There was an article in i think Radio Electronics at the time to connect it to a C64.
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https://colorcomputerarchive.com/repo/Documents/Magazines/Ho...
>By moving the joystick (a mechanical linkage), you select one of a series of rotating cams that connect a gear to the power shaft. This is probably the worst design possible for modification to electronic control.
At the time I was disappointed that it didn't use (non-existing) motors already in the Armatron but looking back at it with an understanding of the mechanical design, it's easy to see why they went with that decision. The only other choice would have been to connect to the joysticks themselves. The added motors probably improved the operation quite a bit.