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Because the pi might be needed for more demanding workloads (networks, routing, sdr radio system). With this solution you can build low-tech control systems and programmable switches with a bit of logic where a raspi would be overkill.

But the doomsday scenarios aside, this is super useful as an educational device. It can teach people what computers actually are and how they operate on the lowest possible level.

This is what excites me about this project. Another commenter posted the NandToTetris course, which is along the same lines. Computers/software are so complicated now, so much understanding gets lost in the upper levels of abstraction. Everything just seems like black box magic.

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