Dude wrote a CPU emulator with all the fixin's to emulate a particular ancient computer. That emulator is compiled then flashed on a microcontroller and then us

Dude wrote a CPU emulator with all the fixin's to emulate a particular ancient computer. That emulator is compiled then flashed on a microcontroller and then uses that emulator to run linux and ultrix which target this particular emulated environment. Also seemingly includes exposing a serial console via USB to allow interacting with the system. It is all a bit inception-y, but no doubt a master work. The images of the PCB have silk screen explaining what happens when you plug it in.