PC DOS (IBM DOS) A typical command line in PC DOS Developer IBM and Microsoft Written in Assembly language, C OS family DOS Working state No longer supported Source model Closed source Initial release August 1981 (1981-08) Latest release PC DOS 2000 / April 1998 (1998-04) Latest preview PC DOS 7.1 / 2003 (2003) Platforms x86 Kernel type Monolithic kernel Default user interface Command line interface License Commercial proprietary software