EM's are my bag but early System 80's are of interest.

I am way into EM's, They are a challenge to trouble shoot but it’s the era I enjoy. I have become familiarized with the early System 80's from Gottlieb because of the restoration of Black Hole. I have one I am putting together from different machines, one complete and two partial. My EM's span from 1961 Magic Cock, Space Odyssey, Bally Twin Win, Big Shot Magic City, North Star, Soccer, Supper Spin and a Sonic brand Prospector.