Please note: this tutorial is not for beginners. This tutorial requires the use of Raspian terminal commands which are text-based, so you’ll at least need to have basic Linux knowledge. You can’t run actual MS-DOS on the Raspberry Pi as is, instead you will be running DOS via an emulator. By using a combination of QEMU PC emulator and FreeDOS, you can play classic DOS games and run other DOS programs on the Raspberry Pi. Once you’ve set up QEMU as the virtual machine and installed FreeDOS, you can run DOS programs and games on the Raspberry Pi.
Read How to run DOS on a Raspberry Pi OnMSFT.com via OnMSFT.com
An interesting link found among my daily reading