DOS For IBM PC Compatibles Reserved Device Names DOS For Other

MS-DOS (and the IBM PC-DOS which was licensed therefrom), and its predecessor, QDOS, was a successor to CP/M (Command Processor / (for) Microcomputers)—which was the dominant operating system for 8-bit Intel 8080The Intel 8080 was an early microprocessor designed and manufactured by Intel. The 8-bit CPU was released in April 1974 running at 2 MHz, and is generally considered to be the first truly usable microprocessor CPU design. Description The Intel 8080 was th and Zilog Z80 based microcomputers.

Early versions of Microsoft WindowsImage use policy. Microsoft Windows is a range of commercial operating environments for personal computers. The range was first introduced by Microsoft in 1985 and eventually has come to dominate the world personal computer market. All recent versions of were programs which ran under DOS. Later versions were launched under DOS but "extended" it by going into protected mode. Still later versions of MS Windows ran independently of DOS but included much of the old code such that it could run in virtual machineIn general terms, a virtual machine in computer science is software that creates an environment between the computer platform and the end user in which the end user can operate software. Specifically, the term virtual machine has several distinct meaningss under the new OS and the latest versions of MS Windows are continually dropping ever more of the DOS ancestry. Windows 98 was the last Microsoft OS to run on DOS.

Under LinuxThis article is about Linux-based operating systems, GNU/Linux, and related topics. See Linux kernel for the kernel itself. See Linux (washing powder) for the Swiss brand of washing powder. Tux, a plump penguin, is the official Linux mascot Linux is the n (running on x86x86 or Intel 80x86 is the generic name of a microprocessor architecture first developed and manufactured by Intel. The architecture is called x86 because Intel used to give the earliest processors in this family numeric brand names ending in the sequence-based systems) it's possible to run copies of DOS and many of its clones under dosemu (a Linux native virtual machine program for running real mode programs). There are a number of other emulators for running DOS and/or DOS-based software under various versions of UNIX, even on non-x86 platforms; one such emulator is DOSBox.

1.1 Reserved device names

There are reserved device names in DOS that cannot be used as filenames regardless of extension; these restrictions also affect several Windows versions, in some cases causing crashes and security vulnerabilities.

A partial list of these reserved names is: AUX, COM, COM0, COM1, COM2, ..., COM8, COM9, CON, LPT1, LPT2, NUL, and PRN.

2 DOS for other computers

Prior to (and to some extent concurrently with) the development of the IBM PC compatible family of microcomputers, several other operating systems for other architectures were already known as DOS, notably:

The DOS initial/simple operating system for the IBM System/360 family of mainframe computers (it later became DOS/VSE, and was eventually just called VSE).
The DOS operating system for DEC PDP-11 minicomputers (this OS and the computers it ran on were nearly obsolete by the time PCs became common, with various descendents and other replacements).
The DOS operating system for the Apple Computer's Apple II family of computers. This was the primary operating system for this family from 1979 with the introduction of the floppy disk drive until 1983 with the introduction of ProDOS; many people continued using it long after that date. Usually it was called Apple DOS to distinguish it from MS-DOS.
Commodore DOS, which was used by 8-bit Commodore computers. Unlike most other DOS systems, it was integrated into the disk drives, not loaded into the computer's own memory.

DOS Operating systems

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1 DOS for IBM PC compatibles

1.1 Reserved device names

2 DOS for other computers

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