Posted by BruceM on
URL: https://www.es-forum.com/Anyone-else-forced-to-use-an-old-style-ball-mouse-tp4029912p4029926.html

For those who like trackballs (I do), the old CH products Trackball Pro is electronically identical to a mechanical mouse, with a large ball (think billiards cue ball) riding on 1/8" steel shafts, which can be replaced cheaply. Other mechanical trackballs (new ones) do still exist, also.

I modified mine to remove the processor, which I have remoted and shielded, with pi filtered signal lines to the trackball, and the processor optically isolated. So now I have only slowly changing analog signals at the trackball.