The pin-out mapping is very similar to the Base v1.3 an MPX.3 they do not have a H6 connector
You may note : two ICSP ports on controller. H6 is a standard ICSP header, but for programming the ATmega 16U2
https://storage2.proboards.com/71398...rSHMAaKDxh.png
One of my projects is Finished
Attachment 17296