As far as pinball/arcade goes, the last innovation was converting the Sun Valley to a
True 2 Player Add-a-Ball.
Although to my knowledge there isn't any known, there's evidence a handful may have
been made.
From experience with Chicago Coin from this era, I believe the only way to add a ball was
when a certain amount of points were scored, which I did with this machine. But I also made
it so not only 200 points are made when getting all 9 numbers on the same ball, but also a ball
is awarded. I did that by fabricating an off-on-off wiper from a score reel unit.
The high score took a little time, but having it give an added ball by getting all 9 numbers on
the same ball took a little experimenting..
btw: I had that glass made using the image of a Replay glass. Just had to add in the
"SHOOT ADDED BALL NOW" to the glass..
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