Cheats dialog - default to System Bus domain

BizHawk.Client.EmuHawk/tools/Cheats/CheatEdit.cs

@@ -37,7 +37,15 @@ namespace BizHawk.Client.EmuHawk
 				DomainDropDown.Items.AddRange(Core.MemoryDomains
 					.Select(d => d.ToString())
 					.ToArray());
-				DomainDropDown.SelectedItem = Core.MemoryDomains.MainMemory.ToString();
+
+				if (Core.MemoryDomains.HasSystemBus)
+				{
+					DomainDropDown.SelectedItem = Core.MemoryDomains.SystemBus.ToString();
+				}
+				else
+				{
+					DomainDropDown.SelectedItem = Core.MemoryDomains.MainMemory.ToString();
+				}
 			}
 
 			SetFormToDefault();

BizHawk.Emulation.Common/MemoryDomain.cs

@@ -214,5 +214,21 @@ namespace BizHawk.Emulation.Common
 				return this[_mainMemoryIndex];
 			}
 		}
+
+		public bool HasSystemBus
+		{
+			get
+			{
+				return this.Any(x => x.Name == "System Bus" || x.Name == "BUS"); // Have to account for "BUS" because some developers don't like consistency!
+			}
+		}
+
+		public MemoryDomain SystemBus
+		{
+			get
+			{
+				return this.FirstOrDefault(x => x.Name == "System Bus" || x.Name == "BUS");
+			}
+		}
 	}
 }