diff --git a/src/emucore/TIASurface.cxx b/src/emucore/TIASurface.cxx
index 46b2250c0..d0c4ffe2c 100644
--- a/src/emucore/TIASurface.cxx
+++ b/src/emucore/TIASurface.cxx
@@ -28,9 +28,18 @@
 namespace {
   FrameBuffer::ScalingInterpolation interpolationModeFromSettings(const Settings& settings)
   {
+#ifdef RETRON77
+  // Witv TV / and or scanline interpolation, the image has a height of ~480px. THe R77 runs at 720p, so there
+  // is no benefit from QIS in y-direction. In addition, QIS on the R77 has performance issues if TV effects are
+  // enabled.
+  return settings.getBool("tia.inter") || settings.getInt("tv.filter") != 0 || settings.getInt("tv.scanlines") != 0
+    ? FrameBuffer::ScalingInterpolation::blur
+    : FrameBuffer::ScalingInterpolation::sharp;
+#else
     return settings.getBool("tia.inter") ?
       FrameBuffer::ScalingInterpolation::blur :
       FrameBuffer::ScalingInterpolation::sharp;
+#endif
   }
 }