I've released a port of Temper for the RS-90. No idea how well it runs on the RS-90 but seems to be okay on most games according to my tests.
Obviously, don't play Supergrafx games, especially Ghouls'n Ghost, as they will run pretty slow. But if you wanna try, then you can do it.
Let me know how it runs.
Stock FW actually had pretty decent MD/GEN emulation and ok SNES emulation, so a quality port should be able to produce playable results. There are already people on discord clamoring for 16-bit systems to achieve parity with stock...
Whatever they had was far from decent in my opinion. I'll touch picodrive at some point but i'm too afraid to touch PocketSNES... It won't run that well. (it already doesn't on the RS-97, at least Snes9x 1.43)
Would it help if you had one? If so, then hey people, lets either throw some money at the guy (a new RetroMini is about $28 on ebay) or find someone close to his location who would be willing to send him a working unit.
If we go with the first option, I've got my ten bucks ready to go (paypal).
Sadly i can't accept paypal donations as they have been dicks to me and refused to open my account even though i did nothing with it.
Simply put, they behaved like assholes.
So if someone wants to send me a RetroMini, he/she will have to send me his/her to me. I live in France.