| Development | Year | Derived from first mouse | |-------------|------|--------------------------| | Xerox ball mouse | 1972 | Wheel mechanism replaced by ball | | Apple Lisa/Macintosh mouse | 1983/1984 | Buttons increased to two; optical encoder disk | | Optical mouse (first commercial) | 1999 | Relative displacement principle | | Touchpad (indirect derivative) | 1990s | Maintains relative positioning without moving parts |
Despite its brilliance, it took nearly two decades for the mouse to reach the general public. 1st mouse