Microsoft “Intellimouse” teardown from Electronupdate:
Before the advent of optical mice, the go to technology was a steel ball which moved two drive shafts to indicate position.
A good example of this is this Microsoft “Intellimouse”.
As expected the electronics are built around a small micro controller
Check out the video after the break.
from Dangerous Prototypes https://ift.tt/2xmrMR7