The mega pro 5v page is https://www.sparkfun.com/products/11007
You can find the schematics there to check the pinout. There are also some comments about a wrong crystal being loaded; if that’s the case, timing could be off.
The mega pro 5v page is https://www.sparkfun.com/products/11007
You can find the schematics there to check the pinout. There are also some comments about a wrong crystal being loaded; if that’s the case, timing could be off.