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3. What? Disabling the carging circuit is a standard part of the coin cell mod, and not a problem.

Has anyone ever been successdul with a rechargeable one? Seems like the regular CR2032 non-rechargeable mod is easier and widely preferred. I've had the batteries hold the charge in more than one MVS board for years.

I had a MV-IC memory card reader board with bent pins, preventing the card from being inserted. It was also disgustingly dirty with black sludge. I was able to fix it by spending a bunch of time bending the pins back with a sewing needle.

I want to thank you again for the detailed instructions, and for documenting the V rom issue with this game so well, @Niko, because today I was finally successful thanks to all of this! Thank you again to everyone else who chimed in and helped/encouraged me along the way. In hindsight, I did...

4.0 has been the latest version since 2018.

Thanks for confirming. I bought four of the flash memory chips with the corrected rom on them from buyicnow this time around, so I have three left. I think I'll clean it up and give it one more try before giving up and ordering a new cart.

Should be pins 33 and 34. Per the datasheet of the chip I'm using, that's Vss and OE#. So if I'm understanding correctly, if it's not broken, then that OE# pin should be tied to Vss to pull it high to enable reading from the chip...

That's the answer I was hoping for, thanks. I was hoping that's the case, but not familiar enough with this type of PCB and its connections to make that determination myself. Will check further. Still though, I'm not sure if it's worth continuing to try in this condition with my skill level. If...

Already did. I know it can be cleaned better, but at this point it has been desoldered four times, so it's burnt up, and I'm just trying to show there are some bridged solder pads. No point cleaning it more now, because it's toast. Unless those two pads are supposed to be bridged?

Two years ago when I was working on this, my wife, who usually helps me with the detailed solder work, said she wanted to take a crack at this. Well, I think she was way out of practice when we finally got around to this just now and seemed to struggle. I'm pretty sure this is broken now. The...

If you want it to work normally, then yes, I would try undoing that mod.

Yeah, good luck with that strategy, if you ever bother to play.

The Omega MVS doesn't load carts backwards. Certain aftermarket carts are labeled backwards. The Darksoft Mulit only appears to have a standard label on the top, so it's not a concern here.

I thought I remember it being confirmed that the mahjong controller will work om those.

What are OUT1-OUT3 for?

If it's working for you then consider yourself lucky, as it's really a crapshoot whether the games will work together or not, especially once you start getting aftermarket carts involved. You even mentioned they crash sometimes.

Swap around the games and reset the backup ram.

3.58MHz for NTSC, 4.43MHz for PAL Unrelated to the above crystals by the way, I prefer the slightly faster crystals to the 24 Mhz ones for better picture quality, but they will both work, and won't cause the stability issus you're having. You can build replacement oscillators that customize to...

Did you reflash the same chip? Could be the chip.

The "-PAL" is marked on the AC adapter, but not on the bottom of the console. After all, the console only cares what voltage it's getting, not what kind of mains you're using. Here's an example PAL console: https://www.neostore.com/PAL-220V-Neo-Geo-AES-console-system-boxed-p/569.htm Again...