCart(ushort addr, ushort value, bool poke);
 
 		void SyncState(Serializer ser);
+
+		string BoardName { get; }
 	}
 }

BizHawk.Emulation.Cores/Consoles/Intellivision/Intellicart.cs

@@ -5,6 +5,8 @@ namespace BizHawk.Emulation.Cores.Intellivision
 {
 	public sealed class Intellicart : ICart
 	{
+		public string BoardName => $"Intellicart";
+
 		public void SyncState(Serializer ser)
 		{
 			ser.BeginSection("Cart");

BizHawk.Emulation.Cores/Consoles/Intellivision/Intellivision.IEmulator.cs

@@ -125,8 +125,7 @@ namespace BizHawk.Emulation.Cores.Intellivision
 
 		public bool DeterministicEmulation => true;
 
-		[FeatureNotImplemented]
-		public string BoardName => null;
+		public string BoardName => _cart.BoardName;
 
 		public void ResetCounters()
 		{