diff --git a/include/boards/avr/megacore64.h b/include/boards/avr/megacore64.h
new file mode 100644
index 0000000..8043b9b
--- /dev/null
+++ b/include/boards/avr/megacore64.h
@@ -0,0 +1,56 @@
+// DirectIO support for megacore 64pin devices
+
+_define_pin(0, PORT_E, 0);
+_define_pin(1, PORT_E, 1);
+_define_pin(2, PORT_E, 2);
+_define_pin(3, PORT_E, 3);
+_define_pin(4, PORT_E, 4);
+_define_pin(5, PORT_E, 5);
+_define_pin(6, PORT_E, 6);
+_define_pin(7, PORT_E, 7);
+_define_pin(8, PORT_B, 0);
+_define_pin(9, PORT_B, 1);
+_define_pin(10, PORT_B, 2);
+_define_pin(11, PORT_B, 3);
+_define_pin(12, PORT_B, 4);
+_define_pin(13, PORT_B, 5);
+_define_pin(14, PORT_B, 6);
+_define_pin(15, PORT_B, 7);
+_define_pin(16, PORT_G, 3);
+_define_pin(17, PORT_G, 4);
+_define_pin(18, PORT_D, 0);
+_define_pin(19, PORT_D, 1);
+_define_pin(20, PORT_D, 2);
+_define_pin(21, PORT_D, 3);
+_define_pin(22, PORT_D, 4);
+_define_pin(23, PORT_D, 5);
+_define_pin(24, PORT_D, 6);
+_define_pin(25, PORT_D, 7);
+_define_pin(26, PORT_G, 0);
+_define_pin(27, PORT_G, 1);
+_define_pin(28, PORT_C, 0);
+_define_pin(29, PORT_C, 1);
+_define_pin(30, PORT_C, 2);
+_define_pin(31, PORT_C, 3);
+_define_pin(32, PORT_C, 4);
+_define_pin(33, PORT_C, 5);
+_define_pin(34, PORT_C, 6);
+_define_pin(35, PORT_C, 7);
+_define_pin(36, PORT_G, 2);
+_define_pin(37, PORT_A, 7);
+_define_pin(38, PORT_A, 6);
+_define_pin(39, PORT_A, 5);
+_define_pin(40, PORT_A, 4);
+_define_pin(41, PORT_A, 3);
+_define_pin(42, PORT_A, 2);
+_define_pin(43, PORT_A, 1);
+_define_pin(44, PORT_A, 0);
+_define_pin(45, PORT_F, 0);
+_define_pin(46, PORT_F, 1);
+_define_pin(47, PORT_F, 2);
+_define_pin(48, PORT_F, 3);
+_define_pin(49, PORT_F, 4);
+_define_pin(50, PORT_F, 5);
+_define_pin(51, PORT_F, 6);
+_define_pin(52, PORT_F, 7);
+_define_pin(53, PORT_G, 5);
diff --git a/include/ports_avr.h b/include/ports_avr.h
index e430513..bd08ee3 100644
--- a/include/ports_avr.h
+++ b/include/ports_avr.h
@@ -160,6 +160,10 @@ template <u8 pin> struct _pins {};
       defined(ARDUINO_AVR_ADK)
 #include "boards/avr/mega.h"
 
+#elif defined(ARDUINO_AVR_ATmega2561) || \
+	  defined(ARDUINO_AVR_ATmega1281)
+#include "boards/avr/megacore64.h"
+
 #elif defined(ARDUINO_AVR_LEONARDO) || \
       defined(ARDUINO_AVR_LEONARDO_ETH) || \
       defined(ARDUINO_AVR_ESPLORA) || \