I have a RCUBE Mega that looks like a Mega using Atmel 1280 rather than 2560.
I have been using it for a while but I am not sure about the connectons.
Have anyone the pinout for that board?
(It seems to be a Mega1280 board but I have never seen such or found inf about)
If you look at Products, there is a Hardware Index link to older boards.
Mega 1280 and Mega 2560 share the same pinout.