diff --git a/src/debugger/gui/CartBUSWidget.cxx b/src/debugger/gui/CartBUSWidget.cxx
index 903bd3d42..c9b6eb3f3 100644
--- a/src/debugger/gui/CartBUSWidget.cxx
+++ b/src/debugger/gui/CartBUSWidget.cxx
@@ -250,6 +250,8 @@ void CartridgeBUSWidget::saveOldState()
   myOldState.mwavesizes.clear();
   myOldState.internalram.clear();
   myOldState.samplepointer.clear();
+  myOldState.armStats.clear();
+  myOldState.armPrevStats.clear();
 
   for(uInt32 i = 0; i < 18; ++i)
   {
@@ -290,6 +292,18 @@ void CartridgeBUSWidget::saveOldState()
     myOldState.internalram.push_back(myCart.myRAM[i]);
 
   myOldState.samplepointer.push_back(myCart.getSample());
+
+  myOldState.armStats.push_back(myCart.stats().fetches
+                                + myCart.stats().reads + myCart.stats().writes);
+  myOldState.armStats.push_back(myCart.stats().fetches);
+  myOldState.armStats.push_back(myCart.stats().reads);
+  myOldState.armStats.push_back(myCart.stats().writes);
+
+  myOldState.armPrevStats.push_back(myCart.prevStats().fetches
+                                    + myCart.prevStats().reads + myCart.prevStats().writes);
+  myOldState.armPrevStats.push_back(myCart.prevStats().fetches);
+  myOldState.armPrevStats.push_back(myCart.prevStats().reads);
+  myOldState.armPrevStats.push_back(myCart.prevStats().writes);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -416,25 +430,37 @@ void CartridgeBUSWidget::loadConfig()
     mySamplePointer->setCrossed(true);
   }
 
+  bool isChanged;
+
+  isChanged = myCart.prevStats().fetches + myCart.prevStats().reads + myCart.prevStats().writes
+    != myOldState.armPrevStats[0];
   myPrevThumbMemCycles->setText(Common::Base::toString(myCart.prevStats().fetches
                                 + myCart.prevStats().reads + myCart.prevStats().writes,
-                                Common::Base::Fmt::_10_6));
+                                Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.prevStats().fetches != myOldState.armPrevStats[1];
   myPrevThumbFetches->setText(Common::Base::toString(myCart.prevStats().fetches,
-                              Common::Base::Fmt::_10_6));
+                              Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.prevStats().reads != myOldState.armPrevStats[2];
   myPrevThumbReads->setText(Common::Base::toString(myCart.prevStats().reads,
-                            Common::Base::Fmt::_10_6));
+                            Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.prevStats().writes != myOldState.armPrevStats[3];
   myPrevThumbWrites->setText(Common::Base::toString(myCart.prevStats().writes,
-                             Common::Base::Fmt::_10_6));
+                             Common::Base::Fmt::_10_6), isChanged);
 
+  isChanged = myCart.stats().fetches + myCart.stats().reads + myCart.stats().writes
+    != myOldState.armStats[0];
   myThumbMemCycles->setText(Common::Base::toString(myCart.stats().fetches
                             + myCart.stats().reads + myCart.stats().writes,
-                            Common::Base::Fmt::_10_6));
+                            Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.stats().fetches != myOldState.armStats[1];
   myThumbFetches->setText(Common::Base::toString(myCart.stats().fetches,
-                          Common::Base::Fmt::_10_6));
+                          Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.stats().reads != myOldState.armStats[2];
   myThumbReads->setText(Common::Base::toString(myCart.stats().reads,
-                        Common::Base::Fmt::_10_6));
+                        Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.stats().writes != myOldState.armStats[3];
   myThumbWrites->setText(Common::Base::toString(myCart.stats().writes,
-                         Common::Base::Fmt::_10_6));
+                         Common::Base::Fmt::_10_6), isChanged);
 
   CartDebugWidget::loadConfig();
 }
diff --git a/src/debugger/gui/CartBUSWidget.hxx b/src/debugger/gui/CartBUSWidget.hxx
index 72fb6ffd3..493c6488c 100644
--- a/src/debugger/gui/CartBUSWidget.hxx
+++ b/src/debugger/gui/CartBUSWidget.hxx
@@ -47,6 +47,8 @@ class CartridgeBUSWidget : public CartDebugWidget
       IntArray mwaves;
       IntArray mwavesizes;
       IntArray samplepointer;
+      uIntArray armStats;
+      uIntArray armPrevStats;
       uInt32 random{0};
       ByteArray internalram;
     };
diff --git a/src/debugger/gui/CartCDFWidget.cxx b/src/debugger/gui/CartCDFWidget.cxx
index 78748c442..a26923d92 100644
--- a/src/debugger/gui/CartCDFWidget.cxx
+++ b/src/debugger/gui/CartCDFWidget.cxx
@@ -266,6 +266,8 @@ void CartridgeCDFWidget::saveOldState()
   myOldState.mwavesizes.clear();
   myOldState.internalram.clear();
   myOldState.samplepointer.clear();
+  myOldState.armStats.clear();
+  myOldState.armPrevStats.clear();
 
