diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper074.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper074.cs
index 234e3fbadf..f76fbc9fdc 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper074.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MMC3_family/Mapper074.cs
@@ -16,12 +16,14 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			{
 				case "MAPPER074":
 					break;
+				case "MAPPER224":
+					break;
 				default:
 					return false;
 			}
 			VRAM = new byte[2048];
-			//if (Cart.chr_size == 0)
-			//	throw new Exception("Mapper074 carts MUST have chr rom!");
+			if (Cart.chr_size == 0 && Cart.board_type == "MAPPER074") 
+				throw new Exception("Mapper074 carts MUST have chr rom!");
 			BaseSetup();
 			return true;
 		}