There’s nothing new about mobile computing. In the early ’90s, the industry promised a range of devices, from tablets to mini-laptops to smaller handheld PDAs. Apple’s (AAPL) pioneering offering, the 1993 Newton Message Pad, sought to deliver a sophisticated new operating system and development environment running a unique new platform based upon low-power, ARM RISC processors the company co-developed with Acorn.

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