   for(uInt32 i = 0; i < static_cast<uInt32>((isCDFJ() || isCDFJplus()) ? 35 : 34); ++i)
   {
@@ -297,6 +299,18 @@ void CartridgeCDFWidget::saveOldState()
     myOldState.internalram.push_back(myCart.myRAM[i]);
 
   myOldState.samplepointer.push_back(myCart.getSample());
+
+  myOldState.armStats.push_back(myCart.stats().fetches
+                                + myCart.stats().reads + myCart.stats().writes);
+  myOldState.armStats.push_back(myCart.stats().fetches);
+  myOldState.armStats.push_back(myCart.stats().reads);
+  myOldState.armStats.push_back(myCart.stats().writes);
+
+  myOldState.armPrevStats.push_back(myCart.prevStats().fetches
+                                    + myCart.prevStats().reads + myCart.prevStats().writes);
+  myOldState.armPrevStats.push_back(myCart.prevStats().fetches);
+  myOldState.armPrevStats.push_back(myCart.prevStats().reads);
+  myOldState.armPrevStats.push_back(myCart.prevStats().writes);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -428,25 +442,37 @@ void CartridgeCDFWidget::loadConfig()
     mySamplePointer->setCrossed(true);
   }
 
+  bool isChanged;
+
+  isChanged = myCart.prevStats().fetches + myCart.prevStats().reads + myCart.prevStats().writes
+    != myOldState.armPrevStats[0];
   myPrevThumbMemCycles->setText(Common::Base::toString(myCart.prevStats().fetches
                                 + myCart.prevStats().reads + myCart.prevStats().writes,
-                                Common::Base::Fmt::_10_6));
+                                Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.prevStats().fetches != myOldState.armPrevStats[1];
   myPrevThumbFetches->setText(Common::Base::toString(myCart.prevStats().fetches,
-                              Common::Base::Fmt::_10_6));
+                              Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.prevStats().reads != myOldState.armPrevStats[2];
   myPrevThumbReads->setText(Common::Base::toString(myCart.prevStats().reads,
-                            Common::Base::Fmt::_10_6));
+                            Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.prevStats().writes != myOldState.armPrevStats[3];
   myPrevThumbWrites->setText(Common::Base::toString(myCart.prevStats().writes,
-                             Common::Base::Fmt::_10_6));
+                             Common::Base::Fmt::_10_6), isChanged);
 
+  isChanged = myCart.stats().fetches + myCart.stats().reads + myCart.stats().writes
+    != myOldState.armStats[0];
   myThumbMemCycles->setText(Common::Base::toString(myCart.stats().fetches
                             + myCart.stats().reads + myCart.stats().writes,
-                            Common::Base::Fmt::_10_6));
+                            Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.stats().fetches != myOldState.armStats[1];
   myThumbFetches->setText(Common::Base::toString(myCart.stats().fetches,
-                          Common::Base::Fmt::_10_6));
+                          Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.stats().reads != myOldState.armStats[2];
   myThumbReads->setText(Common::Base::toString(myCart.stats().reads,
-                        Common::Base::Fmt::_10_6));
+                        Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.stats().writes != myOldState.armStats[3];
   myThumbWrites->setText(Common::Base::toString(myCart.stats().writes,
-                         Common::Base::Fmt::_10_6));
+                         Common::Base::Fmt::_10_6), isChanged);
 
   CartDebugWidget::loadConfig();
 }
diff --git a/src/debugger/gui/CartCDFWidget.hxx b/src/debugger/gui/CartCDFWidget.hxx
index b8269e4bf..34f177bc6 100644
--- a/src/debugger/gui/CartCDFWidget.hxx
+++ b/src/debugger/gui/CartCDFWidget.hxx
@@ -48,6 +48,8 @@ class CartridgeCDFWidget : public CartDebugWidget
       IntArray mwaves;
       IntArray mwavesizes;
       IntArray samplepointer;
+      uIntArray armStats;
+      uIntArray armPrevStats;
       uInt32 random{0};
       ByteArray internalram;
     };
diff --git a/src/debugger/gui/CartDPCPlusWidget.cxx b/src/debugger/gui/CartDPCPlusWidget.cxx
index 4555e001e..71ad351fd 100644
--- a/src/debugger/gui/CartDPCPlusWidget.cxx
+++ b/src/debugger/gui/CartDPCPlusWidget.cxx
@@ -246,6 +246,8 @@ void CartridgeDPCPlusWidget::saveOldState()
   myOldState.mfreqs.clear();
   myOldState.mwaves.clear();
   myOldState.internalram.clear();
+  myOldState.armStats.clear();
+  myOldState.armPrevStats.clear();
 
