Using that formula, the resulting rows fell into place, with zero getting its own row at the bottom.Īll of these theories attempt to explain why telephone and calculator keypads are exact opposites, yet no one theory can be pinpointed as the definitive reason. But putting 1 on the top-left, and the subsequent numbers to the right, did make sense. When designing the new touch-tone keypad, putting the 1 on the top-right didn't make much sense, because Western writing is read from left to right. On a rotary dial, 1 is at the top right and zero is on the bottom. After testing several layouts, including one that used two rows with five numbers each and another that used a circular positioning, it was determined that the three-by-three matrix that had 1, 2 and 3 across the top was the easiest for people to use.Īnother theory is based on the layout of a rotary telephone. This study involved testing several different telephone-keypad layouts to find out which was easiest to master. This theory has little proof to substantiate it, but it does make sense.Ī second theory refers to a study done by Bell Labs in 1960. The telephone designers figured that if they reversed the layout, the dialing speeds would decrease and the tone-recognition would be able to do its job more reliably. The tone-recognition technology could not operate effectively at the speeds at which these specialists could dial the numbers. They could hit the numbers extremely quickly, which was great for data entry, but not so great for dialing a touch-tone phone. Data-entry professionals, and others who used calculators fairly regularly, were quite adept at navigating these keypads.
To wake up the computer, press any key or the power button.
Fn + 4: Press Fn+4 to put the computer into Sleep mode. Fn + S: This key combination has the same function as the SysRq key on a conventional external keyboard. When the touch-tone telephone was being designed in the late 1950s, the calculator and adding-machine designers had already established a layout that had 7, 8 and 9 across the top row. Fn + P: This key combination has the same function as the Pause key on a conventional external keyboard. The first theory deals with the telephone's circuitry and tone-recognition hardware. The reasons behind the differences are not known for certain, but a few theories exist. It is pretty odd that a calculator and a touch-tone telephone have exactly opposite layouts for their keypads, which have many identical components.
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