-// #define SERIAL_PIN_DDR DDRD
-// #define SERIAL_PIN_PORT PORTD
-// #define SERIAL_PIN_INPUT PIND
-// #define SERIAL_PIN_MASK _BV(PD?) ?=0,2
-// #define SERIAL_PIN_INTERRUPT INT?_vect ?=0,2
+// #define SOFT_SERIAL_PIN ?? // ?? = D0,D1,D2,D3,E6
+// OPTIONAL: #define SELECT_SOFT_SERIAL_SPEED ? // ? = 1,2,3,4,5
+// // 1: about 137kbps (default)
+// // 2: about 75kbps
+// // 3: about 39kbps
+// // 4: about 26kbps
+// // 5: about 20kbps