diff --git a/twinmax/display.h b/twinmax/display.h
index 9fb1578..768e85b 100644
--- a/twinmax/display.h
+++ b/twinmax/display.h
@@ -1,6 +1,42 @@
 #ifndef _DISPLAY_H_DEF_
 #define _DISPLAY_H_DEF_
 
+	#define DSP_MEMORYMODE          0x20 ///< See datasheet
+	#define DSP_COLUMNADDR          0x21 ///< See datasheet
+	#define DSP_PAGEADDR            0x22 ///< See datasheet
+	#define DSP_SETCONTRAST         0x81 ///< See datasheet
+	#define DSP_CHARGEPUMP          0x8D ///< See datasheet
+	#define DSP_SEGREMAP            0xA0 ///< See datasheet
+	#define DSP_DISPLAYALLON_RESUME 0xA4 ///< See datasheet
+	#define DSP_DISPLAYALLON        0xA5 ///< Not currently used
+	#define DSP_NORMALDISPLAY       0xA6 ///< See datasheet
+	#define DSP_INVERTDISPLAY       0xA7 ///< See datasheet
+	#define DSP_SETMULTIPLEX        0xA8 ///< See datasheet
+	#define DSP_DISPLAYOFF          0xAE ///< See datasheet
+	#define DSP_DISPLAYON           0xAF ///< See datasheet
+	#define DSP_COMSCANINC          0xC0 ///< Not currently used
+	#define DSP_COMSCANDEC          0xC8 ///< See datasheet
+	#define DSP_SETDISPLAYOFFSET    0xD3 ///< See datasheet
+	#define DSP_SETDISPLAYCLOCKDIV  0xD5 ///< See datasheet
+	#define DSP_SETPRECHARGE        0xD9 ///< See datasheet
+	#define DSP_SETCOMPINS          0xDA ///< See datasheet
+	#define DSP_SETVCOMDETECT       0xDB ///< See datasheet
+
+	#define DSP_SETLOWCOLUMN        0x00 ///< Not currently used
+	#define DSP_SETHIGHCOLUMN       0x10 ///< Not currently used
+	#define DSP_SETSTARTLINE        0x40 ///< See datasheet
+
+	#define DSP_EXTERNALVCC         0x01 ///< External display voltage source
+	#define DSP_SWITCHCAPVCC        0x02 ///< Gen. display voltage from 3.3V
+
+	#define DSP_RIGHT_HORIZONTAL_SCROLL              0x26 ///< Init rt scroll
+	#define DSP_LEFT_HORIZONTAL_SCROLL               0x27 ///< Init left scroll
+	#define DSP_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL 0x29 ///< Init diag scroll
+	#define DSP_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL  0x2A ///< Init diag scroll
+	#define DSP_DEACTIVATE_SCROLL                    0x2E ///< Stop scroll
+	#define DSP_ACTIVATE_SCROLL                      0x2F ///< Start scroll
+	#define DSP_SET_VERTICAL_SCROLL_AREA             0xA3 ///< Set scroll range
+
 	class Display {
 		public:
 			void Display(const uint8_t width=128, const uint8_t height=32, const resetPin=-1);