MiSTer FPGA Forum

Hi.
SNAC doesn't seem to work on my system.
I have the version with the level shifter and the adapters for Snes, Mega Drive and PC Engine. None of them work.
I bought them in 2021 and they used to work, but I haven't used them ever since. I cannot remember if I tested them with my older analog IO board or with my current one, which is 6.1. But I believe there is nothing wrong with the adapters themseleves.
I recently bought a new SNAC adapter for PS1, which has 2 ports and the video output for the light guns.
This doesn't work either, and that's how I found out that SNAC is not woking on my MiSTer. I have no reason to believe that the PS1 SNAC adapter is broken either.
They all provide power to the controllers, as I can see the 8bitdo Snes receiver turn on and connect to the controller, and the light of the Dual Shock turns on when I press the "Analog" button. But I cannot get any input from them, using different original controllers. Of course I enabled SNAC in the cores settings. I tried to set the jumper next to the IO port to both IO and 3.3v, but it made no difference.
I made my tests on a fresh install of the OS after running the first update.
I bought all my MiSTer components, including the SNAC adapters, from reputable sellers.

So, before I bite the bullet and order a new analog IO board, is there anything else I can try?

I had the same on my Mistercade, just couldn’t get SNAC to register inputs. The PSX adapter had the same symptoms you describe.

Make sure the "USB 3.0" port contacts are good by doing a continuity test of each port pin to the corresponding GPIO connection pin (found on the schematic). The jumper should definitely be in the IO position. I strongly suspect there's a cold solder joint on the board itself.

Thank you for the replies!

Fortunately, I managed to find the issue and the obvious solution.

I followed rhester72's advice and I spent more than a hour doing the continuity test of all the pins, and I even checked that the resistors returned the expected values.
Tracking the pins and looking at the schematics I noticed that all the user port IO signals are connected to the De10 Nano through the P7 connector, the one with 10 pins on a single line which is on the opposite side of the main one, P1.
Well, I realised that I had probably forgotten to insert that connector in its socket and, as the RAM board covers it, I didn't notice. So basically I've used my MiSTer like that for more than 2 years and, as I haven't used SNAC or SOG for all this time, I have't seen any issue.

Properly connecting the analog IO board to the De10 Nano fixed my issue, and now I can finally enjoy Time Crisis on the PS1 with my beloved G-Con 1.

@DiacloneFX Good sleuthing - glad you solved it!