CHIP computer.
http://chip.jfpossibilities.com/docs/
https://www.raspberry-pi-geek.com/Archive/2016/19/Exploring-the-tiny-9-C.H.I.P.-computer
https://github.com/getchip/landingpage
https://www.dexterindustries.com/howto/connect-to-chip-headless-mode/
https://jacobsalmela.com/2016/01/03/how-to-set-up-a-headless-and-password-less-c-h-i-p-computer/