It's the dev cart I posted earlier. I flashed a 27c160 EPROM with the rom extracted from a SNES Classic. That's a RGB modded SNES Jr hooked up to a framemeister via RGB, hence the HD. If you didn't see the other post, here's what the dev cart board looks like: https://imgur.com/a/MPpzW It's a SuperFX 2 dev cart.

To answer questions about the setup:I'm not going to share the rom, I just wanted to give the good news that it does run.