diff --git a/src/emucore/CartBUS.cxx b/src/emucore/CartBUS.cxx
index 1cda69022..1facde3de 100644
--- a/src/emucore/CartBUS.cxx
+++ b/src/emucore/CartBUS.cxx
@@ -660,16 +660,6 @@ uInt32 CartridgeBUS::getDatastreamIncrement(uInt8 index) const
         (myBUSRAM[DSxINC + index*4 + 3] << 24) ;   // high byte
 }
 
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void CartridgeBUS::setDatastreamIncrement(uInt8 index, uInt32 value)
-{
-//  index &= 0x0f;
-  myBUSRAM[DSxINC + index*4 + 0] = value & 0xff;          // low byte
-  myBUSRAM[DSxINC + index*4 + 1] = (value >> 8) & 0xff;
-  myBUSRAM[DSxINC + index*4 + 2] = (value >> 16) & 0xff;
-  myBUSRAM[DSxINC + index*4 + 3] = (value >> 24) & 0xff;  // high byte
-}
-
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 uInt32 CartridgeBUS::getAddressMap(uInt8 index) const
 {
diff --git a/src/emucore/CartCDF.cxx b/src/emucore/CartCDF.cxx
index 23ed2d577..308448c9a 100644
--- a/src/emucore/CartCDF.cxx
+++ b/src/emucore/CartCDF.cxx
@@ -597,17 +597,6 @@ uInt32 CartridgeCDF::getDatastreamIncrement(uInt8 index) const
         (myCDFRAM[address + 3] << 24) ;   // high byte
 }
 
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-void CartridgeCDF::setDatastreamIncrement(uInt8 index, uInt32 value)
-{
-  uInt16 address = DSxINC[myVersion] + index * 4;
-
-  myCDFRAM[address + 0] = value & 0xff;          // low byte
-  myCDFRAM[address + 1] = (value >> 8) & 0xff;
-  myCDFRAM[address + 2] = (value >> 16) & 0xff;
-  myCDFRAM[address + 3] = (value >> 24) & 0xff;  // high byte
-}
-
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 uInt32 CartridgeCDF::getWaveform(uInt8 index) const
 {