DOS on IBM PC compatibles

FreeDOS (formerly Free-DOS and PD-DOS) is a free operating system for IBM PC compatible computers.

DR-DOS (DR DOS, without hyphen up to and including v6.0) is an operating system of the DOS family, written for IBM PC-compatible personal computers.

DOS/4G is a 32-bit DOS extender developed by Rational Systems (now Tenberry Software).

86-DOS is a discontinued operating system developed and marketed by Seattle Computer Products (SCP) for its Intel 8086-based computer kit.

In Memory management, the high memory area (HMA) is the RAM area consisting of 65520 bytes beyond the upper memory area of an IBM AT or compatible computer.

PTS-DOS is a disk operating system, a DOS clone, developed in Russia by PhysTechSoft.

In computer programming, standard streams are preconnected input and output communication channels between a computer program and its environment when it begins execution.

DESQview (DV) was a text mode multitasking operating environment developed by Quarterdeck Office Systems which enjoyed modest popularity in the late 1980s and early 1990s.

A slowdown utility is software designed to reduce the execution speed of other programs.

IO.SYS is an essential part of MS-DOS and Windows 9x.

debug is a command in DOS, OS/2 and Microsoft Windows (only in 32bit) which runs the program debug.

WIN.COM is the executable file used to load versions of Windows that run from DOS.

IBM PC DOS (an acronym for IBM personal computer disk operating system) is a discontinued operating system for the IBM Personal Computer, manufactured and sold by IBM from the 1981 into the 2000s.

COMMAND.COM is the default operating system shell for DOS operating systems and the default command line interpreter on Windows 95, Windows 98 and Windows ME.

DOSBox is an emulator program that emulates an IBM PC compatible computer running a DOS operating system.

Tao ExDOS is an emulator software application designed to allow users of old MS-DOS applications to run these applications on new operating systems such as Windows 10, Windows 8, Windows 7, Windows Vista, Windows XP, Windows 2000 and Windows Terminal Server.

DOS /dɒs/, short for disk operating system, is an acronym for several computer operating systems that are operated by using the command line.

The Multiuser DOS Federation (MDOS) was an industry alliance to promote the growth and acceptance of multi-user DOS-based solutions on 286, 386 and 486 computers.

MS-DOS Editor, commonly just called edit, is a character-based text editor that comes with MS-DOS (since version 5) and 32-bit versions of Microsoft Windows.

MS-DOS (/ˌɛmɛsˈdɒs/ EM-es-DOSS; acronym for Microsoft Disk Operating System) is a discontinued operating system for x86-based personal computers mostly developed by Microsoft.

Double Tools for DoubleSpace is a software utility released in 1993 by the Menlo Park-based company Addstor, Inc.

E is the text editor which was made part of PC DOS with version 6.