Earlier quoted context omitted.
> The 3DS, especially the New 3DSXL is the best handheld to play NES/SNES/GB/C/A games, pixel perfect! For me at least, I think the Steam Deck has it beat these days, although I'll admit I miss the smaller form factor sometimes.
Any starting point for steam dock. A run emulation now. Just treat those rom as well roy and start to hack from that I supposed. Btw that is 6 years ago or starting 7. No need of any update?
If so, I'd recommend EmuDeck [1]. It took me about 10 minutes to set up and has emulators for essentially every platform you could want. (Just need to have roms.) Also, it's open source [2].
[1] - https://www.emudeck.com [2] - https://github.com/dragoonDorise/EmuDeck