diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/BoardSystem.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/BoardSystem.cs
index af1666341f..e05e78f8cb 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/BoardSystem.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/BoardSystem.cs
@@ -2,6 +2,7 @@
 using System.Xml;
 using System.IO;
 using System.Collections.Generic;
+using System.Linq;
 
 using BizHawk.Common;
 using BizHawk.Emulation.Common;
@@ -53,7 +54,6 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			Dictionary<string, string> InitialRegisterValues { get; set; }
 		};
 
-
 		[INESBoardImpl]
 		public abstract class NESBoardBase : INESBoard
 		{
@@ -682,4 +682,54 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			}
 		}
 	}
+
+	[AttributeUsage(AttributeTargets.Field)]
+	public class MapperPropAttribute : Attribute
+	{
+		public string Name { get; private set; }
+		public MapperPropAttribute(string Name)
+		{
+			this.Name = Name;
+		}
+		public MapperPropAttribute()
+		{
+			this.Name = null;
+		}
+	}
+
+	public static class AutoMapperProps
+	{
+		public static void Apply(NES.INESBoard board)
+		{
+			var fields = board.GetType().GetFields();
+			foreach (var field in fields)
+			{
+				var attribs = field.GetCustomAttributes(false);
+				foreach (var attrib in attribs)
+				{
+					if (attrib is MapperPropAttribute)
+					{
+						string Name = ((MapperPropAttribute)attrib).Name ?? field.Name;
+
+						string Value;
+						if (board.InitialRegisterValues.TryGetValue(Name, out Value))
+						{
+							try
+							{
+								field.SetValue(board, Convert.ChangeType(Value, field.FieldType));
+							}
+							catch (Exception e)
+							{
+								if (e is InvalidCastException || e is FormatException || e is OverflowException)
+									throw new InvalidDataException("Auto Mapper Properties were in a bad format!", e);
+								else
+									throw e;
+							}
+						}
+						break;
+					}
+				}
+			}
+		}
+	}
 }
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MLT-ACTION52.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MLT-ACTION52.cs
index 58a2e2141e..4e815f13a2 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MLT-ACTION52.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/MLT-ACTION52.cs
@@ -76,8 +76,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 		PRG Mode 1: |     $8000     |     $8000     |
 					+---------------+---------------+
 		*/
-		public bool prg_mode;
-		public int prg_reg;
+		[MapperProp]
+		public bool prg_mode = false;
+		[MapperProp]
+		public int prg_reg = 0;
 		public int chr_reg;
 		public int chip_offset;
 		public bool cheetahmen = false;
@@ -104,8 +106,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 				cheetahmen = true;
 			}
 
-			prg_mode = bool.Parse(InitialRegisterValues.GetValueOrDefault("prg_mode", "false"));
-			prg_reg = int.Parse(InitialRegisterValues.GetValueOrDefault("prg_reg", "0"));
+			AutoMapperProps.Apply(this);
 
 			return true;
 		}