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Driving the databus GPIO pins using the VideoCore as a second processor is a really clever hack, especially on the single-core Pi Zero. I guess it's logical that the GPIO can be driven by the GPU in this architecture but I never really thought to do it before.

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Came to say this. I wonder if this hack is widely known, because it seems like this is a pretty clever way to use the Pi Zero in some applications that would be better served with a multi-core processor and don't require the GPU for video tasks. Hacking the Pi Zero to be a dual-core system essentially.

Could four Pi Zeroes become a Pi 3? :)

Clustering the Pi has always been fairly easy [0].

[0] http://www.southampton.ac.uk/~sjc/raspberrypi/

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