diff --git a/Core/BaseCartridge.cpp b/Core/BaseCartridge.cpp
index becf15b..508001c 100644
--- a/Core/BaseCartridge.cpp
+++ b/Core/BaseCartridge.cpp
@@ -57,7 +57,7 @@ shared_ptr<BaseCartridge> BaseCartridge::CreateCartridge(Console* console, Virtu
 		cart->_romPath = romFile;
 
 		if(FolderUtilities::GetExtension(romFile.GetFileName()) == ".bs") {
-			cart->_bsxMemPack.reset(new BsxMemoryPack(romData));
+			cart->_bsxMemPack.reset(new BsxMemoryPack(console, romData, false));
 			if(!FirmwareHelper::LoadBsxFirmware(console, &cart->_prgRom, cart->_prgRomSize)) {
 				return nullptr;
 			}
@@ -329,6 +329,10 @@ void BaseCartridge::SaveBattery()
 	if(_coprocessor && _hasBattery) {
 		_coprocessor->SaveBattery();
 	}
+
+	if(_bsxMemPack) {
+		_bsxMemPack->SaveBattery();
+	}
 }
 
 void BaseCartridge::Init(MemoryMappings &mm)
@@ -363,6 +367,7 @@ void BaseCartridge::Init(MemoryMappings &mm)
 void BaseCartridge::RegisterHandlers(MemoryMappings &mm)
 {
 	if(MapSpecificCarts(mm) || _coprocessorType == CoprocessorType::GSU || _coprocessorType == CoprocessorType::SDD1 || _coprocessorType == CoprocessorType::SPC7110 || _coprocessorType == CoprocessorType::CX4) {
+		MapBsxMemoryPack(mm);
 		return;
 	}
 
@@ -403,6 +408,8 @@ void BaseCartridge::RegisterHandlers(MemoryMappings &mm)
 		mm.RegisterHandler(0x70, 0x7D, 0x0000, 0x7FFF, _saveRamHandlers);
 		mm.RegisterHandler(0xA0, 0xBF, 0x6000, 0x7FFF, _saveRamHandlers);
 	}
+
+	MapBsxMemoryPack(mm);
 }
 
 void BaseCartridge::LoadEmbeddedFirmware()
@@ -444,7 +451,7 @@ void BaseCartridge::InitCoprocessor()
 		if(!_bsxMemPack) {
 			//Create an empty memory pack if the BIOS was loaded directly (instead of a .bs file)
 			vector<uint8_t> emptyMemPack;
-			_bsxMemPack.reset(new BsxMemoryPack(emptyMemPack));
+			_bsxMemPack.reset(new BsxMemoryPack(_console, emptyMemPack, false));
 		}
 
 		_coprocessor.reset(new BsxCart(_console, _bsxMemPack.get()));
@@ -489,6 +496,32 @@ bool BaseCartridge::MapSpecificCarts(MemoryMappings &mm)
 	return false;
 }
 
