Typewriters are the definitive ancestor of all key-based text entry devices, but the computer keyboard as a device for electromechanical data entry and communication largely … 展开

One-handed keyboards
Many keyboards have been designed for one-handed operation. The first one, a chorded keyboard, was invented by Douglas Engelbart. Other types of one-handed keyboards include the FrogPad, the Half … 展开

Keyboards and keypads may be illuminated from inside, especially on equipment for mobile use. Both keyboards built into computers and … 展开

Optical character recognition (OCR) is preferable to rekeying for converting existing text that is already written down but not in machine … 展开

Different types of keyboards are available and each is designed with a focus on specific features that suit particular needs. Today, most full-size keyboards use one of three different … 展开

Alphanumeric
Alphabetical, numeric, and punctuation keys are used in the same fashion as a typewriter keyboard to … 展开

Key switches
In the first electronic keyboards in the early 1970s, the key switches were individual switches inserted into holes in metal frames. These … 展开