Usagi is a 3B Raspberry Pi.
The computer is a Raspberry Pi 3B+, with the Pi Foundation 7" ribbon cable monitor(800x480), running the Plan9 operating system. Connected to the computer is a mechanical keyboard, and a Lenovo 3 buttons mouse.
This is the ideal solar workstation aboard Pino as it takes very little power, and the operating system comes with a complete suite of well-documented tools and is independant from the whims of packages and dependencies.