+void BaseCartridge::MapBsxMemoryPack(MemoryMappings& mm)
+{
+	string code = GetGameCode();
+	if(!_bsxMemPack && code.size() == 4 && code[0] == 'Z' && _cartInfo.DeveloperId == 0x33) {
+		//Game with data pack slot (e.g Sound Novel Tsukuuru, etc.)
+		vector<uint8_t> saveData = _console->GetBatteryManager()->LoadBattery(".bs");
+		if(saveData.empty()) {
+			//Make a 1 megabyte flash cartridge by default (use $FF for all bytes)
+			saveData.resize(0x100000, 0xFF);
+		}
+		_bsxMemPack.reset(new BsxMemoryPack(_console, saveData, true));
+
+		if(_flags & CartFlags::LoRom) {
+			mm.RegisterHandler(0xC0, 0xEF, 0x0000, 0x7FFF, _bsxMemPack->GetMemoryHandlers());
+			mm.RegisterHandler(0xC0, 0xEF, 0x8000, 0xFFFF, _bsxMemPack->GetMemoryHandlers());
+		} else {
+			mm.RegisterHandler(0x20, 0x3F, 0x8000, 0xFFFF, _bsxMemPack->GetMemoryHandlers(), 8);
+			mm.RegisterHandler(0x60, 0x7D, 0x0000, 0xFFFF, _bsxMemPack->GetMemoryHandlers());
+			mm.RegisterHandler(0xA0, 0xBF, 0x8000, 0xFFFF, _bsxMemPack->GetMemoryHandlers(), 8);
+			mm.RegisterHandler(0xE0, 0xFF, 0x0000, 0xFFFF, _bsxMemPack->GetMemoryHandlers());
+		}
+
+		//TODO: SA-1 cartridges, etc.
+	}
+}
+
 void BaseCartridge::ApplyConfigOverrides()
 {
 	string name = GetCartName();
@@ -539,16 +572,16 @@ void BaseCartridge::Serialize(Serializer &s)
 string BaseCartridge::GetGameCode()
 {
 	string code;
-	if(_cartInfo.GameCode[0] >= ' ') {
+	if(_cartInfo.GameCode[0] > ' ') {
 		code += _cartInfo.GameCode[0];
 	}
-	if(_cartInfo.GameCode[1] >= ' ') {
+	if(_cartInfo.GameCode[1] > ' ') {
 		code += _cartInfo.GameCode[1];
 	}
-	if(_cartInfo.GameCode[2] >= ' ') {
+	if(_cartInfo.GameCode[2] > ' ') {
 		code += _cartInfo.GameCode[2];
 	}
-	if(_cartInfo.GameCode[3] >= ' ') {
+	if(_cartInfo.GameCode[3] > ' ') {
 		code += _cartInfo.GameCode[3];
 	}
 	return code;
diff --git a/Core/BaseCartridge.h b/Core/BaseCartridge.h
index eaa1dce..938bdf9 100644
--- a/Core/BaseCartridge.h
+++ b/Core/BaseCartridge.h
@@ -62,7 +62,8 @@ private:
 	CoprocessorType GetSt01xVersion();
 	CoprocessorType GetDspVersion();
 
-	bool MapSpecificCarts(MemoryMappings &mm);
+	bool MapSpecificCarts(MemoryMappings& mm);
+	void MapBsxMemoryPack(MemoryMappings& mm);
 	void ApplyConfigOverrides();
 	
 	void LoadRom();
diff --git a/Core/BsxMemoryPack.cpp b/Core/BsxMemoryPack.cpp
index f7728de..30e219f 100644
--- a/Core/BsxMemoryPack.cpp
+++ b/Core/BsxMemoryPack.cpp
@@ -1,12 +1,16 @@
 #include "stdafx.h"
 #include "BsxMemoryPack.h"
+#include "Console.h"
+#include "BatteryManager.h"
 #include "../Utilities/IpsPatcher.h"
 
-BsxMemoryPack::BsxMemoryPack(vector<uint8_t>& data)
+BsxMemoryPack::BsxMemoryPack(Console* console, vector<uint8_t>& data, bool persistFlash)
 {
+	_console = console;
 	_orgData = data;
 	_dataSize = (uint32_t)data.size();
 	_data = new uint8_t[_dataSize];
+	_persistFlash = persistFlash;
 	memcpy(_data, data.data(), _dataSize);
 
 	_calculatedSize = std::min<uint8_t>(0x0C, (uint8_t)log2(_dataSize >> 10));
@@ -21,6 +25,13 @@ BsxMemoryPack::~BsxMemoryPack()
 	delete[] _data;
 }
 
