diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/AVE-NINA.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/AVE-NINA.cs
index 227d37a529..29a61de7b5 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/AVE-NINA.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/AVE-NINA.cs
@@ -122,6 +122,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 				case "AVE-NINA-06": //Blackjack (U)
 				case "AVE-NINA-03": //F-15 City War (U)
 				case "AVE-MB-91": //Deathbots (U)
+					if (Cart.chips.Count == 0) // some boards had no mapper chips on them
+						return false;
 					AssertPrg(32, 64); AssertChr(32, 64); AssertWram(0); AssertVram(0);
 					break;
 
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Camerica.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Camerica.cs
index 60418cd8e7..88f092359b 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Camerica.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Camerica.cs
@@ -120,7 +120,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 				case "MAPPER232":
 					break;
 				case "CAMERICA-ALGQ": //Quattro Adventure (U)
-				case "CAMERICA-9096": //Quattro Arcade (U)
+				case "CAMERICA-BF9096": //Quattro Arcade (U)
 					AssertPrg(256); AssertChr(0); AssertWram(0); AssertVram(8);
 					break;
 				default:
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/ExROM.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/ExROM.cs
index d3eef28a95..7cd054c94a 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/ExROM.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/ExROM.cs
@@ -114,6 +114,9 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 				case "NES-ETROM":
 				case "HVC-ETROM":
 					break;
+				case "NES-EWROM":
+				case "HVC-EWROM":
+					break;
 				default:
 					return false;
 			}
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper069.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper069.cs
index e84a71de02..7f0547adbf 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper069.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/Mapper069.cs
@@ -98,7 +98,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 			//configure
 			switch (Cart.board_type)
 			{
-				case "NES-JLROM": //mr gimmick!
+				case "NES-JLROM": // Mr Gimmick
 					AssertPrg(256); AssertChr(128); AssertWram(0); AssertVram(0); AssertBattery(false);
 					break;
 				case "NES-JSROM": // batman(E)
@@ -110,10 +110,10 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 					AssertPrg(128); AssertChr(128); AssertWram(0); AssertVram(0); AssertBattery(false);
 					break;
 				case "SUNSOFT-FME-7": //Barcode World (J)
-					AssertPrg(128,256); AssertChr(128,256); AssertWram(0,8); AssertVram(0);
+					AssertPrg(128, 256); AssertChr(128, 256); AssertWram(0, 8); AssertVram(0);
 					break;
-				case "NES-BTR": //Batman - Return of the Joker (U)
-					AssertPrg(128); AssertChr(256); AssertWram(8); AssertVram(0); AssertBattery(false);
+				case "NES-BTR": //Batman - Return of the Joker (U), Mr Gimmick (Proto)
+					AssertPrg(128, 256); AssertChr(128, 256); AssertWram(0, 8); AssertVram(0); AssertBattery(false);
 					break;
 				default:
 					return false;
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/NROM.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/NROM.cs
index d9e3a1f265..341e32d877 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/NROM.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/NROM.cs
@@ -39,9 +39,18 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 				case "HVC-SROM":
 				case "SETA-NROM-128":
 				case "BANDAI-NROM-128":
+				case "JALECO-JF-03":
+				case "NAMCOT-3305":
+				case "SUNSOFT-NROM-256":
 					AssertPrg(8, 16, 32); 
 					AssertChr(8); AssertVram(0); AssertWram(0, 8);
 					break;
+				case "AVE-NINA-03":
+					if (Cart.chips.Count != 0)
+						return false;
+					AssertPrg(8, 16, 32); 
+					AssertChr(8); AssertVram(0); AssertWram(0);
+					break;
 
 				default:
 					return false;
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/PxROM_FxROM.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/PxROM_FxROM.cs
index ace49f9bc0..dc5fb3a644 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/PxROM_FxROM.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/PxROM_FxROM.cs
@@ -47,6 +47,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 
 				case "NES-PNROM": //punch-out!!
 				case "HVC-PEEOROM":
+				case "NES-PEEOROM":
 					AssertPrg(128); AssertChr(128); AssertWram(0); AssertVram(0);
 					break;
 				
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/SxROM.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/SxROM.cs
index 70e7d745ca..9e642d3f05 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/SxROM.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/NES/Boards/SxROM.cs
@@ -388,6 +388,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
 					break;
 				case "NES-SNROM": //dragon warrior 2
 				case "HVC-SNROM":
+				case "VIRGIN-SNROM":
 					AssertPrg(128, 256); AssertChr(0); AssertVram(8); AssertWram(8);
 					break;
 				case "SxROM-JUNK":