Wikipedia
FDOS
FDOS may refer to:
- Floppy Disk Operating System, a term sometimes used to describe early floppy-based disk operating systems such as CP/M
- FDOS, the part of the Basic Disk Operating System (BDOS) implementing the filesystem in Digital Research operating systems such as the CP/M and DR-DOS families
- FreeDOS, a free disk operating system
- FDOS, First Day of Service