To turn on .. off LEDs on WRAP SBC #led3on echo "A" | dd of=/dev/port bs=1 count=1 seek=62466 #led3off echo "L" | dd of=/dev/port bs=1 count=1 seek=62466 #led1 and led2 on echo "A" | dd of=/dev/port bs=1 count=1 seek=62464 #led1 and led2 off echo "L" | dd of=/dev/port bs=1 count=1 seek=62464 #led1 on led2 off echo "H" | dd of=/dev/port bs=1 count=1 seek=62464 #led1 off led2 on echo "D" | dd of=/dev/port bs=1 count=1 seek=62464 >>> Denary2Binary(ord("A")) '1000001' >>> Denary2Binary(ord("L")) '1001100' >>> Denary2Binary(ord("H")) '1001000' >>> Denary2Binary(ord("D")) '1000100'