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@whitequark I'd have to see more :).

Curious about:

1. How simple it is for a beginner to understand (should be closer to an arduino than to a modern laptop motherboard)?

2. How much I/O does it have to go beyond the board itself (like ~16 3.3V pins on a 2.54" header or worst case PMOD)?

3. Does it have some other fun little thingamajigs on board to play with (buttons, LEDs, an audio DAC, a WS2812B LED, …)?