distribution nitemare 3d
DR - DOS ( DR DOS , without hyphen up to and including version 6 . 0 ) is an operating system of the DOS family , written for IBM PC - compatible personal computers . It was originally developed by Gary Kildall ' s ___MASK28___ 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 . ___MASK89___ is a type of proprietary software which is initially provided free of charge to users , who are allowed and encouraged to make and share copies of the program . ___MASK89___ is often offered as a ___MASK20___ from an Internet website or as a compact disc included with a magazine . ___MASK89___ is available on all major personal computer platforms . The term shareware is used in contrast to open - source software , in which the source code is available for anyone to inspect and alter ; and freeware , which is software distributed at no cost to the user but without source code being made available . The ___MASK53___ is the global system of interconnected computer networks that use the ___MASK53___ protocol suite ( TCP / IP ) to link devices worldwide . It is a " network of networks " that consists of private , public , academic , business , and government networks of local to global scope , linked by a broad array of electronic , wireless , and optical networking technologies . The ___MASK53___ carries an extensive range of information resources and services , such as the inter - linked hypertext documents and applications of the World Wide Web ( WWW ), electronic mail , telephony , and peer - to - peer networks for file sharing . A ___MASK45___ is a collection of related web pages , including multimedia content , typically identified with a common domain name , and published on at least one web server . A ___MASK45___ may be accessible via a public Internet Protocol ( IP ) network , such as the Internet , or a private local area network ( LAN ), by referencing a uniform resource locator ( URL ) that identifies the site . Windows 3 . 1x ( codenamed Janus ) is a series of 16 - ___MASK36___ operating environments produced by Microsoft for use on personal computers . The series began with Windows 3 . 1 , which was first sold during April 1992 as a successor to Windows 3 . 0 . Subsequent versions were released between 1992 and 1994 until the series was superseded by Windows 95 . During its lifespan , Windows 3 . 1 introduced several enhancements to the still MS - DOS - based platform , including improved system stability , expanded support for multimedia , TrueType fonts , and workgroup networking . A ___MASK56___ ( PC ) is a multi - purpose electronic computer whose size , capabilities , and price make it feasible for individual use . PCs are intended to be operated directly by a person using a graphical user interface such as Windows . The versatility of a ___MASK56___ is greatly enhanced by the use of peripheral devices such as a keyboard , monitor , printer , mouse , speakers , and an external hard drive . In computer networks , to ___MASK20___ is to receive data from a remote system , typically a server such as a web server , an FTP server , an email server , or other similar systems . This contrasts with uploading , where data is sent " to " a remote server . A disk operating system ( abbreviated DOS ) is a computer operating system that can use a ___MASK33___ device , such as a ___MASK6___ , ___MASK25___ , or optical disc . A disk operating system must provide a file system for organizing , reading , and writing files on the storage disk . Strictly speaking , this definition does not apply to current generations operating systems , such as versions of Microsoft Windows in use , while this definition is actually only used for older generations of operating systems . Microsoft Corporation ( commonly referred to as Microsoft or MS ) is an American multinational technology company headquartered in Redmond , Washington , that develops , manufactures , licenses , supports and sells computer software , consumer electronics and personal computers and services . Its best known software products are the Microsoft Windows line of operating systems , Microsoft Office office suite , and ___MASK53___ Explorer and Edge web browsers . Its flagship hardware products are the Xbox video game consoles and the Microsoft Surface tablet lineup . As of 2016 , it was the world ' s largest software maker by revenue , and one of the world ' s most valuable companies . x86 is a family of backward compatible instruction set architectures based on the Intel 8086 CPU and its Intel 8088 variant . The 8086 was introduced in 1978 as a fully 16 - ___MASK36___ extension of Intel ' s 8 - ___MASK36___ based 8080 microprocessor , with memory segmentation as a solution for addressing more memory than can be covered by a plain 16 - ___MASK36___ address . The term " x86 " came into being because the names of several successors to Intel ' s 8086 processor end in " 86 ", including the 80186 , 80286 , 80386 and 80486 processors . Nitemare 3D ( N3D ) is a first - person shooter PC game with a horror theme , released by Gray Design Associates in 1994 for MS - DOS and Windows 3 . 1x platforms . It consisted of three episodes with ten levels in each episode , with the first episode being was released as ___MASK89___ . The full release came on two 3 `` floppy disks and was accompanied by a guide to the game ' s thirty levels . The graphics were similar to those used in Wolfenstein 3D or Ken ' s Labyrinth , with perpendicular walls and no textures on the floors or ceilings . The music in Nitemare 3D was composed by David B . Schultz ( also composed for Quiver ) . 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 . ___MASK78___ is proprietary software that is available for use at no monetary cost . In other words , ___MASK78___ may be used without payment but may usually not be modified , re - distributed or reverse - engineered without the author ' s permission . Two historic examples of ___MASK78___ include Skype and Adobe Acrobat Reader . In computing , source code is any collection of computer instructions , possibly with comments , written using a human - readable programming language , usually as ordinary text . The source code of a program is specially designed to facilitate the work of computer programmers , who specify the actions to be performed by a computer mostly by ___MASK76___ source code . The source code is often transformed by an assembler or compiler into binary machine code understood by the computer . The machine code might then be stored for execution at a later time . Alternatively , source code may be interpreted and thus immediately executed .