Solenoids

The M6800 implementation of solenoids uses the 120Hz ISR to control the solenoids. They did this for several reasons: Time out the duration that solenoids are kept on. According to the Bally Theory of Operation document most solenoids need to be kept…

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Lamps

Compared to the displays, writing to the lamps is fairly easy. Well, that's not exactly true. It's fairly easy once you understand how they're using the MC14514 chip, which actually took me a little while to figure out. My first attempts weren't…

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Displays

The games I've worked on have five 6-digit displays. There are four player displays and one for credits/ball-in-play. These displays only show one digit at a time, but they flip so quickly between them that it looks like all six are on…

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