Setting data pin with NanodeUNIO
xyz_dv_eprom.ino uses low-level access rather than Arduino calls to manipulate PD7, most likely for speed reasons. Lines 96 through 104 (specifically 96, 97, 100, and 104) need to be modified in order to change both the port and the bit used.

ATmegaXX8 pin mapping
ATmegaXXX0 pin mapping
ATmegaXXU4 pin mapping