diff --git a/system/dmg.cpp b/system/dmg.cpp
new file mode 100644
index 0000000..2a50988
--- /dev/null
+++ b/system/dmg.cpp
@@ -0,0 +1,33 @@
+#include <system/dmg.h>
+
+System::System(Cartridge cart)
+  : cart(cart), mbc1(cart), wram1(0x1000), wram2(0x1000),
+    hram(0x100), oam(0x100), bus(), cpu(&bus),
+    ie_mapped(cpu.state.IE), if_mapped(cpu.state.IF)
+{
+  bus.map_device(0x0000, 0x7FFF, &mbc1);
+  bus.map_device(0xA000, 0xBFFF, &mbc1, 0xA000);
+  bus.map_device(0xC000, 0xCFFF, &wram1);
+  bus.map_device(0xD000, 0xDFFF, &wram2);
+  bus.map_device(0xE000, 0xFDFF, &wram1);
+  bus.map_device(0xFE00, 0xFE9F, &oam);
+  bus.map_device(0xFF80, 0xFFFE, &hram);
+  bus.map_device(0xFFFF, 0xFFFF, &ie_mapped);
+  bus.map_device(0xFF0F, 0xFF0F, &if_mapped);
+
+  cpu.state.A = 0x1;
+  cpu.state.carry = true;
+  cpu.state.halfcarry = true;
+  cpu.state.subtract = false;
+  cpu.state.zero = true;
+
+  cpu.state.B = 0x00;
+  cpu.state.C = 0x13;
+  cpu.state.D = 0x00;
+  cpu.state.E = 0xD8;
+  cpu.state.H = 0x01;
+  cpu.state.L = 0x4D;
+
+  cpu.state.SP = 0xFFFE;
+  cpu.state.PC = 0x100;
+}
diff --git a/system/dmg.h b/system/dmg.h
new file mode 100644
index 0000000..a5654bd
--- /dev/null
+++ b/system/dmg.h
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <cpu/cpu.h>
+#include <cartridge/cartridge.h>
+#include <cartridge/mbc/mbc1.h>
+#include <memory/ram.h>
+#include <memory/bus.h>
+#include <memory/register.h>
+
+class DMG
+{
+private:
+  RAM wram1;
+  RAM wram2;
+  RAM hram;
+  RAM oam;
+
+  MBC1 mbc;
+
+  Bus bus;
+  Cpu cpu;
+
+  BoundRegister ie_mapped;
+  BoundRegister if_mapped;
+
+public:
+  System(Cartridge cart);
+
+  void run();
+};