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I'm looking for computers that could be physically small (and still computers). COSMAC ELF counts as one -- 12 switches, LED, and 2-digit hex display.

These days, I have smartwatch (Bangle.js2), and they are programmable, but you can't program them on device, so I would not call that "computer".

Are there other examples I should look at?

Any ideas how to input programs on device as small as smartwatch? Anything suitable for smartphone size?
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