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Replying to @Zabbiemeister, @emmafletcher, @MakeAugusta, @CRImierTech and @SD_Robotics

I did do one (ancient!) prototype with a black/white/yellow screen; the problem at the time was that for tri-color e-paper, screen refresh took >10s. Too slow for reading. I even tried pushing faster waveforms for single-color/partial updates. No luck. Unsure if this has changed.

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