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DOSBox is a free and open-source emulator which runs software for MS-DOS compatible disk operating systems—primarily video games. [5] It was first released in 2002, when DOS technology was becoming obsolete. Its adoption for running DOS games is widespread, with it being used in commercial re-releases of those games as well.
DOSEMU is an option for people who need or want to continue to use legacy DOS software; in some cases virtualisation is good enough to drive external hardware such as device programmers connected to the parallel port. According to its manual, "dosemu" is a user-level program which uses certain special features of the Linux kernel and the 80386 ...
Virtual DOS machines can operate either exclusively through typical software emulation methods (e.g. dynamic recompilation) or can rely on the virtual 8086 mode of the Intel 80386 processor, which allows real mode 8086 software to run in a controlled environment by catching all operations which involve accessing protected hardware and forwarding them to the normal operating system (as exceptions).
A hardware emulator is an emulator which takes the form of a hardware device. Examples include the DOS-compatible card installed in some 1990s-era Macintosh computers, such as the Centris 610 or Performa 630, that allowed them to run personal computer (PC) software programs and field-programmable gate array-based hardware emulators.
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Villani had already been working on a DOS-like operating system for use in embedded systems for some while before the advent of FreeDOS. [2]His efforts started when he developed an MS-DOS 3.1-compatible interface emulator to write device drivers in the C high-level language instead of in assembly language, [3] as was the usual approach at that time.
Tao ExDOS enables users of DOS applications to work with these applications on new operating systems. Using the built-in Virtual 8086 mode of the x86 CPU, Tao ExDOS enables DOS and 16-bit Windows applications (that run under DOS) to run effectively in 32-bit Windows desktop environments, including Windows 10/8/7/Vista/XP/2000 and Windows Terminal Server 2003/2008. [1]
DOS/32 has been commercially available since 1996. As of May 2002, it was released to the public in the form of "Liberty Edition" along with its complete source code under terms similar to the Apache License of the time, [a] allowing unrestricted, royalty-free distribution with certain provisions regarding reference to it in documentation and the naming of derived software.