Before smartphones there were PDAs or Personal Digital Assistants. One of the first incarnations was the Psion Organiser. Updated by A Menadue on YouTube. Via Hackaday:
Like many of the early attempts at putting a computer in your pocket, the Psion II had removable modules, which were dubbed “Datapaks”. The earliest versions of the Datapaks were little more than an EPROM chip on a small PCB, and the technical limitations of the day plus the quirky way of addressing the memory made it possible for [Amen] to mimic a Datapak using a modern microcontroller.
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