picture from the linked github repo, it's an rp2040 wired to an ethernet magjack with some passives on a piece of perfboard in the middle
https://60228.dev/system/media_attachments/files/114/616/988/311/109/944/original/d67ffff1e6664c0d.png
@whitequark no a MAC actually sort of makes sense. i mean a PHY. like this RP2040 project https://github.com/holysnippet/pico_eth_doc
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