According to http://www.oldmouse.com/mouse/xerox/star8010.shtml http://www.oldmouse.com/mouse/xerox/star8010.shtml Xerox had an optical mouse in 1981, I know fo

According to http://www.oldmouse.com/mouse/xerox/star8010.shtml http://www.oldmouse.com/mouse/xerox/star8010.shtml Xerox had an optical mouse in 1981, I know for sure it had one in 1985 because that was when I was using them.