I'm cleaning the garret and gonna sale some nice things.
Back from the old skool!!!!!
For the Super Nintendo i have a Super Pro Fighter Q+ 24M with parallel + built in RTS/slow motion card.
DSP works if you set in a Cartridge with DSP chip.
I think it's PAL only, but maybe with other cartrige adapter it may works on other systems.
Without power adapter !!!!!!, i tryed with my Megadrive 1 adapter and the Pro fighter works fine.
€SOLD,- + P&P.
I can give a SNES PAL version for free with this.
I found one yellow broken case SNES , works 100% but look worse.

