In terms of coding functions, keyboards can be divided into two types: fully coded keyboards and non coded keyboards.
A fully encoded keyboard is a keyboard recognition function completed by hardware. It generates a corresponding encoding information (such as ASCII code) by identifying whether a key has been pressed and the position of the key pressed. A non coding keyboard is a keyboard recognition function completed by software. It uses simple hardware and a dedicated keyboard coding program to recognize the position of keys, and then the CPU converts the position code into corresponding coding information through a lookup program. The speed of non coding keyboards is relatively low, but their structure is simple, and software can provide great convenience for redefining certain keys.
