Funny work to store Win 3.1 in Lenovo X200 Bios :
https://sakamoto.pl/weblog/07-windows-3-flash-edition/
https://www.youtube.com/watch?v=g6WYm0BsgNA
Saw it the other day. I think that FreeDOS would have been far more useful than that. Also, he is using Coreboot. You can do a whole bunch of things when you have unrestricted access to the Firmware source code, which is a luxury that BIOS modders don’t have.