An update for an actual alternative operating system from the good old days of yore. Yes, it still happens. MenuetOS 0.99.98 has been released, with “MediaPlayer demo, Updated 3DS viewer, Midiplayer, FTP”. Here’s some of the settings to help you on your way in VirtualBox, an in case you’r eunfamiliar with MenuetOS:
MenuetOS is a real-time and multiprocessor Operating System in development for the PC written entirely in 32/64 bit assembly language. Menuet64 is released under License and Menuet32 under GPL. Menuet supports 32/64 bit x86 assembly programming for smaller, faster and less resource hungry applications.