Any other choice would be a completely new designed system, which would take too long.
So image memory and analog components changes could be the only thing that could be changed to make the PCB a different game. All the PCBs at that time were dedicated and hard logic without microprocessors or programs that could be changed. I made modifications to the PCB by changing the image memories and audio circuits to create a different game utilizing the same PCB. (The company would collapse two years later.) Contractually prohibited from selling the machine themselves, but receiving little in the way of royalties, Exidy decided to change the game just enough to bring it to market as a new product. Unfortunately, the timing of the deal coincided with Chicago running out of, er, coin.
Or at least that’s how it was supposed to go. Image from The Golden Age Arcade Historian.
Chicago Coin flyer for Demolition Derby, “the most unique game ever made”.
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