An earlier mouse that plugged into an expansion card in the PC. In the 1980s, most mice used a serial connection; however, a bus mouse was occasionally used to free up a serial port for another ...

A mouse that plugs into the serial port on a PC. Serial mice used to be the most common type, but were replaced by mice that use the PS/2 and USB ports. Contrast with bus mouse. See mouse.

Somewhere, and I can't find my source now, I read Disney runs a fleet of over 250 buses in the Orlando area, so a move to hybrids would help the people living there breathe a little easier.