diff --git a/gargoylesquest.gb b/gargoylesquest.gb
new file mode 100644
index 0000000..9616f7e
Binary files /dev/null and b/gargoylesquest.gb differ
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..17d80f5
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,9 @@
+#include "sm83.h"
+#include "mem.h"
+
+int main(int argc, char *argv[])
+{
+    mem::init(nullptr, 0);
+    
+    return 0;
+}
\ No newline at end of file
diff --git a/mem.cpp b/mem.cpp
index a45c48f..1096581 100644
--- a/mem.cpp
+++ b/mem.cpp
@@ -3,20 +3,37 @@
 
 namespace mem
 {
+    uint8_t(*readMem)(uint16_t);
+    void (*writeMem)(uint16_t, uint8_t);
+
     char *title = nullptr;
-    uint8_t *memory = nullptr;
+    /*uint8_t *memory = nullptr;
     uint8_t *mapper_type = nullptr;
     uint8_t *rom_size = nullptr;
-    uint8_t *ram_size = nullptr;
+    uint8_t *ram_size = nullptr;*/
+
+    uint8_t r(uint16_t address)
+    {
+        return 0;
+    }
+
+    void w(uint16_t address, uint8_t value)
+    {
+
+    }
 
     void init(const uint8_t* rom, const int size)
     {
-        if (memory) free(memory);
-        memory = (uint8_t*)malloc(size);
-        title = (char*)&memory[0x134];
-        mapper_type = &memory[0x147];
-        rom_size = &memory[0x148];
-        ram_size = &memory[0x149];
+        //if (memory) free(memory);
+        //memory = (uint8_t*)malloc(size);
+        title = (char*)&rom[0x134];
+        uint8_t mapper_type = rom[0x147];
+        uint32_t rom_size = 32768 * (1 << rom[0x148]);
+        int sizes[] = { 0, 0, 8, 32, 128, 64};
+        uint32_t ram_size = sizes[rom[0x149]] * 1024;
+
+        readMem = r;
+        writeMem = w;
     }
 
     void reset()
@@ -24,14 +41,4 @@ namespace mem
 
     }
 
-    uint8_t readMem(uint16_t address)
-    {
-
-    }
-
-    void writeMem(uint16_t address, uint8_t value)
-    {
-
-    }
-
 }
diff --git a/mem.h b/mem.h
index afc2000..06553a0 100644
--- a/mem.h
+++ b/mem.h
@@ -3,10 +3,16 @@
 
 namespace mem
 {
-    #define MAPPER_NONE     0
+    #define MBC_NONE     0
+    #define MBC1         1
+    #define MBC2         2
+    #define MBC3         3
+    #define MBC5         5
+    #define MBC6         6
+    #define MBC7         7
     
     void init(const uint8_t* rom, const int size);
     void reset();
-    uint8_t readMem(uint16_t address);
-    void writeMem(uint16_t address, uint8_t value);
+    extern uint8_t(*readMem)(uint16_t);
+    extern void (*writeMem)(uint16_t, uint8_t);
 }
diff --git a/pokemonred.gb b/pokemonred.gb
new file mode 100644
index 0000000..c602e6c
Binary files /dev/null and b/pokemonred.gb differ
diff --git a/sm83.cpp b/sm83.cpp
index 57d8fbc..8cfcf5b 100644
--- a/sm83.cpp
+++ b/sm83.cpp
@@ -473,6 +473,8 @@ namespace sm83
         }
     }
 
+    void DI();
+
     void processInterrupts()
     {
         const uint8_t IF = mem::readMem(0xff0f);
@@ -679,6 +681,14 @@ namespace sm83
         //if (options[Z80_OPTION_STOP_ON_INVALID]) z80debug::stop();
     }
 
+    bool opcode_ignored = false;
+    void IgnoreOpcode()
+    {
+        t-=3;
+        rPC--;
+        opcode_ignored=true;
+    }
+
     void reset()
     {  
         mem::reset();
@@ -700,7 +710,6 @@ namespace sm83
 
     void BIT_INSTRUCTIONS();
 
-    bool opcode_ignored = false;
     uint32_t step()
     {
         do {
@@ -1285,13 +1294,6 @@ namespace sm83
         }
     }
 
-    void IgnoreOpcode()
-    {
-        t-=3;
-        rPC--;
-        opcode_ignored=true;
-    }
-
     //uint8_t *getMem() { return memory; }
     uint8_t *getRegs() { return regs; }
 
diff --git a/supermarioland.gb b/supermarioland.gb
new file mode 100644
index 0000000..4b7dca3
Binary files /dev/null and b/supermarioland.gb differ