Thanks for your replies folks. Looks like the NeoGeo is just Jamma I unplugged the PCB for the tennis game and the connection matched the connector on the NeoGeo PCB perfectly.
Looks like the CP is wired up for 3 buttons which I guess is standard Jamma, any info on how to wire up the 4th NeoGeo button. Where should I start? Any good sites for this?
What I want to do is replace the existing CP with a 2 joystick, 4 buttons each NeoGeo set up so I can buy NeoGeo carts and PCB's. I'll have my Mame cab and my "proper" cab.
Cheers