OP

Quoted from pincoder:

Hi Everyone,
While I'm still developing my ideal pinball troubleshooting board for your Williams system 3 through 7 pinball machines, I have come up with an intermediate solution for those who need to get their machines up and running today.
It's called the Pincoder Adapter, it comes preloaded with the Pincoder diagnostic software, and is ready to go out of the box. You do not need a chip programmer or any chips to use it.
You can find out more about the adapter here:
https://pincoder.ca/index.php/2020/07/10/adapter-2020-06-23-0506/
At the moment, online purchase is not available, however see the link above to find how how you can obtain one.
Of course, if you have questions you can certainly ask them here and I'll be happy to answer.
Thanks and happy repairs!