designer dark legions
DR - DOS ( DR DOS , without hyphen up to and including version 6 . 0 ) is an operating system of the DOS family , written for ___MASK70___ PC - compatible personal computers . It was originally developed by Gary Kildall ' s Digital Research and derived from Concurrent PC DOS 6 . 0 , which was an advanced successor of CP / M - 86 . As ownership changed , various later versions were produced with names including Novell DOS and Caldera OpenDOS . ___MASK54___ ( born July 14 , 1966 ) is the former president of Canada - based video game developer Silicon Knights , and is a video game designer , writer , director and producer . Dyack directed the production of "" and "", and was inducted into the Canadian Gaming Hall of Fame by the Canadian Game Development Talent Awards in November 2011 . MS - DOS (; acronym for " Microsoft Disk Operating System ") is a discontinued operating system for x86 - based personal computers mostly developed by Microsoft . It was the most commonly used member of the DOS family of operating systems , and was the main operating system for ___MASK70___ PC compatible personal computers during the 1980s and the early ___MASK49___ , when it was gradually superseded by operating systems offering a graphical user interface ( GUI ), in various generations of the graphical Microsoft Windows operating system by Microsoft Corporation . DOS , short for " disk operating system ", is an acronym used to describe the family of several very similar command - line computer operating systems for x86 - based computers : primarily MS - DOS and PC DOS , but also DR - DOS , FreeDOS , ROM - DOS , and PTS - DOS . None of these systems were officially named " DOS ", and indeed " DOS " is a general term for disk operating system . Silicon Knights was a Canadian video game developer . Founded in 1992 by ___MASK54___ , the company was headquartered in St . Catharines , Ontario . In 2012 , following the loss of a court case against Epic Games , Dyack left Silicon Knights to form a new game studio , Precursor Games . The case then led Silicon Knights to multiple lawsuits and eventually to bankruptcy on May 16 , 2014 . Dark Legions is a 1994 action strategy game for DOS . It was developed by Silicon Knights and published by Strategic Simulations , Inc . ( SSI ) . FreeDOS ( formerly Free - DOS and PD - DOS ) is a free operating system for ___MASK70___ PC compatible computers . It intends to provide a complete DOS - compatible environment for running legacy software and supporting embedded systems . x86 is a family of backward compatible instruction set architectures based on the ___MASK6___ 8086 CPU and its ___MASK6___ 8088 variant . The 8086 was introduced in 1978 as a fully 16 - bit extension of ___MASK6___ ' s 8 - bit based 8080 microprocessor , with memory segmentation as a solution for addressing more memory than can be covered by a plain 16 - bit address . The term " x86 " came into being because the names of several successors to ___MASK6___ ' s 8086 processor end in " 86 ", including the 80186 , 80286 , 80386 and 80486 processors .