At first, the letters on the keyboard were arranged alphabetically, but after a long time, I found it uncomfortable. Later, according to the usage frequency of letters in English words, a new keyboard layout was arranged, with the most commonly used letters in the middle. This is because the typewriter used to poke hard with the index finger, so try to be close to the center of the keyboard. If you put it on both sides, it will be tragic if you use too much force.
Later, the computer keyboard appeared, and the most commonly used letters were placed closest to the index finger, which also unified the arrangement of the keyboard, so now it is much faster to input English with the keyboard than the original keyboard.
Analysis of letter setting principle;
8-key letters set standards and serve English input according to English habits. The alphabetical order of English is A-Z, and the alphabetical order of numeric keyboard is also a-z; The letters q, x and z are not commonly used in English.
So keys 7 and 9 on the numeric keypad are four consonants on one key. English requires word spacing, so the 0 key of the numeric keyboard does not set letters, but only acts as the space bar.
English often uses periods, so the number 1 key on the keyboard has no letters; The 8-key letter setting is equal to the 8-base system, only a multiple of the 2-base system. English letters easily correspond to binary numbers.