Re: https://firmwaresecurity.com/2017/12/01/nyan-load-and-efi-example/
There’s also a nyan for BIOS, not only the above UEFI one!
NYAN ALL THE MBRs! A 16 bit Nyan cat demo small enough to fit in the master boot record of a disk. BEFORE YOU CONTINUE: USE ON YOUR OWN RISK, PLAYING WITH MBRs IS LIKE PLAYING WITH FIRE. DO NOT BE ON FIRE!