LoopLinux - Small Linux OS distribution that can install and run on DOS/Win systems: DR-DOS, MS-DOS, PC-DOS, PTS-DOS, DOS mode Win95/98. No need to repartition, it is only a file on the disk, and acts like it is on its own partition. Not a UMS-DOS system, but a loop - http://www.tux.org/pub/people/kent-robotti/looplinux/