diff --git a/src/cpu.cpp b/src/cpu.cpp
index f511501..f626793 100644
--- a/src/cpu.cpp
+++ b/src/cpu.cpp
@@ -23,7 +23,6 @@ CPU::CPU(uint32_t frequency)
 	, m_e(0x56)
 	, m_h(0x0)
 	, m_l(0x0d)
-	// , m_pc(0x100)
 	, m_pc(0x0)
 	, m_sp(0xfffe)
 	// Flags
@@ -65,7 +64,8 @@ void CPU::update()
 	m_wait_cycles--;
 	if (m_wait_cycles <= 0) {
 		// Read next opcode
-		uint8_t opcode = peekBootrom();
+		uint8_t opcode = peekMemory();
+		VERIFY(m_opcode_lookup_table.find(opcode) != m_opcode_lookup_table.end(), "opcode {:#x} not implemented", opcode);
 		m_opcode_lookup_table[opcode]();
 	}
 
@@ -74,8 +74,8 @@ void CPU::update()
 
 void CPU::add()
 {
-	uint8_t opcode = consumeBootrom();
-	uint8_t immediate = consumeBootrom();
+	uint8_t opcode = consumeMemory();
+	uint8_t immediate = consumeMemory();
 	switch (opcode) {
 	case 0xc6: // ADD A,d8
 		// Program counter +2
@@ -103,7 +103,7 @@ void CPU::add()
 
 void CPU::ld16()
 {
-	uint8_t opcode = consumeBootrom();
+	uint8_t opcode = consumeMemory();
 	switch (opcode) {
 	case 0x01: {
 		m_wait_cycles += 12;
@@ -130,14 +130,14 @@ void CPU::ld16()
 
 // -----------------------------------------
 
-uint8_t CPU::peekBootrom(int32_t offset) const
+uint8_t CPU::peekMemory(int32_t offset) const
 {
-	return Emu::the().bootrom()[m_pc + offset];
+	return Emu::the().readMemory(m_pc + offset);
 }
 
-uint8_t CPU::consumeBootrom()
+uint8_t CPU::consumeMemory()
 {
-	return Emu::the().bootrom()[m_pc++];
+	return Emu::the().readMemory(m_pc++);
 }
 
 void CPU::setBc(uint32_t value)
diff --git a/src/cpu.h b/src/cpu.h
index b5a5a45..c10bde5 100644
--- a/src/cpu.h
+++ b/src/cpu.h
@@ -52,10 +52,10 @@ public:
 	// Miscellaneous Instructions
 
 private:
-	uint8_t peekBootrom(int32_t offset = 0) const;
-	uint8_t consumeBootrom();
+	uint8_t peekMemory(int32_t offset = 0) const;
+	uint8_t consumeMemory();
 
-	uint32_t immediate16() { return (consumeBootrom() << 8) | consumeBootrom(); }
+	uint32_t immediate16() { return (consumeMemory() << 8) | consumeMemory(); }
 
 	void setBc(uint32_t value);
 	void setDe(uint32_t value);
diff --git a/src/emu.cpp b/src/emu.cpp
index eb6d614..f32f475 100644
--- a/src/emu.cpp
+++ b/src/emu.cpp
@@ -10,15 +10,13 @@
 
 #include "cpu.h"
 #include "emu.h"
-#include "ruc/file.h"
 #include "ruc/format/print.h"
 #include "ruc/meta/assert.h"
 
-void Emu::init(uint32_t frequency, std::string_view bootrom)
+void Emu::init(uint32_t frequency)
 {
 	m_frequency = frequency;
 	m_timestep = 1.0 / m_frequency * 1000000;
-	m_bootrom = ruc::File(bootrom.data()).data();
 }
 
 void Emu::update()
diff --git a/src/emu.h b/src/emu.h
index b6dab9d..5a5f5d4 100644
--- a/src/emu.h
+++ b/src/emu.h
@@ -30,7 +30,7 @@ class Emu final : public ruc::Singleton<Emu> {
 public:
 	Emu(s) {}
 
-	void init(uint32_t frequency, std::string_view bootrom);
+	void init(uint32_t frequency);
 
 	void update();
 
@@ -44,8 +44,6 @@ public:
 
 	ProcessingUnit* processingUnit(std::string_view name) const { return m_processing_units.at(name); }
 
-	std::string_view bootrom() const { return m_bootrom; }
-
 private:
 	uint32_t m_frequency { 0 };
 	double m_timestep { 0 };
@@ -57,6 +55,4 @@ private:
 
 	std::unordered_map<std::string_view, ProcessingUnit*> m_processing_units;
 	std::unordered_map<std::string_view, MemorySpace> m_memory_spaces;
-
-	std::string m_bootrom;
 };
diff --git a/src/main.cpp b/src/main.cpp
index f381970..36bc351 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -20,7 +20,7 @@ int main(int argc, char* argv[])
 
 	print("{}ms\n", t.elapsedNanoseconds() / 1000000.0);
 
-	Emu::the().init(8000000, "gbc_bios.bin");
+	Emu::the().init(8000000);
 
 	CPU cpu(8000000);
 	PPU ppu(4000000);
@@ -36,9 +36,9 @@ int main(int argc, char* argv[])
 	Emu::the().addMemorySpace("CARDRAM", 0xa000, 0xbfff);    // 8KiB
 	Emu::the().addMemorySpace("WRAM1", 0xc000, 0xcfff, 1);   // 4 KiB, Work RAM
 	Emu::the().addMemorySpace("WRAM2", 0xd000, 0xdfff, 7);   // 4 KiB * 7 banks, Work RAM
-	Emu::the().addMemorySpace("ECHORAM", 0xe000, 0xfdff, 1); // 7679B, Mirror of 0xc000~0xddff
-	Emu::the().addMemorySpace("OAM", 0xfe00, 0xfe9f, 1);     // 4KiB, Object Attribute Memory (VRAM Sprite Attribute Table)
-	Emu::the().addMemorySpace("HRAM", 0xff80, 0xfffe, 1);    // 126B, High RAM (CPU cache)
+	Emu::the().addMemorySpace("ECHORAM", 0xe000, 0xfdff, 1); // 7680B, Mirror of 0xc000~0xddff
+	Emu::the().addMemorySpace("OAM", 0xfe00, 0xfe9f, 1);     // 160B, Object Attribute Memory (VRAM Sprite Attribute Table)
+	Emu::the().addMemorySpace("HRAM", 0xff80, 0xfffe, 1);    // 127B, High RAM (CPU cache)
 
 	// Get shared register
 	print("{}\n", *Emu::the().processingUnit("cpu")->sharedRegister("a"));