In Pictures: The Apple family tree

Apple platforms through the years

TechStep (1991 to 1993)

CPU class: Motorola 68HC11 OS: TechStep OS Development status: Closed Platform size: 1

This little-known diagnostic tool, which allowed technicians to troubleshoot Mac systems, unintentionally represented Apple’s first handheld mobile computer platform. While most consider this small device an accessory, the TechStep itself contains an embedded computer running specialized software from Apple-provided ROM software packs. No third-party development occurred for this limited diagnostic platform.

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