How does this work?
this post was submitted on 07 Aug 2024
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here I found a video demonstrating that kind of machine, not the same brand and model but very similar. the vid's is French tho : https://youtu.be/vOGtYgu7V7Q
Stick a pen tip into the slot at one of the numbers and scrape it upwards for adding, downwards for substraction.
The display updates with the new sum.
Mine came with more complicated instructions for handling more advanced forms of math, as well, but I immediately forgot those.
Somebody needs to make a 3D printable project out of this. It would be fun to have, but I'm not going to scour eBay for a working one.