A is different than a ball mouse. A trackball is a device where you roll the ball with your fingers or your thumb.
You're talking about non-optical mice, and yeah, they were a hassle. Their rollers always got gunked-up.
The first optical mouse I ever used was on a SUN workstation back in the early 90s. You had to use a special metal mousepad that was covered in dots that it used to detect motion.
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