IBM PC DOS is a DOS system for the IBM Personal
Computer and compatibles, manufactured and sold
by IBM from the 1980s to the 2000s.
Released in March od 1985 PC DOS 3.1 is an
updated version of PC DOS 3.0. PC DOS 3.1 was
the first OS to provide a network support.
PC DOS 3.2 followed in Dcember 1985.