diff --git a/source/quickerNES/core/emu.hpp b/source/quickerNES/core/emu.hpp
index eb79718..c248cbc 100644
--- a/source/quickerNES/core/emu.hpp
+++ b/source/quickerNES/core/emu.hpp
@@ -191,12 +191,12 @@ class Emu
   // Access to emulated memory, for viewer/cheater/debugger
 
   // CHR
-  uint8_t const *chr_mem();
+  uint8_t *chr_mem() const;
   long chr_size() const;
   void write_chr(void const *, long count, long offset);
 
   // Nametable
-  uint8_t *nametable_mem() { return emu.ppu.impl->nt_ram; }
+  uint8_t *nametable_mem() const { return emu.ppu.impl->nt_ram; }
   long nametable_size() const { return 0x1000; }
 
   // Built-in 2K memory
@@ -213,11 +213,12 @@ class Emu
   {
     high_mem_size = 0x2000
   };
-  uint8_t *high_mem() { return emu.impl->sram; }
+  uint8_t *high_mem() const { return emu.impl->sram; }
+  size_t get_high_mem_size() const { return high_mem_size; }
 
   // Sprite memory
-  uint8_t *spr_mem() { return emu.ppu.getSpriteRAM(); }
-  uint16_t spr_mem_size() { return emu.ppu.getSpriteRAMSize(); }
+  uint8_t *spr_mem() const { return emu.ppu.getSpriteRAM(); }
+  uint16_t spr_mem_size() const { return emu.ppu.getSpriteRAMSize(); }
 
   // End of public interface
   public:
@@ -277,7 +278,7 @@ inline void Emu::set_pixels(void *p, long n)
   emu.ppu.host_row_bytes = n;
 }
 
-inline uint8_t const *Emu::chr_mem()
+inline uint8_t *Emu::chr_mem() const
 {
   return cart()->chr_size() ? (uint8_t *)cart()->chr() : emu.ppu.impl->chr_ram;
 }
diff --git a/source/quickerNES/core/ppu/ppuImpl.hpp b/source/quickerNES/core/ppu/ppuImpl.hpp
index 0b8bb82..ef555a9 100644
--- a/source/quickerNES/core/ppu/ppuImpl.hpp
+++ b/source/quickerNES/core/ppu/ppuImpl.hpp
@@ -91,8 +91,8 @@ class Ppu_Impl : public ppu_state_t
 
   static const uint16_t scanline_len = 341;
 
-  uint8_t *getSpriteRAM() { return spr_ram; }
-  uint16_t getSpriteRAMSize() { return spr_ram_size; }
+  uint8_t *getSpriteRAM() const { return (uint8_t*)spr_ram; }
+  uint16_t getSpriteRAMSize() const { return spr_ram_size; }
   uint8_t spr_ram[spr_ram_size];
   void all_tiles_modified();
 
diff --git a/source/quickerNES/nesInstance.hpp b/source/quickerNES/nesInstance.hpp
index 4b1e618..0b316a6 100644
--- a/source/quickerNES/nesInstance.hpp
+++ b/source/quickerNES/nesInstance.hpp
@@ -12,6 +12,18 @@ class NESInstance final : public NESInstanceBase
   uint8_t *getLowMem() const override { return _nes.get_low_mem(); };
   size_t getLowMemSize() const override { return _nes.get_low_mem_size(); };
 
+  uint8_t *getWorkMem() const { return _nes.high_mem(); };
+  size_t getWorkMemSize() const { return _nes.get_high_mem_size(); };
+
+  uint8_t *getNametableMem() const { return _nes.nametable_mem(); };
+  size_t getNametableMemSize() const { return _nes.nametable_size(); };
+
+  uint8_t *getSpriteMem() const { return _nes.spr_mem(); };
+  size_t getSpriteMemSize() const { return _nes.spr_mem_size(); };
+
+  uint8_t *getCHRMem() const { return _nes.chr_mem(); };
+  size_t getCHRMemSize() const { return _nes.chr_size(); };
+
   void serializeState(uint8_t *state) const override {  _nes.serializeState(state); }
   void deserializeState(const uint8_t *state) override { _nes.deserializeState(state); }
   size_t getStateSize() const override { return _nes.getStateSize(); }