diff --git a/src/emu.cpp b/src/emu.cpp
new file mode 100644
index 0000000..610b192
--- /dev/null
+++ b/src/emu.cpp
@@ -0,0 +1,19 @@
+#include "emu.h"
+
+void Emu::update() {
+	for (auto unit : m_processing_units) {
+		if (m_cycle % int(m_frequency / unit.frequency()) == 0) {
+			unit.update();
+		}
+	}
+}
+
+void Emu::addProcessingUnit(ProcessingUnit processing_unit) {
+	m_processing_units.push_back(processing_unit);
+}
+
+void Emu::addMemorySpace(const char* name, int size) {
+	std::vector<uint8_t> memory;
+	memory.reserve(size);
+	m_memory_spaces.emplace(name, memory);
+}
\ No newline at end of file
diff --git a/src/emu.h b/src/emu.h
index 799c5a5..b20b0c8 100644
--- a/src/emu.h
+++ b/src/emu.h
@@ -2,6 +2,7 @@
 
 #include <cstdint>
 #include <vector>
+#include <unordered_map>
 
 #include "processing-unit.h"
 #include "ruc/singleton.h"
@@ -10,21 +11,23 @@ class Emu final : public ruc::Singleton<Emu> {
 public:
 	Emu(s) {}
 
-	void WriteRAM(int location, int length);
-	void WriteVRAM(int location, int length);
-	void WriteROM(int location, int length);
+	void update();
 
-	void ReadRAM(int location, int length);
-	void ReadVRAM(int location, int length);
-	void ReadROM(int location, int length);
+	void addProcessingUnit(ProcessingUnit processing_unit);
+	void addMemorySpace(const char* name, int size);
+
+	void writeRAM(const char* memory_space, int location);
+	void writeVRAM(const char* memory_space, int location);
+	void writeROM(const char* memory_space, int location);
+
+	uint8_t readRAM(const char* memory_space, int location);
+	uint8_t readVRAM(const char* memory_space, int location);
+	uint8_t readROM(const char* memory_space, int location);
 
 private:
 	float m_frequency;
 	int m_cycle = 0;
 
-	uint8_t m_ram[1024];
-	uint8_t m_vram[1024];
-	uint8_t m_rom[1024];
-
 	std::vector<ProcessingUnit> m_processing_units;
+	std::unordered_map<const char*, std::vector<uint8_t>> m_memory_spaces;
 };
diff --git a/src/processing-unit.cpp b/src/processing-unit.cpp
index 851c7b8..4026a82 100644
--- a/src/processing-unit.cpp
+++ b/src/processing-unit.cpp
@@ -5,12 +5,16 @@
  * SPDX-License-Identifier: MIT
  */
 
-#include "processingunit.h"
+#include "processing-unit.h"
 
-ProcessingUnit::ProcessingUnit()
+ProcessingUnit::ProcessingUnit(float frequency) : m_frequency(frequency)
 {
 }
 
 ProcessingUnit::~ProcessingUnit()
 {
 }
+
+float ProcessingUnit::frequency() {
+	return m_frequency;
+}
\ No newline at end of file
diff --git a/src/processing-unit.h b/src/processing-unit.h
index d43d5dd..97d6c11 100644
--- a/src/processing-unit.h
+++ b/src/processing-unit.h
@@ -9,6 +9,13 @@
 
 class ProcessingUnit {
 public:
-	ProcessingUnit();
+	ProcessingUnit(float frequency);
 	virtual ~ProcessingUnit();
+
+	virtual void update();
+
+	float frequency();
+
+private:
+float m_frequency;
 };