A brief history of the numeric keypad

There is no logical reason why the numeric keypads of phones and calculators are different. So why are we still using established patterns today?





Imagine the numeric keypads of a phone and a calculator lying side by side. Can you spot the differences without taking out your smartphone? Don't worry if you can't remember the location of the numbers. Most of us are already so used to familiar interfaces that we don't notice the reverse sequence of numbers on the calculator. The top row of the calculator contains buttons 7-8-9, while the phone uses the 1-2-3 format.





Phone keypads (left) and calculator (right).
Phone keypads (left) and calculator (right).

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  • Bellis, M. (2018). Who Invented the Cash Register? [online] Thoughtco.com. Available at: https://www.thoughtco.com/cash-register-james-ritty-4070920 [Accessed 9 Jun. 2018].





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  • Lutz, M. C., & Chapanis, A. (1955). Expected locations of digits and letters on ten-button keysets. Journal of Applied Psychology, 39(5), 314โ€“317.





  • R. L. Deininger (1960). Human factors engineering studies of the design and use of pushbutton telephone sets. The Bell System Technical Journal, 995โ€“1012.





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