diff --git a/src/debugger/TIADebug.cxx b/src/debugger/TIADebug.cxx
index 80a790fb3..b2e1ad755 100644
--- a/src/debugger/TIADebug.cxx
+++ b/src/debugger/TIADebug.cxx
@@ -108,6 +108,16 @@ const DebuggerState& TIADebug::getState()
   myState.aud.push_back(audV0());
   myState.aud.push_back(audV1());
 
+  // internal TIA state
+  myState.info.clear();
+  myState.info.push_back(frameCount());
+  myState.info.push_back(frameCycles());
+  myState.info.push_back(vsyncAsInt());
+  myState.info.push_back(vblankAsInt());
+  myState.info.push_back(scanlines());
+  myState.info.push_back(scanlinesLastFrame());
+  myState.info.push_back(clocksThisLine());
+
   return myState;
 }
 
@@ -168,6 +178,16 @@ void TIADebug::saveOldState()
   myOldState.aud.push_back(audC1());
   myOldState.aud.push_back(audV0());
   myOldState.aud.push_back(audV1());
+
+  // internal TIA state
+  myOldState.info.clear();
+  myOldState.info.push_back(frameCount());
+  myOldState.info.push_back(frameCycles());
+  myOldState.info.push_back(vsyncAsInt());
+  myOldState.info.push_back(vblankAsInt());
+  myOldState.info.push_back(scanlines());
+  myOldState.info.push_back(scanlinesLastFrame());
+  myOldState.info.push_back(clocksThisLine());
 }
 
 /* the set methods now use mySystem.poke(). This will save us the
diff --git a/src/debugger/TIADebug.hxx b/src/debugger/TIADebug.hxx
index 38dd9e6dd..55fe764d0 100644
--- a/src/debugger/TIADebug.hxx
+++ b/src/debugger/TIADebug.hxx
@@ -45,6 +45,7 @@ class TiaState : public DebuggerState
     IntArray pf;
     IntArray size;
     IntArray aud;
+    IntArray info;
 };
 
 class TIADebug : public DebuggerSystem
diff --git a/src/debugger/gui/TiaInfoWidget.cxx b/src/debugger/gui/TiaInfoWidget.cxx
index 224c26690..abacbf2fa 100644
--- a/src/debugger/gui/TiaInfoWidget.cxx
+++ b/src/debugger/gui/TiaInfoWidget.cxx
@@ -127,19 +127,26 @@ void TiaInfoWidget::loadConfig()
 {
   Debugger& dbg = instance().debugger();
   TIADebug& tia = dbg.tiaDebug();
+  const TiaState& oldTia = static_cast<const TiaState&>(tia.getOldState());
 
-  myFrameCount->setText("  " + Common::Base::toString(tia.frameCount(), Common::Base::F_10));
-  myFrameCycles->setText("  " + Common::Base::toString(tia.frameCycles(), Common::Base::F_10));
+  myFrameCount->setText("  " + Common::Base::toString(tia.frameCount(), Common::Base::F_10),
+                        tia.frameCount() != oldTia.info[0]);
+  myFrameCycles->setText("  " + Common::Base::toString(tia.frameCycles(), Common::Base::F_10),
+                         tia.frameCycles() != oldTia.info[1]);
 
-  myVSync->setState(tia.vsync());
-  myVBlank->setState(tia.vblank());
+  myVSync->setState(tia.vsync(), tia.vsyncAsInt() != oldTia.info[2]);
+  myVBlank->setState(tia.vblank(), tia.vblankAsInt() != oldTia.info[3]);
 
