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[NeoSeeD]

Can 4 player be done on Mister?

Yes. The updated Neo core was released a few months ago.


Post by Sorgelig » Tue Sep 09, 2025 8:08 am

NeoGeo:
- Add support for multitaps NeoTris and NEO-FTC1B.
- Updates for romsets.xml
- Updated framework.

 

[Neo Alec]

Ah, there is additional hardware.

I'm not a hardware guy at all, so this might be wrong. But I *think* it does this:

The BIOS sets the output wire either high or low depending on which set of players it wants the inputs from. The board reads those controllers and returns the corresponding inputs. Those inputs come into the Neo via the same REG_P1CNT/REG_P2CNT as any other game, but the BIOS knows which player they are for as it set the output line, so it copies them off into memory, where then Kizuna Encounter can read it.

If that is correct, it would only read inputs at 30fps, which is not great for a fighting game, but probably still good enough as this is really just a novelty.

Maybe, maybe not. It's a tag team game, so it really only has to be able to read from 2 of the 4 controllers at a time.

 

[city41]

Maybe, maybe not. It's a tag team game, so it really only has to be able to read from 2 of the 4 controllers at a time.

That would be cool if the hardware was built with this in mind. I could be wrong but I don't think it is. The output line going high or low allows it to read two predefined sets of inputs according to the wiki



So on any given frame, it can either read the first characters from each team or the second. So if it's team 1 char 2 versus team 2 char 1, it would have to take two frames to grab all the input.

Oh, it's also possible it can do both reads within a single frame. I've never actually tried that, can you read the registers that fast? That would be a fun experiment. EDIT: the more I think on it, the more I think this is likely. The NES reads its inputs one at a time and gathers them all within one frame, so it seems reasonable the Neo could read the register twice.

 

[Neo Alec]

It seems reasonably well documented (he says as someone that doesn't necessarily understand what it all means) and there have been a couple people over the years that have made efforts at reproducing the board but it seems like it always peters out before reaching a stage of finalizing everything.

NEO-FTC1B board - NeoGeo Development Wiki

wiki.neogeodev.org

Neo geo Kizuna Encounter 4p board

I know of the NTM repro but has there been any work put into a more widely available repro board? Is this on anyones radar as a project at all?

www.arcade-projects.com

I'd like to try it at some point, but it's just the one game. So it's tough to want to spend tons to do so. Although I think the Block Panic DX 4 player is implemented the same way so that could be another reason to justify some expense I guess.

Here's one someone made:

https://twitter.com/i/web/status/1978016350543974611

 

[lithy]

Here's one someone made:

https://twitter.com/i/web/status/1978016350543974611

Yeah Kevums has/had one of those, seems someone in France made some but not many, I haven't come across one for sale.

Ever wanted to play 4-player Kizuna?

But does it work with Bomberman? It's unfortunate, but no 4-Player with Neo Bomberman - the one Neo-Geo game that would have benefited from the device. I love Neo Bomberman, but because it's slower paced than other Bomberman games, playing 2 player deathmatch is a slow affair. Thankfully the...

www.neo-geo.com