DENNIS YOU are amazing, I am ashamed to say how much time i spent, more than a few hours going thru ipdb pictures, you know, when you see something in a book from decades ago, my recollection was --hazy but I couldn't shake the curiosity-- that the words had a yellow background and were either in the middle or one the bottom, no, there WAS yellow nearby but not in the words.
And Vic, you were right about the people in this group, they obviously know this stuff up and down, and I hope to get on good terms with them as I am in the process of making my own pinball machine with old parts and what i hope will be a new wedgehead cabinet, and an aruduino chip to do the switching.
That has been interesting in its own right. for example with an aruduino, you only need the nines position switch and a coil wires and you can control everything thru software. For things to shoot at I have done the software for a varitarget and that was interesting. I have found out, that as the target moves at 'our' speeds, the computer is so fast that it is reading all the contacts as fast as i can push the target. With em control, it would move, lock in and the score motor and relay would determine the score, with a computer it reads everything on the way up. So you make changes to software etc. i was a programmer in my former life but i never knew anything much about electronics, well this makes it easy to learn about that too. I never knew what a capacitor did, but apparently it just is there to soak up back flowing voltage to prevent damage to other things. Gotta keep things going on in life.