Why is the keyboard layout QWERT instead of ABCDE?

The reason why the keyboard is standardized to the current "QWERTY" keyboard layout is because the keyboards of typewriters are arranged alphabetically at first, and typewriters are mechanical typewriters, so if the typing speed is too fast, some key combinations are prone to key sticking problems.

Christopher latham Shoals solved the problem. He invented the layout of QWERTY keyboard. He put the most commonly used letters in the opposite direction, which can minimize the typing speed and avoid getting stuck.

Christopher Larsen Shoals applied for a patent for this design in 1868, and the first commercial typewriter with this layout was successfully put on the market in 1873.

However, in practical use, it is found that the layout efficiency of QWERTY's keyboard keys is very low. For example, generally speaking, people are right-handed, but using a keyboard with QWERTY results will make the left hand bear 57% of the workload. The little finger and the ring finger of the left hand are both weak fingers, but they should be used frequently.

The letter line only accounts for about 30% of the whole typing work and is located in the middle column of the keyboard. Therefore, in order to type a word, people often need to move their fingers up and down.

1888, an open typing competition was held in the United States. A court stenographer named Ma Jialin typed blindly according to a clear fingering division. The speed is very fast, and the error is only three ten thousandths, which surprised everyone present.

According to the records, Ma Jialin won a prize of 500 dollars at that time. Since then, many people have begun to follow this typing method. Typing technology for the blind has become popular in the field of professional typing, and schools specializing in training typists have begun to appear in the United States.

Extended data:

repair

First, the "computer boot can not search the keyboard" fault maintenance

There are many factors that lead to the inability to search the keyboard, such as weak connection, damaged keyboard interface, wiring failure, damaged motherboard and so on. , but the main problem is almost connection (the probability is about 60%). For this kind of fault, it is usually to turn it off first, then unplug the keyboard connector and plug it into the keyboard interface on the motherboard.

Second, the "keyboard key failure" fault maintenance

Keyboard keys are out of order, usually due to dirt on the circuit board or conductive plastic, which leads to abnormal connection. Other factors are also possible, such as keyboard plug damage, wiring failure, motherboard damage, abnormal CPU operation and so on. But they are not the main reason. Therefore, only descaling work is needed.

The operation steps are as follows (note that the scissors-foot keyboard is mainly used for notebooks and belongs to the super-book keyboard. Please don't disassemble the keyboard for personal maintenance, otherwise it can't be put back):

1. Disconnect the keyboard. Note that when opening the keyboard, the button surface (that is, the side we operate) must be facing down and the circuit board should be facing up, otherwise the conductive plastic on each button will fall off one after another, which will bring trouble to your maintenance.

2. Open the circuit board. Usually, the circuit board is made of soft plastic film with button cable engraved on it. Gently scrub with alcohol cotton with concentration of 97% or above or medical alcohol cotton with concentration of 75% or above. For the circuit of the button fault part, it needs to be wiped several times.

3. Check the conductive plastic of the faulty part of the button. If there is a lot of dirt on it, scrub it with alcohol. Assuming that the conductive plastic is damaged, it is suggested to replace the conductive plastic on the unused keys with damaged parts. Although this measure can't make the keyboard play all functions, it can at least prolong the life of commonly used keys.

4. Clean the dirt in the corner of the keyboard. The tool can be a brush, a small brush, etc. , but be careful.

5. Check whether the welding module has virtual welding or desoldering. If you can use an electric soldering iron, you can repair the welding. Of course, this step only applies to friends who can use an electric soldering iron. Please skip this step for those who can't.

6. After installing the keyboard, it is important to note that the alcohol must be completely evaporated.

References:

Baidu encyclopedia-keyboard