John Mashey.

I wonder if you have ever come across the Acorn RISCOS mouse and interface system which as far back as the early 1990s had a three button mouse the buttons being left to right Select, Menu, Adjust. This allowed menus to be called up ANYWHERE inside an app’ window with that Menu button and Select used to chose options from the list. If more than one option from the same menu, similarly with dialogue box selections, if one used the Adjust instead the selection would be made but the menu, or dialogue box, stay open for further selections.

Even back in that period of the early 1990s the system had excellent font anti-aliasing using shades of grey and had built in vector graphic Draw and Edit (the latter with excellent search and replace including the control characters) that were way ahead of anything supplied with Windows and its Paint application (all these firmware – in ROM) was also useful.

Almost any mouse these days is vastly better than the ones in the early 1990s, where for every hour spent using the mouse, you spent two hours pulling it apart and cleaning out the fluff and grunge from the ball underneath.

Same OT told me — “with a mouse, you’re “rowing” all the time, using both shoulders, one to move the mouse, the other to move your body in the opposite direction. And you wonder why your shoulders hurt?”

Not quite right. See Engelbart.
The first version of UNIX was 1969, Xerox PARC was already using mice on Alto’s by 1973.

Mice started to come in with microprocessor-based workstations, like Apollo, PERQ, Sun, etc in early 1980s, also Bell Labs BLITs. Some of those Were UNIX.