Does anyone know where you can still buy the original Logitech type trackball, it was basically a mouse upside down with a funny colour green ball and used rollers instead rather than the modern version with red optical ball the little ball bearings?
I've checked on the Logitech website and they seem to have given up with the original version.
IMO opinion these optical ones get too dirty too quickly and cause control problems. The older one's could be coated in gunk before requiring a good clean but this type it seems to take a day or two before it needs cleaning.
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It's odd that you have problems with optical, though. I don't use trackballs, but the optical mice I've used are vastly superior to the old roller kind. With optical mice, I've found that there is no dirt issue to deal with because there are no moving parts - the old mice used to get their rollers gummed up. Plus, optical mice work on uneven surfaces, where the old rollers really wanted a very smooth surface with a mousepad on top.
I think that is why it is getting more difficult to get the old kind.