Assign buttons to combos, to play 4 button games on 3 button setups

[Amplifuzz]

So, I'd like to play a few 4-button games on an old arcade cabinet that's got 3 buttons per player. What's the best way to assign button D to a combo (like B+C for example)? It should work across all libretro arcade cores.

[mitu]

@Amplifuzz I don't think that's supported by RetroArch front-end at the moment. There were some cores that supported button combinations (e.g. lr-fbapha), but that's not something that's generally supported.

[Amplifuzz]

lr-fbalpha is the main core I would need this on, and for the life of me I can't find a way how.

I had this from time to time:
https://retropie.org.uk/forum/topic/19244/two-buttons-equals-one-input

but now it doesn't appear anymore and I don't know if it's game-dependent or they removed it in un update from .43 to .44

EDIT: seems to be game-dependent, but with no particular reason as to why it's not there when it's not.

[mitu]

@Amplifuzz said in Assign buttons to combos, to play 4 button games on 3 button setups:

but now it doesn't appear anymore and I don't know if it's game-dependent or they removed it in un update from .43 to .44

As you've found out, it's something that's being removed, so there's no upstream support for this going forward.