Editing Bus mouse (section)

===Commodore Amiga===
[[Commodore Amiga]] with AmigaOS were shipped with a two-button mouse.
Commodore made a three-button mouse only for the Amiga 3000UX that ran Amiga [[UNIX]] but many third-party Amiga mice also came with middle-button.
On the Amiga, quadrature signals are interpreted by circuitry in its custom chipset, with mouse support for both of its control ports.
A second Amiga mouse is used only in some two-player games, but the second port's circuitry could also be used for rotary controllers such as steering wheels.

In the late 1990s, there appeared third-party Amiga mice with [[scroll wheel]]s and up to five buttons. A special driver and utility are required to use them.
Pin 5, which is analogue-capable (originally for [[Atari interface#Paddles|paddle controllers]]) is used to send this input as varying current.
The third mouse-button is represented differently than earlier.<ref name="micromysv3">Micromys.de—[http://micromys.de/Amiga_devel.htm Micromys support page - Amiga mouse mode with wheel support]. Dated 2000. Retrieved 2019-03-24</ref>