Trackball on laptop
The very first Macintosh laptop had a trackball, IIRC. Not located below the keyboard, but AFAICR configurable: You could put it to the left or the right of the keyboard, with the keyboard itself moving to the other side. Or replace the trackball with a numeric keypad, if you were into number entry.
But this was ages ago, at least early nineties, perhaps late eighties. Where I lived at the time, Uppsala in Sweden, Macs were pretty darn thin on the ground, and I never saw a portable one. Only read about it in PC Magazine, BYTE, and the like.
Biting the hand that feeds IT
