I was sent this, and...

[OriginalGriff]

Mice in the 90's[^] :-D

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[Amarnath S]

That ball used to gather all the dust on the table, and had to be cleaned frequently.

[trønderen]

And they had to be replaced quite frequently: Mouse ball replacement[^]

[glennPattonWork3]

Saved dusting the desk... :)

[Single Step Debugger]

It was a smart and simple design though.

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[DrWalter PE]

I guess that means the mouse really had large balls!

[trønderen]

Before I switched to optical mice, my mouse had only a single ball. I called him Einstein.

[obermd]

My Logitech trackball has to be popped out periodically and cleaned. The optical sensors get covered in crud just like the old mice roller sensors.

[trønderen]

Using the 'pop off method' then.

[Andreas Mertens]

Also good for those crumbs when you ate at your desk...