Uploaded October 2025 | Updated September 2026, 3 weeks ago

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This event celebrates the first activation of the very first ARM chip, 40 years previously, at 3pm. We've used a countdown around the one hour mark to make sure to commemorate the event.
Robert Catherall interviews Sophie Wilson, who designed one of the first British home-build microcomputers, the Acorn System 1, and is considered a genius of software engineering.

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Editing by Richard Ecclestone and Lukas West