Cadillac The first fully designed prototype was named "Cadillac". Following the first plan it had a nearly letter sized display, a pen navigation and of course handwriting recognition (HWR). This did'nt work that well, but the pen was very precize because it was connected to the PDA by a wire and the pen position was detected by induction (like a lightpen on a normal screen). This, on the other hand, was very expensive and last but not least very clumsy to use. In addition the realy nice case (designed by Guigaro) was the most expensive piece of plastic Apple ever made ($750.000 incl. tools for manufacturing!!). The batterypack alone with its sophisticated snap in design was a designers masterpiece. Cadillac had, in spite of all other Newton models, a roaming function. This means, the infrared beamer was placed on an exposed position slightly higher than the rest of the Cadillac surface and the device was constantly looking for other Newtons around. If another Newton came (or better: was carried) into the same room, they instantly made up a kind of a network excanging data. So one haven't start the communication by hand, like you have to do with the actual Newtons. The Cadillac had one PCMCIA slot, a serial interface, an ADB port and a special multifunction interface whom fuction is now forgotten.   (Cadillac front)  In the upperright corner you see the IR bulb   (Cadillac back)  You can see the IR bulb very well, too   (The left side)  Serial interface, ADB, Pen, Audio & multifunction (SCSI?)   (The batterypack apart)  Mind its "wild" shape   All in all, the Cadillac was way too expensive to produce, even in higher volumes as one ;-) and was killed coldblooded by the board. In addition the pen was considered to improve.