diff --git a/source/logger.hpp b/source/logger.hpp
index 3c19646..1ad1098 100644
--- a/source/logger.hpp
+++ b/source/logger.hpp
@@ -5,14 +5,19 @@
 #include <stdio.h>
 
 // If we use NCurses, we need to use the appropriate printing function
-#ifdef NCURSES
-  #include <ncurses.h>
-  #define LOG printw
-#else
-  #define LOG printf
+#ifndef LOG
+  #ifdef NCURSES
+    #include <ncurses.h>
+    #define LOG printw
+  #else
+    #define LOG printf
+  #endif
+#endif
+
+#ifndef EXIT_WITH_ERROR
+ #define EXIT_WITH_ERROR(...) exitWithError(__FILE__, __LINE__, __VA_ARGS__)
 #endif
 
-#define EXIT_WITH_ERROR(...) exitWithError(__FILE__, __LINE__, __VA_ARGS__)
 inline void exitWithError [[noreturn]] (const char *fileName, const int lineNumber, const char *format, ...)
 {
   char *outstr = 0;
diff --git a/source/nesInstanceBase.hpp b/source/nesInstanceBase.hpp
index 5daad89..2f9a06f 100644
--- a/source/nesInstanceBase.hpp
+++ b/source/nesInstanceBase.hpp
@@ -3,10 +3,6 @@
 #include "logger.hpp"
 #include "controller.hpp"
 
-#define _LOW_MEM_SIZE 0x800
-#define _HIGH_MEM_SIZE 0x2000
-#define _NAMETABLES_MEM_SIZE 0x1000
-
 // Size of image generated in graphics buffer
 static const uint16_t image_width = 256;
 static const uint16_t image_height = 240;
@@ -95,7 +91,8 @@ class NESInstanceBase
 
   // Virtual functions
 
-  virtual uint8_t *getLowMem() = 0;
+  virtual uint8_t *getLowMem() const = 0;
+  virtual size_t getLowMemSize() const = 0;
 
   virtual void serializeState(uint8_t *state) const = 0;
   virtual void deserializeState(const uint8_t *state) = 0;
diff --git a/source/quickNES/core b/source/quickNES/core
index c41d8ef..e35054d 160000
--- a/source/quickNES/core
+++ b/source/quickNES/core
@@ -1 +1 @@
-Subproject commit c41d8eff29132553e374abc15108c552b6d4a942
+Subproject commit e35054dc19c94fcac9b8cfd2fbf5b33f8e1dfbde
diff --git a/source/quickNES/nesInstance.hpp b/source/quickNES/nesInstance.hpp
index 6a26d49..0c900e6 100644
--- a/source/quickNES/nesInstance.hpp
+++ b/source/quickNES/nesInstance.hpp
@@ -23,7 +23,8 @@ class NESInstance final : public NESInstanceBase
     register_mapper_70();
   }
 
-  uint8_t *getLowMem() override { return _nes.low_mem(); };
+  uint8_t *getLowMem() const override { return _nes.low_mem(); };
+  size_t getLowMemSize() const override { return 0x800; };
 
   void serializeState(uint8_t *state) const override
   {
diff --git a/source/quickerNES/core/emu.hpp b/source/quickerNES/core/emu.hpp
index 3ed140a..eb79718 100644
--- a/source/quickerNES/core/emu.hpp
+++ b/source/quickerNES/core/emu.hpp
@@ -204,7 +204,9 @@ class Emu
   {
     low_mem_size = 0x800
   };
-  uint8_t *low_mem() { return emu.low_mem; }
+  
+  uint8_t *get_low_mem() const { return (uint8_t*)emu.low_mem; }
+  size_t get_low_mem_size() const { return low_mem_size; }
 
   // Optional 8K memory
   enum
diff --git a/source/quickerNES/nesInstance.hpp b/source/quickerNES/nesInstance.hpp
index bfc72d4..4b1e618 100644
--- a/source/quickerNES/nesInstance.hpp
+++ b/source/quickerNES/nesInstance.hpp
@@ -9,7 +9,8 @@ class NESInstance final : public NESInstanceBase
 {
   public:
 
-  uint8_t *getLowMem() override { return _nes.low_mem(); };
+  uint8_t *getLowMem() const override { return _nes.get_low_mem(); };
+  size_t getLowMemSize() const override { return _nes.get_low_mem_size(); };
 
   void serializeState(uint8_t *state) const override {  _nes.serializeState(state); }
   void deserializeState(const uint8_t *state) override { _nes.deserializeState(state); }
diff --git a/source/utils.hpp b/source/utils.hpp
index c9f3319..97903ad 100644
--- a/source/utils.hpp
+++ b/source/utils.hpp
@@ -169,5 +169,5 @@ inline hash_t calculateMetroHash(uint8_t *data, size_t size)
 
 inline hash_t calculateStateHash(NESInstance* nes)
 {
-  return calculateMetroHash(nes->getLowMem(), _LOW_MEM_SIZE);
+  return calculateMetroHash(nes->getLowMem(), nes->getLowMemSize());
 }
\ No newline at end of file