If memory serves, it wasn't the individual tubes as per this calculator, but a single-tube VFD. I'm saddened sometimes by the amount of lovely electronics that has probably ended up in the local landfill.
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My dad was an accountant and had a lovely mains powered VFD calculator. Being a budding engineer and tinkerer I couldn’t resist taking it apart. I was disappointed by how little there was in the box.
My brother had a Casio Personal M1, with single-tube VFD (brilliant display and keyboard). I had a Commodore similar to a 796M with the "bubble" LEDs (awful display and okay keyboard). The Casio was miles ahead despite similar features, just so much nicer to use.
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