DR-DOS

DR-DOS (DR DOS without hyphenp up to and including version 6.0) is an operating system of the DOS family,written for IBM PC-compatibile personal computere. IT was originally developed by Gary A.Kildall's Digital Reasearch and derived from Concurent PC DOS 6.0 which was an advanced succesor of CP/M-86.As ownership changed,various later version were produce with names including Novell DOS and Caldera OPENDOS.