diff --git a/src/Color.cpp b/src/Color.cpp
new file mode 100644
index 0000000..3daac50
--- /dev/null
+++ b/src/Color.cpp
@@ -0,0 +1,8 @@
+
+#include "Color.h"
+
+Color::Color(unsigned char red, unsigned char green, unsigned char blue)
+    : red(red), green(green), blue(blue){
+
+}
+
diff --git a/src/Color.h b/src/Color.h
index 93172d7..3d75e99 100644
--- a/src/Color.h
+++ b/src/Color.h
@@ -1,8 +1,6 @@
 #ifndef LIBRARY_COLOR_H
 #define LIBRARY_COLOR_H
 
-static const Color black = Color(0, 0, 0);
-static const Color white = Color(255, 255, 255);
 
 /**
  * color values represented as rgb values.
@@ -17,9 +15,11 @@ private:
     unsigned char blue;
 
 public:
-    Color(red, green, blue);
+    Color(unsigned char red, unsigned char green, unsigned char blue);
 
 };
 
+const Color black = Color(0, 0, 0);
+const Color white = Color(255, 255, 255);
 
 #endif
diff --git a/src/KeyCode.cpp b/src/KeyCode.cpp
new file mode 100644
index 0000000..6e7e2c7
--- /dev/null
+++ b/src/KeyCode.cpp
@@ -0,0 +1,9 @@
+
+#include "KeyCode.h"
+
+KeyCode::KeyCode(int value) : value(value) {}
+
+int KeyCode::getValue() {
+    return value;
+}
+
diff --git a/src/KeyCode.h b/src/KeyCode.h
index cb9d2a5..65ab74d 100644
--- a/src/KeyCode.h
+++ b/src/KeyCode.h
@@ -1,17 +1,15 @@
 #ifndef LIBRARY_KEYCODE_H
 #define LIBRARY_KEYCODE_H
 
+class KeyCode {
+private:
+    int value;
+public:
+    explicit KeyCode(int value);
+    int getValue();
+};
 
 const KeyCode Backspace = KeyCode(8);
 const KeyCode tabulator = KeyCode(9);
 
-class KeyCode {
-
-private:
-    KeyCode(int value);
-public:
-    int getValue();
-};
-
-
 #endif
diff --git a/src/LayoutVersion.h b/src/LayoutVersion.h
index 3d0dd54..ce24e93 100644
--- a/src/LayoutVersion.h
+++ b/src/LayoutVersion.h
@@ -2,7 +2,7 @@
 #define LIBRARY_LAYOUTVERSION_H
 
 enum LayoutVersion {
-   V1 = 1;
+   V1 = 1
 };
 
 #endif
diff --git a/src/internal.cpp b/src/internal.cpp
new file mode 100644
index 0000000..d9575d2
--- /dev/null
+++ b/src/internal.cpp
@@ -0,0 +1,5 @@
+#include "internal.h"
+
+Internal internal;
+
+
diff --git a/src/internal.h b/src/internal.h
index e67ce89..65baee5 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -4,6 +4,48 @@
 #include "EventType.h"
 #include "KeyCode.h"
 #include "LayoutVersion.h"
+#include "GraphicMode.h"
+#include "Color.h"
+
+/**
+ * the Control Registers
+ * @author Julian Hinxlage
+ * @since 0.1.0
+ */
+struct Registers{
+    int layout_version;
+    int trigger_reset;
+    int width_pixels;
+    int height_pixels;
+    GraphicMode graphicMode;
+    int autoRedrawInterval;
+    int timerInterruptInterval;
+    Color background_color;
+    Color foreground_color;
+    int characters_per_row;
+    int characters_per_column;
+    int textMode_font;
+    int textMode_font_width;
+    int textMode_font_height;
+    int mouse_pos_x;
+    int mouse_pos_y;
+    char keyboardBuffer[16];
+    int keyboardBuffer_index_w;
+    int keyboardBuffer_index_r;
+};
+
+struct InterruptEntry{
+    int pid;
+    int signum;
+};
+
+/**
+ * internal values for the library.
+ */
+struct Internal{
+    int sharedMemoryPid;
+};
+extern Internal internal;
 
 /**
  * set layout version.
@@ -51,4 +93,5 @@ void buttonPressed(KeyCode keyCode);
 // text area [max_textMode_width * max_textMode_height]
 // pixel area [max_height_pixels * max_height_pixels * sizeof(uint_32)]
 
+
 #endif
\ No newline at end of file
diff --git a/src/vkvm.cpp b/src/vkvm.cpp
new file mode 100644
index 0000000..45218e4
--- /dev/null
+++ b/src/vkvm.cpp
@@ -0,0 +1,6 @@
+#include "vkvm.h"
+#include "internal.h"
+
+void initialize(int pid) {
+    internal.sharedMemoryPid = pid;
+}
diff --git a/src/vkvm.h b/src/vkvm.h
index 1a6e959..a95731f 100644
--- a/src/vkvm.h
+++ b/src/vkvm.h
@@ -162,18 +162,18 @@ void setForegroundColor(Color newValue);
 
 //text mode
 
-/**
- * get characters per line in text mode.
- * @return characters per line.
- */
-int getCharactersPerLine();
-
 /**
  * get characters per row in text mode.
  * @return characters per row.
  */
 int getCharactersPerRow();
 
+/**
+ * get characters per column in text mode.
+ * @return characters per column.
+ */
+int getCharactersPerColumn();
+
 /**
  * get currently used font in text mode.
  * @return currently used font.