diff --git a/CMakeLists.txt b/CMakeLists.txt
index 73d2f2f..8a988dd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,11 +8,20 @@ project(ComSquare)
 add_compile_options(-W -Wall -Wextra -Wshadow)
 
 # make unit tests
-add_executable(unit_tests sources/hello.cpp tests/hello.cpp)
+add_executable(unit_tests
+        tests/testCPU.cpp
+)
 
 # include criterion & coverage
 target_link_libraries(unit_tests criterion -lgcov)
 target_compile_options(unit_tests PUBLIC -fprofile-arcs -ftest-coverage)
 
 # make app
-add_executable(ComSquare main.cpp sources/hello.cpp sources/Memory/MemoryBus.cpp sources/Memory/MemoryBus.hpp sources/Memory/IMemory.hpp sources/Memory/IMemory.cpp)
+add_executable(ComSquare
+    main.cpp
+    sources/Memory/MemoryBus.cpp
+    sources/Memory/MemoryBus.hpp
+    sources/Memory/IMemory.hpp
+    sources/Memory/IMemory.cpp
+    sources/CPU/Cpu.cpp
+    sources/CPU/Cpu.hpp)
diff --git a/main.cpp b/main.cpp
index b92cc19..cffe016 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,6 +1,8 @@
-int HelloWorld(void);
+//
+// Created by anonymus-raccoon on 1/24/20.
+//
 
 int main(void)
 {
-    return HelloWorld();
+    return 0;
 }
\ No newline at end of file
diff --git a/sources/CPU/Cpu.cpp b/sources/CPU/Cpu.cpp
new file mode 100644
index 0000000..680b728
--- /dev/null
+++ b/sources/CPU/Cpu.cpp
@@ -0,0 +1,5 @@
+//
+// Created by anonymus-raccoon on 1/24/20.
+//
+
+#include "Cpu.hpp"
diff --git a/sources/CPU/Cpu.hpp b/sources/CPU/Cpu.hpp
new file mode 100644
index 0000000..ebcf8d7
--- /dev/null
+++ b/sources/CPU/Cpu.hpp
@@ -0,0 +1,100 @@
+//
+// Created by anonymus-raccoon on 1/24/20.
+//
+
+#ifndef COMSQUARE_CPU_HPP
+#define COMSQUARE_CPU_HPP
+
+#include "../Memory/IMemory.hpp"
+
+namespace ComSquare::CPU
+{
+	//! @brief Struct containing registers for the main CPU.
+	struct Registers {
+		//! @brief The Accumulator
+		union {
+			struct {
+				unsigned char al;
+				unsigned char ah;
+			};
+			unsigned short a;
+		};
+		//! @brief The Data Bank Register;
+		unsigned char dbr;
+		//! @brief The Direct register;
+		union {
+			struct {
+				unsigned char dl;
+				unsigned char dh;
+			};
+			unsigned short d;
+		};
+		//! @brief The program banK register;
+		unsigned char k;
+		//! @brief The Program Counter;
+		union {
+			struct {
+				unsigned char pcl;
+				unsigned char pch;
+			};
+			unsigned short pc;
+		};
+		//! @brief The Stack pointer
+		union {
+			struct {
+				unsigned char sl;
+				unsigned char sh;
+			};
+			unsigned short s;
+		};
+		//! @brief The X index register
+		union {
+			struct {
+				unsigned char xl;
+				unsigned char xh;
+			};
+			unsigned short x;
+		};
+		//! @brief The Y index register
+		union {
+			struct {
+				unsigned char yl;
+				unsigned char yh;
+			};
+			unsigned short y;
+		};
+
+		//!	@brief The Emulation mode flag
+		bool e;
+		//! @brief The Processor status register;
+		union p {
+			//!	@brief The Carry flag
+			bool c : 1;
+			//! @brief The Zero flag
+			bool z : 1;
+			//!	@brief The Interrupt disable flag
+			bool i : 1;
+			//!	@brief The Decimal mode flag
+			bool d : 1;
+			union {
+				//!	@brief The indeX register width flag (in native mode only)
+				bool x : 1;
+				//! @brief The Break flag (in emulation mode only)
+				bool b : 1;
+			};
+			//! @brief The accumulator and Memory width flag (in native mode only)
+			bool m : 1;
+			//! @brief The oVerflow flag
+			bool v : 1;
+			//!	@brief The Negative flag
+			bool n : 1;
+		};
+	};
+
+	class CPU : IMemory {
+	private:
+		Registers _registers;
+	};
+}
+
+#endif //COMSQUARE_CPU_HPP
diff --git a/sources/hello.cpp b/sources/hello.cpp
deleted file mode 100644
index b62ba07..0000000
--- a/sources/hello.cpp
+++ /dev/null
@@ -1,7 +0,0 @@
-#include <iostream>
-
-int HelloWorld(void)
-{
-    std::cout << "Hello, World!" << std::endl;
-    return 0;
-}
\ No newline at end of file
diff --git a/tests/hello.cpp b/tests/hello.cpp
deleted file mode 100644
index b8f8842..0000000
--- a/tests/hello.cpp
+++ /dev/null
@@ -1,10 +0,0 @@
-#include <criterion/criterion.h>
-
-int HelloWorld(void);
-
-Test(HelloWorld, hello)
-{
-    int result = HelloWorld();
-
-    cr_assert_eq(result, 0);
-}
\ No newline at end of file
diff --git a/tests/testCPU.cpp b/tests/testCPU.cpp
new file mode 100644
index 0000000..2ab4ec8
--- /dev/null
+++ b/tests/testCPU.cpp
@@ -0,0 +1,4 @@
+//
+// Created by anonymus-raccoon on 1/24/20.
+//
+