Sadly, I still can't get it to work. I tried dsp1.bin, .fig, and .rom ... and put it into the GAMES folder.
I also tried dsp1b. I also put every dsp and cx bios/chip rom I could find in.
No dice.
I also read where the DSP1 has to be split into "program" and "data" roms... and I don't know how to do that. (I have a Mac.)
I got the SEGA CD with BIOS and .cue, etc to work just fine.
But I can't GET Super Mario Kart and the dsp1 or dsp1b to work.
(I've been searching, reading, downloading, trying and testing for a few hours myself... without luck... and mostly just putting the dsp1 in the GAMES folder, etc. ...I haven't done anything overly complex.)
Maybe someone with an actual Flashback 50/100 ... someone smarter than me ... can try it, test it, and post results and the correct procedure... or if alas it won't work at all?
(Maybe the FB needs a different emulator core?)
...my childhood dreams await. Thank you.