OSx16 is a command-line system similar to MS-DOS .
DOS '' is used to describe the family of several very similar command-line systems , including MS-DOS , PC DOS , DR-DOS , OSx16 , FreeDOS , ROM-DOS , and PTS-DOS.In spite of the common usage , none of these systems were simply named `` DOS '' ( a name given only to an unrelated IBM mainframe operating system in the 1960s ) .
DOS