This screen allows you to define the mouse, alter the mouse, or disable the mouse for your new Mastodon system. The menu list shows the mouse types that Mastodon supports for the install and the mouse port string is where the mouse is attached to the machine if it is a serial, instead of a PS/2-style (plugged into a mouse port) mouse.

When you define or alter the mouse, the Mastodon installer will attempt to start that mouse. In most cases, this will take a few seconds, but if you tell the system to use a PS/2 style mouse when that type of mouse doesn't actually exist, the install program may hang. If that happens, you can restart your machine without danger.