DOSBox is a freeware and easy-to-use emulator that you can use on any disk operating system compatible with MS-DOS with the primary focus on video games. It is basically a command-line program, and there are two configuration options; modifying a plain text configuration file or through a couple of command-line arguments. The user community has contributed multiple graphical Front Ends for ease of use.
The goal of the project is to be completely compatible with all DOS programs, and it does its best to provide the same experience. The vanilla version doesn’t support long filenames, which means that you will have to use the 8.3 naming convention with up to eight characters before the full stop and close it with a maximum of 4 characters for the file extension.
The official website has multiple versions with support for long filenames, but there is a catch of possible incompatibility with a few older programs. Another great feature of DOSBox is Hardware emulation, and because of this, it has the ability to run DOS programs that require the CPU to be in either protected or real mode.
DOSBox emulation performance is not dependent on the host CPU as it is built to emulate CPU by interpretation. It uses dynamic instruction translation to speed up execution on systems that offer RISC instruction sets like ARM or x86. The use of Simple DirectMedia Layer external library helps it to manage input, graphics, audio devices and build new versions of DOSBox from the source.
DOSBox alternatives