diff --git a/src/emucore/Cart.cxx b/src/emucore/Cart.cxx
index 0386d72d7..337a2904a 100644
--- a/src/emucore/Cart.cxx
+++ b/src/emucore/Cart.cxx
@@ -641,14 +641,17 @@ bool Cartridge::isProbablyEF(const uInt8* image, uInt32 size)
   // EF cart bankswitching switches banks by accessing addresses 0xFE0
   // to 0xFEF, usually with either a NOP or LDA
   // It's likely that the code will switch to bank 0, so that's what is tested
-  uInt8 signature[2][3] = {
+  uInt8 signature[4][3] = {
     { 0x0C, 0xE0, 0xFF },  // NOP $FFE0
-    { 0xAD, 0xE0, 0xFF }   // LDA $FFE0
+    { 0xAD, 0xE0, 0xFF },  // LDA $FFE0
+    { 0x0C, 0xE0, 0x1F },  // NOP $1FE0
+    { 0xAD, 0xE0, 0x1F }   // LDA $1FE0
   };
-  if(searchForBytes(image, size, signature[0], 3, 1))
-    return true;
-  else
-    return searchForBytes(image, size, signature[1], 3, 1);
+  for(uInt32 i = 0; i < 4; ++i)
+    if(searchForBytes(image, size, signature[i], 3, 1))
+      return true;
+
+  return false;
 }
 
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