+void BsxMemoryPack::SaveBattery()
+{
+	if(_persistFlash) {
+		_console->GetBatteryManager()->SaveBattery(".bs", _data, _dataSize);
+	}
+}
+
 void BsxMemoryPack::Serialize(Serializer& s)
 {
 	s.Stream(_enableCsr, _enableEsr, _enableVendorInfo, _writeByte, _command);
@@ -105,12 +116,10 @@ BsxMemoryPack::BsxMemoryPackHandler::BsxMemoryPackHandler(BsxMemoryPack* memPack
 
 uint8_t BsxMemoryPack::BsxMemoryPackHandler::Read(uint32_t addr)
 {
-	if(addr >= 0xC00000) {
-		if(_memPack->_enableEsr) {
-			switch(addr & 0xFFFF) {
-				case 0x0002: return 0xC0;
-				case 0x0004: return 0x82;
-			}
+	if(_offset == 0 && _memPack->_enableEsr) {
+		switch(addr & 0xFFF) {
+			case 0x0002: return 0xC0;
+			case 0x0004: return 0x82;
 		}
 	}
 
@@ -143,7 +152,7 @@ void BsxMemoryPack::BsxMemoryPackHandler::Write(uint32_t addr, uint8_t value)
 		uint8_t currentByte = RamHandler::Read(addr);
 		RamHandler::Write(addr, value & currentByte);
 		_memPack->_writeByte = false;
-	} else if(addr == 0xC00000) {
+	} else if(_offset == 0 && (addr & 0xFFF) == 0) {
 		_memPack->ProcessCommand(value, _page);
 	}
 }
diff --git a/Core/BsxMemoryPack.h b/Core/BsxMemoryPack.h
index c5c4629..f49ccfc 100644
--- a/Core/BsxMemoryPack.h
+++ b/Core/BsxMemoryPack.h
@@ -5,9 +5,12 @@
 #include "../Utilities/ISerializable.h"
 
 class BsxMemoryPackHandler;
+class Console;
 
 class BsxMemoryPack : public ISerializable
 {
+private:
+	Console* _console = nullptr;
 	vector<uint8_t> _orgData;
 	uint8_t* _data = nullptr;
 	uint32_t _dataSize = 0;
@@ -15,6 +18,7 @@ class BsxMemoryPack : public ISerializable
 
 	uint8_t _calculatedSize = 0x0C;
 
+	bool _persistFlash = false;
 	bool _enableCsr = false;
 	bool _enableEsr = false;
 	bool _enableVendorInfo = false;
@@ -22,9 +26,11 @@ class BsxMemoryPack : public ISerializable
 	uint16_t _command = 0;
 
 public:
-	BsxMemoryPack(vector<uint8_t>& data);
+	BsxMemoryPack(Console* console, vector<uint8_t>& data, bool persistFlash);
 	virtual ~BsxMemoryPack();
 
+	void SaveBattery();
+
 	void Serialize(Serializer& s) override;
 
 	void ProcessCommand(uint8_t value, uint32_t page);
diff --git a/Core/CartTypes.h b/Core/CartTypes.h
index 4c32875..71bf090 100644
--- a/Core/CartTypes.h
+++ b/Core/CartTypes.h
@@ -18,7 +18,7 @@ struct SnesCartInformation
 	uint8_t SramSize;
 
 	uint8_t DestinationCode;
-	uint8_t Reserved2;
+	uint8_t DeveloperId;
 	uint8_t Version;
 
 	uint8_t ChecksumComplement[2];
diff --git a/Core/RamHandler.h b/Core/RamHandler.h
index e798526..1476f57 100644
--- a/Core/RamHandler.h
+++ b/Core/RamHandler.h
@@ -7,9 +7,11 @@ class RamHandler : public IMemoryHandler
 {
 private:
 	uint8_t * _ram;
-	uint32_t _offset;
 	uint32_t _mask;
 
+protected:
+	uint32_t _offset;
+
 public:
 	RamHandler(uint8_t *ram, uint32_t offset, uint32_t size, SnesMemoryType memoryType)
 	{