You might be a child in the 70s if:

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The company has decided to put tiny little kiosks with their most popular small items on street corners.
They're called Pieces of Sheetz.
 
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Sheetz started in Altoona PA, very close to where I grew up. When traveling I look for them for coffee---rely on them for real half-n-half, not that plastic powder stuff) and gobs (AKA whoopie pies; chocolate cake sandwich with vanilla cream filling). They're now in WV and eastern KY but haven't gotten to PartsUnknown KY just yet.

There are building in Tool-E-Do Ohio as I type this. About 1 mile from me.
 
I am this old but cant find the instruction manual :dontknow:

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I learned to use an abacus around 1991 or so. (I've since forgotten.) I don't remember any of them having 1/4 beads - I'm not sure if that's my poor memory, or an uncommon feature.

In the hands of a skilled user, they are faster than a calculator. I think this is partly because you enter the operations at the same time you enter the numbers, plus you can do multiple digits of the number at once. As a simple example, 12+34 requires six keystrokes on a calculator (1,2,+,3,4,=) but only two moves on an abacus (12,+34).
 
But that's not TRS-DOS. See the tape recorder? No expansion module under the monitor, so no floppy drive. Yes, TRS-DOS ran on the model 1, but not the one pictured.

As a simple example, 12+34 requires six keystrokes on a calculator (1,2,+,3,4,=) but only two moves on an abacus (12,+34).
Huh, what's that last character? The sequence is 1, 2, Enter, 3, 4, +. :p
 
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