Here’s why telephones and calculators use different numeric keypads

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Here’s why telephones and calculators use different numeric keypads
By Francesco Bertelli


Picture the keypad of a telephone and calculator side by side. Can you see the subtle difference between the two without resorting to your smartphone? Don’t worry if you can’t recall the design. Most of us are so used to accepting the common interfaces that we tend to overlook the calculator’s inverted key sequence. A calculator has the 7–8–9 buttons at the top whereas a phone uses the 1–2–3 format. Subtle, but puzzling since they serve the same functional goal — input numbers. There’s no logical reason for the inversion if a user operates the interface in the same way.…

This story continues at The Next Web


December 31, 2018 at 07:00PM
via The Next Web http://bit.ly/2An10aD

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