* PS2++ protocol specs from http://web.archive.org/web/20030714000535/http://dqcs.com/logitech/ps2ppspec.htm ...
The famous Logitech Trackman MarbleFX trackball has four buttons, of which the 4th (red) button was used to emulate a scroll wheel. To enable this, the trackball needs to be switched into a special ...
The Logitech Marble Mouse has an unusual shape for a Logitech device, because it doesn't mimic the hand's natural shape. Long and sleek, the Marble Mouse has a large red trackball at its top and two ...
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