I tested some games from "samcoupe_flop" in mame.
They work very good on the pi4.
Just typing boot and they will run.
(edit : I added the possibility to install autoboot in systems with extras -> full / semi automatic boot)

Only one thing, the used cursor keys for playing games are :

for many games a,s,o,p,space. for some games q,w,space. other games use the normal cursor keys.

So it's advisable to use the game specific runcommand loaders for mame or lr-mess.
That way you can customize the keys used per game.

Here are some pictures of manic and ppersia :
2021-11-26-214220_800x600_scrot_resized.png 2021-11-26-214344_800x600_scrot_resized.png

@mediamogul I am using the Pi 3B+ but when i was using a Pi 3 awhile back i had it overclocked to like 1.35Ghz and was still running pretty good from my experience.