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@pifko
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"The reason that the keypad of keyboards and calculators are different is that the first security keycodes had been invented before the touchtone telephone, and did not require the extra + - % / keys and so the touch tone adopted this 1 ,2 ,3 at the top rather than 1 ,2 ,3 at the bottom as it too only required 12 keys."*
http://en.wikipedia.org/wiki/Keypad
http://www.guardian.co.uk/technology/askjack/2006/nov/23/numberpadlayouts