diff --git a/src/emucore/CartELF.cxx b/src/emucore/CartELF.cxx
index e298f045b..9c111b783 100644
--- a/src/emucore/CartELF.cxx
+++ b/src/emucore/CartELF.cxx
@@ -325,6 +325,13 @@ CortexM0::err_t CartridgeELF::BusFallbackDelegate::fetch16(
     : CortexM0::errIntrinsic(CortexM0::ERR_UNMAPPED_FETCH16, address);
 }
 
+CortexM0::err_t CartridgeELF::BusFallbackDelegate::read8(uInt32 address, uInt8& value, CortexM0& cortex)
+{
+  // TODO: remove this hack and replace it with a setting.
+  value = 0;
+  return 0;
+}
+
 inline uInt64 CartridgeELF::getArmCycles() const
 {
   return myCortexEmu.getCycles() + myArmCyclesOffset;
diff --git a/src/emucore/CartELF.hxx b/src/emucore/CartELF.hxx
index 56eb7afc4..68529844f 100644
--- a/src/emucore/CartELF.hxx
+++ b/src/emucore/CartELF.hxx
@@ -68,6 +68,7 @@ class CartridgeELF: public Cartridge {
   private:
     class BusFallbackDelegate: public CortexM0::BusTransactionDelegate {
       CortexM0::err_t fetch16(uInt32 address, uInt16& value, uInt8& op, CortexM0& cortex);
+      CortexM0::err_t read8(uInt32 address, uInt8& value, CortexM0& cortex);
     };
 
     enum class ExecutionStage {
@@ -119,7 +120,7 @@ class CartridgeELF: public Cartridge {
     BusFallbackDelegate myFallbackDelegate;
 
     ConsoleTiming myConsoleTiming{ConsoleTiming::ntsc};
-    uInt32 myArmCyclesPer6502Cycle{80};
+    uInt32 myArmCyclesPer6502Cycle{140};
 
     Int64 myArmCyclesOffset{0};