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Yes, but not recently. GBSC I have isn't great (from Aliexpress, the one I built is in a cab so can't test with it), OSSC (which is what I primarily use), RetroTink 5x (I can never get these to work well with Neo Geos), and a Medusa scan doubler. I'll see if I can replicate it with another...

And it's happening again... so not the capacitors, any other ideas from anyone?

Well they're just exposed traces for the carbon pads to contact. EasyEDA has a good template for it, but I'm still struggling with KiCAD. It's just been too long since I last used it and I don't remember anything. May have to do a refresher tutorial when I have time...

Yeah, I think the original mahjong controllers are going for around $1,200 USD. I think if I had one I would have gotten frustrated with it not working with a supergun, @pierpa86 was able to point me in the right direction to build the above adapter to pull in the three missing pins. Now I'm...

Confirmed this setup works with a MV1B, not that there was much doubt but hadn't tested to be sure. (ignore the mess)

Confirmed via multimeter, when in AES mode OUT3 is bound to SELECT. Nifty.

Not that I could tell, but I'll keep seeing if I can probe around on it.

Reversed the order of the three wires going to the MV1C CN1 and I think it's all up and running! (still no idea what the AES/MVS switch on this weird controller does)

Found one wiring mistake so far, hooked it all up and at least there's no magic smoke coming out. But it looks like I have something wrong, H through N register correctly, but A to G and PON, CHI, KAN, ROW, REACH are reversed...

Not my cleanest work, but should do for a prototype. Still need to check for shorts etc but I think this will work.

That tracks, still might pick up a copy if I stumble upon one. For the mahjong controller, this is where I'm at. Digging through my stuff piles I have a couple simple prototype boards and a DB15 pass through & breakout PCB. Thinking I can pull GND and VCC from the supergun DB15 (pin 1 and 8...

Didn't know anyone did a MVS conversion. Think I have FR2 on NGC, but not sure how to go about testing the mahjong controller on AES or NGC systems.. I do have a SD Loader modded unit around here in one of the piles, wonder if there's homebrew that could test it (or if I could develop such). My...

I may need to first build an adapter based on what @pierpa86 is doing. This is too much of a hassle to test with... I'll need to be able to quickly determine if my design is working as expected without needing to tear apart my "big red".

Mouser always lists them as “restricted inventory”, so the times I’ve needed them I always have to scrounge. And yeah, never been too clear on their purpose beyond the FCC saying they need to be there. (for my own notes on CN1) CON1 pin 1 - NC (ground) pin 2 - NC pin 3 - pin 9 of 2up joystick...

Do you have a source for the zbf253d's? I can always scavenge them from failed boards, but I don't know of anyplace they can be purchased...

Confirmed that everything works with hardware dip 3 set with UniBIOS. So looks like even on hardware that supports such mahjong controllers you need a JP or universal BIOS. Now that I have a known working controller I’ll dig into designing a PCB for the Famicom controller and see if I can figure...

For whatever reason, I can't get into a mahjong IO test on my MV2FS, thinking it may be down to the BIOS variant it's running (US or EU). Will have to try swapping it out for UniBIOS 4 this weekend.

Good to know, lamentably my MV2FS is in a "big red" which means the hardware dip switches are inaccessible (the 2F has the dips on the side by the DB15s but the 2FS has the dips next to the PCMCIA slot which is pressed up against the front of the cab). So will need to remove it before I can test...

@pierpa86 I've been following along with your thread and concur that some extra steps are needed. I want to figure out how to do a baseline check before I get too far into the weeds. Thinking I'll try a MV2F if I can't find a working MV1 in the parts pile.

While I can get in, the controller seems to not work as expected. At least not with the setups I have. The seller tested it, but with systems like a MV1 that have a DB15 IO port built in. Seems to not like superguns... but I would expect it to register some sort of input. May have to probe...