   for(uInt32 i = 0; i < 8; ++i)
   {
@@ -269,6 +271,18 @@ void CartridgeDPCPlusWidget::saveOldState()
     myOldState.internalram.push_back(myCart.myDisplayImage[i]);
 
   myOldState.bank = myCart.getBank();
+
+  myOldState.armStats.push_back(myCart.stats().fetches
+                                + myCart.stats().reads + myCart.stats().writes);
+  myOldState.armStats.push_back(myCart.stats().fetches);
+  myOldState.armStats.push_back(myCart.stats().reads);
+  myOldState.armStats.push_back(myCart.stats().writes);
+
+  myOldState.armPrevStats.push_back(myCart.prevStats().fetches
+                                    + myCart.prevStats().reads + myCart.prevStats().writes);
+  myOldState.armPrevStats.push_back(myCart.prevStats().fetches);
+  myOldState.armPrevStats.push_back(myCart.prevStats().reads);
+  myOldState.armPrevStats.push_back(myCart.prevStats().writes);
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -359,25 +373,37 @@ void CartridgeDPCPlusWidget::loadConfig()
   myFastFetch->setState(myCart.myFastFetch);
   myIMLDA->setState(myCart.myLDAimmediate);
 
+  bool isChanged;
+
+  isChanged = myCart.prevStats().fetches + myCart.prevStats().reads + myCart.prevStats().writes
+    != myOldState.armPrevStats[0];
   myPrevThumbMemCycles->setText(Common::Base::toString(myCart.prevStats().fetches
                                 + myCart.prevStats().reads + myCart.prevStats().writes,
-                                Common::Base::Fmt::_10_6));
+                                Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.prevStats().fetches != myOldState.armPrevStats[1];
   myPrevThumbFetches->setText(Common::Base::toString(myCart.prevStats().fetches,
-                              Common::Base::Fmt::_10_6));
+                              Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.prevStats().reads != myOldState.armPrevStats[2];
   myPrevThumbReads->setText(Common::Base::toString(myCart.prevStats().reads,
-                            Common::Base::Fmt::_10_6));
+                            Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.prevStats().writes != myOldState.armPrevStats[3];
   myPrevThumbWrites->setText(Common::Base::toString(myCart.prevStats().writes,
-                             Common::Base::Fmt::_10_6));
+                             Common::Base::Fmt::_10_6), isChanged);
 
+  isChanged = myCart.stats().fetches + myCart.stats().reads + myCart.stats().writes
+    != myOldState.armStats[0];
   myThumbMemCycles->setText(Common::Base::toString(myCart.stats().fetches
                             + myCart.stats().reads + myCart.stats().writes,
-                            Common::Base::Fmt::_10_6));
+                            Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.stats().fetches != myOldState.armStats[1];
   myThumbFetches->setText(Common::Base::toString(myCart.stats().fetches,
-                          Common::Base::Fmt::_10_6));
+                          Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.stats().reads != myOldState.armStats[2];
   myThumbReads->setText(Common::Base::toString(myCart.stats().reads,
-                        Common::Base::Fmt::_10_6));
+                        Common::Base::Fmt::_10_6), isChanged);
+  isChanged = myCart.stats().writes != myOldState.armStats[3];
   myThumbWrites->setText(Common::Base::toString(myCart.stats().writes,
-                         Common::Base::Fmt::_10_6));
+                         Common::Base::Fmt::_10_6), isChanged);
 
   CartDebugWidget::loadConfig();
 }
diff --git a/src/debugger/gui/CartDPCPlusWidget.hxx b/src/debugger/gui/CartDPCPlusWidget.hxx
index 0251e519a..61d8e936d 100644
--- a/src/debugger/gui/CartDPCPlusWidget.hxx
+++ b/src/debugger/gui/CartDPCPlusWidget.hxx
@@ -46,6 +46,8 @@ class CartridgeDPCPlusWidget : public CartDebugWidget
       IntArray mcounters;
       IntArray mfreqs;
       IntArray mwaves;
+      uIntArray armStats;
+      uIntArray armPrevStats;
       uInt32 random{0};
       ByteArray internalram;
       uInt16 bank{0};