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this… this could run my Open Book HD. the PIO peripheral seems like it would be perfect for bit-banging a parallel e-paper display. And it replaces 20+ placements with one $4 castellated module. Needless to say I ordered two to play with. https://www.hackster.io/news/hands-on-with-the-rp2040-and-pico-the-first-in-house-silicon-and-microcontroller-from-raspberry-pi-effc452fc25d

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