In the words of the web site;
MikeOS is a 16-bit operating system for x86 PCs, written in assembly language, which boots from a floppy disk or CD-ROM. It features a text-based dialog-driven user interface, a command-line, support for FAT12 (DOS) floppies and PC speaker sound. It can load external programs and has over 30 system calls. Basic DOS .COM program support is also included.It isn't supposed to be a "general purpose" operating system. Rather, it is a teaching tool with basic functionalities. I think it is cool. It has a good reputation, too. I've downloaded a copy to fool with here at some point in the future.
I think some of you might like this.