Update on some comments, make the MOTHERBOARD list complete again.

Marlin/Configuration.h

 //#define BAUDRATE 115200
 
 //// The following define selects which electronics board you have. Please choose the one that matches your setup
-// Gen7 custom (Alfons3 Version) = 10 "https://github.com/Alfons3/Generation_7_Electronics"
-// Gen7 v1.1, v1.2 = 11
-// Gen7 v1.3 = 12
-// Gen7 v1.4 = 13
-// MEGA/RAMPS up to 1.2 = 3
-// RAMPS 1.3 = 33 (Power outputs: Extruder, Bed, Fan)
-// RAMPS 1.3 = 34 (Power outputs: Extruder0, Extruder1, Bed)
-// Gen6 = 5
-// Gen6 deluxe = 51
-// Sanguinololu 1.2 and above = 62
-// Melzi = 63
-// Ultimaker = 7
-// Teensylu = 8
-// Gen3+ =9
-// Megatronics =70
+// 10 = Gen7 custom (Alfons3 Version) "https://github.com/Alfons3/Generation_7_Electronics"
+// 11 = Gen7 v1.1, v1.2 = 11
+// 12 = Gen7 v1.3
+// 13 = Gen7 v1.4
+// 3  = MEGA/RAMPS up to 1.2 = 3
+// 33 = RAMPS 1.3 (Power outputs: Extruder, Bed, Fan)
+// 34 = RAMPS 1.3 (Power outputs: Extruder0, Extruder1, Bed)
+// 4  = Duemilanove w/ ATMega328P pin assignment
+// 5  = Gen6
+// 51 = Gen6 deluxe
+// 6  = Sanguinololu < 1.2
+// 62 = Sanguinololu 1.2 and above
+// 63 = Melzi
+// 7  = Ultimaker
+// 71 = Ultimaker (Older electronics. Pre 1.5.4. This is rare)
+// 8  = Teensylu
+// 9  = Gen3+
+// 70 = Megatronics
+// 90 = Alpha OMCA board
+// 91 = Final OMCA board
 
 #ifndef MOTHERBOARD
 #define MOTHERBOARD 7

Marlin/pins.h

   #endif 
 #endif //ULTRA_LCD
 
-#else // RAMPS_V_1_1 or RAMPS_V_1_2 as default
+#else // RAMPS_V_1_1 or RAMPS_V_1_2 as default (MOTHERBOARD == 3)
 
 #define X_STEP_PIN         26
 #define X_DIR_PIN          28
 #define TEMP_1_PIN          -1   
 #define TEMP_2_PIN          -1   
 #define TEMP_BED_PIN        1    // MUST USE ANALOG INPUT NUMBERING NOT DIGITAL OUTPUT NUMBERING!!!!!!!!!
-#endif
+#endif// MOTHERBOARD == 33 || MOTHERBOARD == 34
 
 // SPI for Max6675 Thermocouple 
 
   #define MAX6675_SS       49
 #endif
 
-#endif
+#endif//MOTHERBOARD == 3 || MOTHERBOARD == 33 || MOTHERBOARD == 34
 
 /****************************************************************************************
 * Duemilanove w/ ATMega328P pin assignment
 *
 ****************************************************************************************/
 #if MOTHERBOARD == 9
-#define MOTHERBOARD 6
+#define MOTHERBOARD 6   /*TODO: Figure out, Why is this done?*/
 #define KNOWN_BOARD 1
 #ifndef __AVR_ATmega644P__
 #ifndef __AVR_ATmega1284P__