diff --git a/src/main.cpp b/src/main.cpp
index 0954b45..cdcbf0c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -26,7 +26,7 @@ uint16_t emulator_tick(Bus* bus) {
 }
 
 int main() {
-    const std::string rom_path = "roms/SMB2.nes";
+    const std::string rom_path = "roms/METROID.nes";
     const std::string palette_path = "ntscpalette.pal";
 
     Controller* const controller_1 = new Controller();
diff --git a/src/mapper_n_cart.cpp b/src/mapper_n_cart.cpp
index efd3376..7632587 100644
--- a/src/mapper_n_cart.cpp
+++ b/src/mapper_n_cart.cpp
@@ -130,11 +130,11 @@ namespace roee_nes {
     }
 
     uint8_t Save_RAM::mapper_read(const uint16_t addr) {
-        return save_data[addr % 0x6000];
+        return save_data[addr % 0x2000];
     }
 
     void Save_RAM::mapper_write(const uint16_t addr, const uint8_t data) {
-        save_data[addr % 0x6000] = data;
+        save_data[addr % 0x2000] = data;
     }
 
 
diff --git a/src/mappers/mmc1_1.cpp b/src/mappers/mmc1_1.cpp
index 0343f07..6f4d159 100644
--- a/src/mappers/mmc1_1.cpp
+++ b/src/mappers/mmc1_1.cpp
@@ -28,6 +28,8 @@ namespace roee_nes {
 
         if (cart->header.flag_6.parsed.prg_ram == 1)
             save_ram = new Save_RAM(cart->rom_path + ".sav");
+        else
+            save_ram = nullptr;
     }
 
     void MMC1_1::cpu_write(uint16_t addr, uint8_t data) {
@@ -152,6 +154,7 @@ namespace roee_nes {
     }
 
     void MMC1_1::save() {
-        save_ram->~Save_RAM();
+        if (save_ram != nullptr)
+            save_ram->~Save_RAM();
     }
 }
\ No newline at end of file
diff --git a/src/mappers/mmc3_4.cpp b/src/mappers/mmc3_4.cpp
index cb98c1d..a077e20 100644
--- a/src/mappers/mmc3_4.cpp
+++ b/src/mappers/mmc3_4.cpp
@@ -21,7 +21,11 @@ namespace roee_nes {
         chr_bank_num = (chr_read_mem->size() / (1 * KILOBYTE)) - 2;
         prg_bank_num = (cart->prg_rom.size() / (8 * KILOBYTE));
 
-        save_ram = new Save_RAM(cart->rom_path + ".sav");
+        if (cart->header.flag_6.parsed.prg_ram == 1)
+            save_ram = new Save_RAM(cart->rom_path + ".sav");
+        else
+            save_ram = nullptr;
+
         prg_bank[0] = 0;
         prg_bank[1] = 0;
         chr_bank[0] = 0;
@@ -211,6 +215,7 @@ namespace roee_nes {
     }
 
     void MMC3_4::save() {
-        save_ram->~Save_RAM();
+        if (save_ram != nullptr)
+            save_ram->~Save_RAM();
     }
 }
\ No newline at end of file