So here's something that's not possible on the PicoGUS 2.0 card, but is on the 1.x cards as well as the Femto: WiFi. Thanks to yyzkevin again, NE2000 emulation is working on the PicoGUS with a Pico-W. It'll still be a while before it's polished: it'll need support from pgusinit to set the SSID and WPA2 password, and I'm also going to start storing card settings in flash so you don't have to run pgusinit all the time.
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