diff --git a/src/emucore/tia/frame-manager/FrameManager.cxx b/src/emucore/tia/frame-manager/FrameManager.cxx
index 56cd24145..02196d06d 100644
--- a/src/emucore/tia/frame-manager/FrameManager.cxx
+++ b/src/emucore/tia/frame-manager/FrameManager.cxx
@@ -31,12 +31,7 @@ enum Metrics: uInt32 {
   vsync                         = 3,
   maxLinesVsync                 = 50,
   visibleOverscan               = 20,
-  tvModeDetectionTolerance      = 20,
-  initialGarbageFrames          = TIAConstants::initialGarbageFrames,
-  minStableFrames               = 10,
-  maxStabilizationFrames        = 20,
-  minDeltaForJitter             = 3,
-  framesForStableHeight         = 2
+  initialGarbageFrames          = TIAConstants::initialGarbageFrames
 };
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
diff --git a/src/emucore/tia/frame-manager/YStartDetector.cxx b/src/emucore/tia/frame-manager/YStartDetector.cxx
index 01b68a0ec..ef266e94f 100644
--- a/src/emucore/tia/frame-manager/YStartDetector.cxx
+++ b/src/emucore/tia/frame-manager/YStartDetector.cxx
@@ -26,7 +26,7 @@ enum Metrics: uInt32 {
   frameLinesPAL             = 312,
   vblankNTSC                = 37,
   vblankPAL                 = 45,
-  waitForVsync              = 32,
+  waitForVsync              = 50,
   tvModeDetectionTolerance  = 20,
   maxUnderscan              = 10,
   maxVblankViolations       = 2,
diff --git a/src/emucore/tia/frame-manager/YStartDetector.hxx b/src/emucore/tia/frame-manager/YStartDetector.hxx
index 121f9c39f..b02ce3de2 100644
--- a/src/emucore/tia/frame-manager/YStartDetector.hxx
+++ b/src/emucore/tia/frame-manager/YStartDetector.hxx
@@ -20,6 +20,10 @@
 
 #include "AbstractFrameManager.hxx"
 
+/**
+ * This frame manager detects ystart from the first line with vblank = off.
+ */
+
 class YStartDetector: public AbstractFrameManager {
 
   public: