How to use the multimeter??

You need to know where Vcc and ground are - which you can get from the pinout! Unless you're somehow wiring up LEDs to the buttons, which sounds pretty pointless, then no, you don't need a polarity.

Good luck!

 

The arcade parts still haven't arrived. But I wired it all up and just confirmed the wires worked by holding the signal wires to the ground. manually.

I wanted to have plus'es of the buttons and a single ground seperate so I wouldn't need to have a seperate ground wire for each button. Now I can daisy chain them around and just have one wire going back to the board.

Turns out that for the auto fire option, the action buttons have their own ground on it, but no biggie, that works fine. All the buttons worked (Tomb Raider used all the buttons so it was the perfect game to test button functionality on btw). I also was able to measure lik4 4,8 volts between pin 9(ground) and 1(vcc) while the Saturn was on.

So I got everything sorted now, while it was due to your help that I was able to figure stuff out. I still felt like macgyver holding two wires together to see lara croft perform the appropriate action . Big thanks!

Now I gotta wait for my arcade parts and FGWidget led controller chip...and leds... gonna see what all that arceye talk is about,..