I think it would be more interesting to take ports found on many computers that aren't being used and turn them into GPIO. There are Ethernet to Serial adapter

I think it would be more interesting to take ports found on many computers that aren't being used and turn them into GPIO. There are Ethernet to Serial adapters [1] [2], I wonder if it could go further. There is also dvi, hdmi, displayport with lots of wires and a chip behind them. Displayport even has " A bi-directional, half-duplex auxiliary channel" [3] , though I'd want to look at the spec to see how that could be used, or if it could be contorted to a GPIO purpose. [1] https://en.wikipedia.org/wiki/PHY_%28chip%29 https://en.wikipedia.org/wiki/PHY_%28chip%29 [2] https://electronics.stackexchange.com/questions/24588/is-there-any-way-to-send-serial-data-over-physical-ethernet-layer-with-no-encaps https://electronics.stackexchange.com/questions/24588/is-the... [3] https://en.wikipedia.org/wiki/DisplayPort https://en.wikipedia.org/wiki/DisplayPort