JVS to JAMMA kick harness for New Astro City

[LittleMegaGamer]

I made the following harness to get the extra kick buttons to my New Astro City from the Naomi board through the JVS to JAMMA Sega I/o Board Rev B (838-1368392) - Jumper set in B side. I followed the pin-out for the Rev A that should be the same, but, by testing it with CVS2, I didn’t get any extra buttons (just the 3 punch buttons).
I wonder what I am missing?

I followed this pin-out (just for reference, the first black wire Gnd is pin 14)

 

[Sp33dFr34k]

Rev B pinout is not quite complete, but correct:

1 - 5VDC Out
2 - 5VDC Out
3 - 5VDC Out
4 - P1 button 6
5 - P1 button 7
6 - P1 button 8
7 - p1 button 9
8 - p2 button 6
9 - p2 button 7
10 - p2 button 8
11 - p2 button 9
12 - GND
13 - GND
14 - GND

Your kick harness connector seems to be wired the wrong way around though:

 

[LittleMegaGamer]

Your kick harness connector seems to be wired the wrong way around though:

You are right!
I wired up the AMP UP connector starting from the left (pin 5) instead of the right (pin 1).
That happens when I trust my memory and don’t check the schematic…
I will fix it and back with the result. Thanks! 4 eyes are better than 2

 

[LittleMegaGamer]

I fixed the cable, but I am figuring out that probably I can't get the CPS1/2 6 buttons layout as my cab is set

First, the Jumper on the Sega i/o board has to be set on side A (I got no inputs from the kick buttons on side B)

I was assuming that buttons 6,7,8 indicated on the Rev B board would be transfered as buttons 4,5,6, but unfortunately is not!
I get six inputs now, but, button 4 is 6, button 5 is 7 and button 6 is 8. Practically, I have just HK on button 4 and nothing else on button 5 and 6. I guess because the Naomi can get button 4 and 5 from the Jamma connector, but there is no point to me to change the fastons anytime as I want to use my current layout that takes buttton 1,2,3 from the Jamma and 4,5,6 from the stock auxiliary cable.

Can I get the kick buttons 4,5,6 with an harness cable from the Sega i/o Board?
I know there is a converter that will allow me to use an harness like the CPS2 one but I would like to sort everything with one cable (like the one that I made)

 

[Sp33dFr34k]

That is indeed not how it works, buttons 4 and 5 are on the jamma harness, and you get button 6 from the connector. Or you can solder/wire the kick harness to the jamma pins for button 4 and 5 (or somewhere else if that is more convenient).

 

[LittleMegaGamer]

That is indeed not how it works, buttons 4 and 5 are on the jamma harness, and you get button 6 from the connector. Or you can solder/wire the kick harness to the jamma pins for button 4 and 5 (or somewhere else if that is more convenient).

Indeed it is what I figured-out unfortunately.
My goal was to do an harness that, like for the CPS1 and CPS2, allows me to get straight forward buttons 4,5,6 without changing my CP layout. It looks like that it is not possible by using a Sega i/o board, where I can get just button 6. It could be possible by using a Capcom i/o or a CPS2 converter for the Sega i/o.

 

[Sp33dFr34k]

You could just dual wire buttons 4 and 5 as well, so that they work via both jamma and the kick harness. There are plenty of options to get around this.

 

[LittleMegaGamer]

You could just dual wire buttons 4 and 5 as well, so that they work via both jamma and the kick harness. There are plenty of options to get around this.

Actually I didn't think that! Yes I coud! I already have buttons 4 and 5 from P1 and P2 harness. I could do a dual connection with buttons 4 and 5 coming from the Auxiliary 10pin AMP UP harness and see. I hope that won't have a bad impact when I use Cps1 or 2 (?)

 

[twon]

There was a write up on this very issue where the guy ended up double wiring it and it all worked out. Im going through the same thing and figured id solder 2 wires for buttons 4 and 5 to the jamma harness and terminate it to a connector. That way i could just plug in when using a sega i/o.

 

[LittleMegaGamer]

There was a write up on this very issue where the guy ended up double wiring it and it all worked out. Im going through the same thing and figured id solder 2 wires for buttons 4 and 5 to the jamma harness and terminate it to a connector. That way i could just plug in when using a sega i/o.

I will try it later... we stay in touch on it!