The program file attached compiles on Win8.1 with avr-gcc and programs a Mega2560 clone dev board, but won't blink the on-board LED.
I know the programmer, AVRdude and the dev board work fine because an old hex file of a blink program actually does cause the LED to blink. It was developed some years ago on Win7 using the same compiler version.
I just can't seem to recreate the program. What do you think is wrong or missing ?
TIA, Ray