MDOS
# MDOS

MDOS may refer to:

* Micropolis MDOS, an operating system for Z80 S-100 bus machines in the 1970s
* Motorola Disk Operating System for the M6800 based EXORciser development system in the 1970s
* Motorola Disk Operating System, also the underlying basis of the QDOS operating system of the Fairlight CMI digital sampling synthesizer series
* MIDAS (operating system) (originally named MDOS, and also known as M-DOS or My DOS), an 8-bit operating system for 8080/Z80, developed by Microsoft's Marc McDonald in 1979
* Myarc Disk Operating System (aka MDOS), an operating system emulating the TI-99/4A for the Geneve 9640 in 1987
* MS-DOS 4.0 (multitasking), a multitasking operating system
* Multitasking DOS sub-system in IBM OS/2, e.g. C:\OS2\MDOS\
* Multiuser DOS (aka DR MDOS), a DOS- and CP/M compatible 32-bit protected mode operating system for 386 machines developed by Digital Research / Novell in the 1990s
* Multiuser DOS Federation, an industry alliance in the 1990s
