It's been a while!

I'm only now getting back to rebuilding a pachinko machine I took apart 6-8 years ago. (I hope I remember how to put it back together!) In my box of parts, I found these battle counter boards, but sure enough I don't have any documents to indicate how to use them.

I was hoping someone on here might recognize them and might have documentation for them.

P_20180331_163926_vHDR_Auto.jpg

The boards take 15V in, and come with a set of reflective optoisolators and a reset switch. They use an Atmel ATMEGA 48V.

Anyone remember where I might have got these from?

--InfiniteBlue