Newton

Newton was Apple Computer's first attempt to create a mobile platform for the handheld market. A series of devices were released from 1993 to 1997 by Apple and third-party companies, all running various versions of Newton OS.

Development
The Newton project was begun by Steve Sakoman around 1987 with the support of Apple executives Jean-Louis Gassée and John Sculley. However the scope of the project ballooned out of control with an -sized prototype, codenamed Figaro, which was expected to cost over 6000 by 1992. Sakoman and Gassée left Apple to form Be Inc. Sculley assigned Larry Tesler to salvage the project and Steve Capps was brought in after creating a working mockup in HyperCard. Three models were then planned: a larger 9 x 12 inch version codenamed Senior with a target price of $5000, a mid-sized 6 x 9 inch version with a target price of under $2000 that was quickly cancelled, and a small 4.5 x 7 inch version codenamed Junior with a target price of around $500 which would go on to become the first MessagePad.

Discontinuation
The Newton Systems Group was spun off from Apple Computer on July 1, 1997 into a wholly-owned subsidiary company, Newton, Inc. The MessagePad 2100 was the first and last model to be released under the "Newton Technology" brand. The subsidiary was soon re-absorbed back into Apple after CEO Gil Amelio was fired by the board and Steve Jobs took over as interim CEO. Jobs cancelled the Newton on February 27, 1998, causing fans and developers to protest at the Apple campus in March.

Legacy
Former Apple Newton developers later founded Pixo, the company that created the operating system for the original iPod.

Apple Computer

 * MessagePad (model H1000), also known as "Original MessagePad" or "OMP".
 * MessagePad 100, same specs as "OMP", but with a newer version of Newton OS.
 * MessagePad 110
 * MessagePad 120
 * MessagePad 130
 * eMate 300
 * MessagePad 2000
 * MessagePad 2100
 * MessageSlate (unreleased)

Digital Ocean

 * Seahorse
 * Tarpon

Harris Network Support Systems

 * Harris SuperTech 2000 (based on the MessagePad 130)

Schlumberger

 * Schlumberger Watson

Sharp

 * Sharp ExpertPad PI-7000 (based on the Original MessagePad)
 * Sharp ExpertPad PI-7100 (based on the MessagePad 100)

Siemens

 * Siemens Note Phone
 * Siemens Online Terminal