[Spktyr]

Even Logitech made (depending on what year) 50-100% of their designs in ADB as well as PS/2, serial, and bus.

In fact, some of those Logitech PC “bus” mice? Yeah, they actually WERE ADB mice. The bus card was an ADB card.

The reality is that you *knew* of few, not that there *were* few.

[RayChuang88]

However, Apple back then didn't really make a point about using more than one mouse button. It wasn't at least well into the 1990's that Apple started to put in multibutton mouse support into MacOS, and of course MacOS X makes extensive use of multibutton mouse operations, hence the reason why Apple introduced the Mighty Mouse mouse pointer in 2005.