4 button games on blast city?

[tzakiel]

My Blast only has buttons 1-3 wired up for each player. How would I get a game with 4buttons like espgaluda 2 or ddp dfk working? I read about kick harnesses but they don't seem to work with the Jamma edge or something, they require a special connector on the board? Anyway I'm just trying to figure out which wiring I actually need. I do also use a j-PAC for emualtion on the same cab, so something where I wouldn't have different wiring for pcbs vs j-PAC would be awesome but if it has to be different for 4th button so be it.

[gray117]

I'd assume it's just the next pin (pin 25) like D/button 4 on neo geo? ... can't see a pinout online offhand but I'd be suprised if it isn't... afaik that's not taken by anything else on typical jamma setup...

'Kick harnesses' are usually for more than a few extra buttons - and indeed will typically have their own connector on the game board, unique to that platform (yep the kind of thing jamma standard was intended to avoid, but then those capcom people made a very popular game with 6 buttons

[tzakiel]

Thanks yes I figured out that I need to add another wire to the P1 connector. However, I'm not sure how to do that yet.

[gray117]

There should be nothing stopping you from simply running some wires (All that you need to do is daisy chain the ground from other buttons and connect up the other button pin to pin 25)

But specific to blast city connector it looks like you should be able to add into the panel connector @ pin 9?
(I'm guessing it's sw4 / switch 4 you'll be hooking up ... though you may need to check how your various buttons have been connected - presuming they've been pre-wired in that control panel to a certain extent...)

http://wiki.arcadeotaku.com/w/Sega_Blas ... ring_Guide

More general blast city stuff from the lovely arcadeotaku wiki:
http://wiki.arcadeotaku.com/w/Sega_Blas ... _Paperwork