Microsoft Disk operating system.

MSDOS stands for Microsoft Disk operating system.
MS-DOS is a non-graphical command line 16-bit operating system.
MSDOS created for IBM compatible computers that were first introduced by Microsoft in August 1981.
Last updated in 1994 when MS-DOS 6.22 was released.
The command shell more commonly known as the Windows command line is still used.
MS-DOS does not use a mouse

The command interpreter is integrated in the file COMMAND.com with the internal commands for MS-DOS. The file IO.sys for simple device routines like the access to the monitor, keyboard, fixed storage disks and interfaces. The and MSDOS.sys for the booting code these form the base operating system.

MS-DOS 5.0 use of the High Memory and Upper Memory Area, TSR programs and drivers. The most new external commands in this version are DOSKEY, DOSSHELL, EDIT, EMM386 and LOADHIGH. UNDELETE can recover deleted files, UNFORMAT can undo the format of floppy disks. 2.88 mb floppy disk drives from IBM are now supported.

MSDOS Internal commands

del, erase/delete, rd/rmdir, dir, cd/chdir, cls, md/mkdir, copy, ren/rename, type, set, ver, vol,

MSDOS External commands

attrib, chkdsk, format, fdisk, deltree, diskcopy, diskcomp, edit, doskey, defragment, move, mem, tree, etc.


System environment
- minimum: 512 KB RAM, 5 MB harddisk storage (depends on version for full installation)
- FAT file system
- executable with every x86 compatible CPU
- low RAM and fixed storage disk needs