New but have a question

[Mattxxxxin1]

I know this is a very old topic but i recently got into buying xxxx in 1 game boards and I wanted to add game roms. I know Maniac-uk wrote up instructions in 2008 but its 2018 now and I was wondering if anyone knows a easier way or a way to design your own program the game board runs on. Or any new info on the boards. Thank you