![]() ![]() CALCULATOR KEYPAD LAYOUT HOW TOBut there was one big question in front of them: how to arrange the numbers. In the early 1960s, researchers at Bell Laboratories were preparing to introduce an alternative to the rotary telephone, something they called push-button dialling (which later came to be marketed as “Touch Tone” dialling). The idea was to stick your finger in the hole and spin it around to dial each number. Instead of buttons, the numbers on the telephone were holes from 1-9, and then 0. rotary design, researchers saw similarity in the calculator key layout. Hence, basically, it evolved from the cash register and the calculators still use the same pattern.īut When Touch-Tone Telephones Were Invented, Why Did They Change Their Layout Without Simply Replicating The Calculator Keypad Layout?īefore the Touch-Tone phones emerged in the early 1960s, there were rotary dials. Have you ever noticed, the keypad of your calculator and the keypad of your. Later, when hand-held and electronic calculators were invented, they implemented the keypad arrangement of the existing calculators – 0 at the bottom, remaining numbers going from 1 in the bottom left corner to 9 in the top right corner. And when mechanical calculators made their appearance, they used the same format as the cash register with 0 at the bottom and 9 on top. This is because “0” is the most used number while making numerous calculations and it made complete sense to place it there so that it is accessible to the fingers easily. These cash registers were designed with “0” at the bottom, and the numbers going up. The story begins back in pre-calculator days when there were mechanical cash registers. And if you are wondering too, here are few theories that explain why! ![]() Nor is it mentioned on the 'keypad' page. This is something that I have puzzled over myself. I searched for 'numpad' on wikipedia to find out why the 123 and 789 keys are placed different from the way they are on for example a phone, but this is not mentioned. ![]() Have you ever observed that the numeric keypads of phones and calculators/Keyboards are reversed? Though both keypads have zero at the bottom, the remaining numbers go from top to bottom on the phone and bottom to top on the calculator. ![]()
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