   int clk = tia.clocksThisLine();
-  myScanlineCount->setText(
-      Common::Base::toString(tia.scanlines(), Common::Base::F_10));
+  myScanlineCount->setText(Common::Base::toString(tia.scanlines(), Common::Base::F_10),
+                           tia.scanlines() != oldTia.info[4]);
   myScanlineCountLast->setText(
-      Common::Base::toString(tia.scanlinesLastFrame(), Common::Base::F_10));
-  myScanlineCycles->setText(Common::Base::toString(clk/3, Common::Base::F_10));
-  myPixelPosition->setText(Common::Base::toString(clk-68, Common::Base::F_10));
-  myColorClocks->setText(Common::Base::toString(clk, Common::Base::F_10));
+    Common::Base::toString(tia.scanlinesLastFrame(), Common::Base::F_10),
+    tia.scanlinesLastFrame() != oldTia.info[5]);
+  myScanlineCycles->setText(Common::Base::toString(clk/3, Common::Base::F_10),
+                            clk != oldTia.info[6]);
+  myPixelPosition->setText(Common::Base::toString(clk-68, Common::Base::F_10),
+                           clk != oldTia.info[6]);
+  myColorClocks->setText(Common::Base::toString(clk, Common::Base::F_10),
+                         clk != oldTia.info[6]);
 }
diff --git a/src/gui/Widget.cxx b/src/gui/Widget.cxx
index 274b47346..3f963c08c 100644
--- a/src/gui/Widget.cxx
+++ b/src/gui/Widget.cxx
@@ -544,6 +544,7 @@ CheckboxWidget::CheckboxWidget(GuiObject* boss, const GUI::Font& font,
     _state(false),
     _holdFocus(true),
     _drawBox(true),
+    _changed(false),
     _fillColor(kColor),
     _boxY(0),
     _textY(0)
@@ -632,13 +633,14 @@ void CheckboxWidget::setFill(FillType type)
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void CheckboxWidget::setState(bool state)
+void CheckboxWidget::setState(bool state, bool changed)
 {
   if(_state != state)
   {
     _state = state;
     setDirty();
   }
+  _changed = changed;
 }
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@@ -651,14 +653,14 @@ void CheckboxWidget::drawWidget(bool hilite)
   if(_drawBox)
     s.box(_x, _y + _boxY, 14, 14, kColor, kShadowColor);
   // Do we draw a square or cross?
-  s.fillRect(_x + 2, _y + _boxY + 2, 10, 10, isEnabled() ? _bgcolor : kColor);
+  s.fillRect(_x + 2, _y + _boxY + 2, 10, 10, _changed ? kDbgChangedColor : isEnabled() ? _bgcolor : kColor);
   if(_state)
     s.drawBitmap(_img, _x + 3, _y + _boxY + 3, isEnabled() ? kCheckColor : kShadowColor);
 #else
   if(_drawBox)
     s.frameRect(_x, _y + _boxY, 14, 14, hilite ? kScrollColorHi : kShadowColor);
   // Do we draw a square or cross?
-  s.fillRect(_x + 1, _y + _boxY + 1, 12, 12, isEnabled() ? _bgcolor : kColor);
+  s.fillRect(_x + 1, _y + _boxY + 1, 12, 12, _changed ? kDbgChangedColor : isEnabled() ? _bgcolor : kColor);
   if(_state)
     s.drawBitmap(_img, _x + 2, _y + _boxY + 2, isEnabled()
                  ? hilite ? kScrollColorHi : kCheckColor
diff --git a/src/gui/Widget.hxx b/src/gui/Widget.hxx
index 047cebe01..b7430567a 100644
--- a/src/gui/Widget.hxx
+++ b/src/gui/Widget.hxx
@@ -263,7 +263,7 @@ class CheckboxWidget : public ButtonWidget
     void setEditable(bool editable);
     void setFill(FillType type);
 
-    void setState(bool state);
+    void setState(bool state, bool changed = false);
     void toggleState()     { setState(!_state); }
     bool getState() const  { return _state;     }
 
@@ -280,6 +280,7 @@ class CheckboxWidget : public ButtonWidget
     bool _state;
     bool _holdFocus;
     bool _drawBox;
+    bool _changed;
 
     uInt32* _img;
     uInt32  _fillColor;