My MiSTer setup includes a digital I/O board, Blisster v2, and HDMI SNAC adapter. I was successful using the Cirka S91 replica SNES wired controller using the Bliss-box SNES -> HDMI cable with Blisster's LLAPI.
Unfortunately the same cable and controller do not work with the SNAC. Pressing "B" is read as the "A" button and down + left on the D-pad is read as "Down" - but down is not. I know the SNAC is working because the 8BitDo SN30 2.4G wireless SNES gamepad works fine with the same Bliss-box SNES -> HDMI cable on SNAC.
I'm confused why... I know voltages are an issue, since older controllers expect 5v but the MiSTer runs at 3.3v. The jumper on the SNAC is closed and I haven't touched any of the switches on the DE10 Nano board.
Am I missing something?