Progress being tracked here: https://github.com/LIJI32/SameBoy/issues/484
tl;dr the idea is to work on the foundations of a really solid existing emulator written in C and see if it's possible to squish its performance into the constraints of Playdate The three other emulator projects all cited performance challenges, so the horizon's already looking stormy but I'm setting sail nonetheless.
Unfortunately, this is all a hypothetical sailing adventure for me right now because I won't be getting hardware until sometime next year — if anyone's got access to hardware and a penchant for performance optimization puzzles, would love to jazz with you! I'll be pushing all of my WIP stuff to my fork of SameBoy.
Latest visual update, showing audio + control + rendering working: https://github.com/LIJI32/SameBoy/issues/484#issuecomment-1207631559