I've been wanting to use my 8BitDo Retro Receiver to play Joy2B+ games for a while. Last year I made a passive adapter that works for the B and C buttons, but reading A and Start from a Mega Drive controller requires active scanning.   Since I already had a JOY2PIC programmer after building @mytek's TK-II and 1088XEL projects, and a microcontroller seemed like a good fit for this application, I decided to use a PIC to do the job. I picked the 16F1847 because it's used in the 1088XEL an