DOSBox

DOSBox is an open-source emulator that allows you to run software and games designed for the MS-DOS operating system on modern computers. As you probably already know, MS-DOS was a popular operating system used in the 1980s and early 1990s. 
DOSBox emulates the necessary hardware components and provides a DOS-like environment, allowing users to run old DOS-based programs without requiring a dedicated MS-DOS machine. DOSBox itself is operated through a command-line interface, similar to the original MS-DOS.
DOSBox is cross-platform and can be run on various operating systems, including Windows, macOS, Linux, and others.